Argon

Formula: Ar
Molecular weight: 39.948
IUPAC Standard InChI:
InChI=1S/Ar

Download the identifier in a file.
IUPAC Standard InChIKey: XKRFYHLGVUSROY-UHFFFAOYSA-N
CAS Registry Number: 7440-37-1
Chemical structure:
This structure is also available as a 2d Mol file
Other names: Ar; UN 1006; UN 1951; argon atom
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Information on this page:
Other data available:
- Gas phase thermochemistry data
- Phase change data
- Reaction thermochemistry data: reactions 1 to 50, reactions 51 to 100, reactions 101 to 102
- Henry's Law data
- Gas phase ion energetics data
- Mass spectrum (electron ionization)
- Fluid Properties
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Ion clustering data

Go To: Top, References, Notes

Data compiled as indicated in comments:
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
B - John E. Bartmess
RCD - Robert C. Dunbar

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. Searches may be limited to ion clustering reactions. A general reaction search form is also available.

Clustering reactions

Ar⁺ + Argon = (Ar⁺ Argon )

By formula: Ar⁺ + Ar = (Ar⁺ Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	100. ± 90.	kJ/mol	AVG	N/A	Average of 5 out of 7 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
_rS°	53.6	J/mol*K	PHPMS	Teng and Conway, 1973	gas phase; switching reaction(N2+)Ar; Turner and Conway, 1979, Liu and Conway, 1975; M

(Ar⁺ Argon ) + Argon = (Ar⁺ 2 Argon )

By formula: (Ar⁺ Ar) + Ar = (Ar⁺ 2Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	21.2 ± 0.3	kJ/mol	PHPMS	Turner and Conway, 1979	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	84.9	J/mol*K	PHPMS	Turner and Conway, 1979	gas phase; M

(Ar⁺ 2 Argon ) + Argon = (Ar⁺ 3 Argon )

By formula: (Ar⁺ 2Ar) + Ar = (Ar⁺ 3Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	20. ± 1.	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	72.4	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

Free energy of reaction

_rG° (kJ/mol)	T (K)	Method	Reference	Comment
8.4	77.	PHPMS	Teng and Conway, 1973	gas phase; M

(Ar⁺ 3 Argon ) + Argon = (Ar⁺ 4 Argon )

By formula: (Ar⁺ 3Ar) + Ar = (Ar⁺ 4Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	7.0 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	58.2	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(Ar⁺ 4 Argon ) + Argon = (Ar⁺ 5 Argon )

By formula: (Ar⁺ 4Ar) + Ar = (Ar⁺ 5Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	6.8 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	67.4	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(Ar⁺ 5 Argon ) + Argon = (Ar⁺ 6 Argon )

By formula: (Ar⁺ 5Ar) + Ar = (Ar⁺ 6Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	6.8 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	71.1	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(Ar⁺ 6 Argon ) + Argon = (Ar⁺ 7 Argon )

By formula: (Ar⁺ 6Ar) + Ar = (Ar⁺ 7Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	6.7 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	72.8	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(Ar⁺ 7 Argon ) + Argon = (Ar⁺ 8 Argon )

By formula: (Ar⁺ 7Ar) + Ar = (Ar⁺ 8Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	6.7 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	72.8	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(Ar⁺ 8 Argon ) + Argon = (Ar⁺ 9 Argon )

By formula: (Ar⁺ 8Ar) + Ar = (Ar⁺ 9Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	6.6 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	72.4	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(Ar⁺ 9 Argon ) + Argon = (Ar⁺ 10 Argon )

By formula: (Ar⁺ 9Ar) + Ar = (Ar⁺ 10Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	6.49 ± 0.84	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	71.5	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

(Ar⁺ 10 Argon ) + Argon = (Ar⁺ 11 Argon )

By formula: (Ar⁺ 10Ar) + Ar = (Ar⁺ 11Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	6.5 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	72.8	J/mol*K	PHPMS	Hiraoka and Mori, 1989	gas phase; M

ArNO^- + 2 Argon = Ar₂NO^-

By formula: ArNO^- + 2Ar = Ar₂NO^-

Quantity	Value	Units	Method	Reference	Comment
_rH°	6.28	kJ/mol	N/A	Hendricks, de Clercq, et al., 2002	gas phase; B

Ar₂NO^- + 3 Argon = Ar₃NO^-

By formula: Ar₂NO^- + 3Ar = Ar₃NO^-

Quantity	Value	Units	Method	Reference	Comment
_rH°	5.44	kJ/mol	N/A	Hendricks, de Clercq, et al., 2002	gas phase; B

Ar₃NO^- + 4 Argon = Ar₄NO^-

By formula: Ar₃NO^- + 4Ar = Ar₄NO^-

Quantity	Value	Units	Method	Reference	Comment
_rH°	5.44	kJ/mol	N/A	Hendricks, de Clercq, et al., 2002	gas phase; B

Ar₄NO^- + 5 Argon = Ar₅NO^-

By formula: Ar₄NO^- + 5Ar = Ar₅NO^-

Quantity	Value	Units	Method	Reference	Comment
_rH°	5.44	kJ/mol	N/A	Hendricks, de Clercq, et al., 2002	gas phase; B

Ar₅NO^- + 6 Argon = Ar₆NO^-

By formula: Ar₅NO^- + 6Ar = Ar₆NO^-

Quantity	Value	Units	Method	Reference	Comment
_rH°	5.02	kJ/mol	N/A	Hendricks, de Clercq, et al., 2002	gas phase; B

Ar₆NO^- + 7 Argon = Ar₇NO^-

By formula: Ar₆NO^- + 7Ar = Ar₇NO^-

Quantity	Value	Units	Method	Reference	Comment
_rH°	3.8	kJ/mol	N/A	Hendricks, de Clercq, et al., 2002	gas phase; B

Ar₇NO^- + 8 Argon = Ar₈NO^-

By formula: Ar₇NO^- + 8Ar = Ar₈NO^-

Quantity	Value	Units	Method	Reference	Comment
_rH°	3.8	kJ/mol	N/A	Hendricks, de Clercq, et al., 2002	gas phase; B

Ar₈NO^- + 9 Argon = Ar₉NO^-

By formula: Ar₈NO^- + 9Ar = Ar₉NO^-

Quantity	Value	Units	Method	Reference	Comment
_rH°	2.9	kJ/mol	N/A	Hendricks, de Clercq, et al., 2002	gas phase; B

Ar₉NO^- + 10 Argon = Ar₁₀NO^-

By formula: Ar₉NO^- + 10Ar = Ar₁₀NO^-

Quantity	Value	Units	Method	Reference	Comment
_rH°	2.9	kJ/mol	N/A	Hendricks, de Clercq, et al., 2002	gas phase; B

Ar₁₀NO^- + 11 Argon = Ar₁₁NO^-

By formula: Ar₁₀NO^- + 11Ar = Ar₁₁NO^-

Quantity	Value	Units	Method	Reference	Comment
_rH°	2.5	kJ/mol	N/A	Hendricks, de Clercq, et al., 2002	gas phase; B

Ar₁₁NO^- + 12 Argon = Ar₁₂NO^-

By formula: Ar₁₁NO^- + 12Ar = Ar₁₂NO^-

Quantity	Value	Units	Method	Reference	Comment
_rH°	2.9	kJ/mol	N/A	Hendricks, de Clercq, et al., 2002	gas phase; B

Ar₁₂NO^- + 13 Argon = Ar₁₃NO^-

By formula: Ar₁₂NO^- + 13Ar = Ar₁₃NO^-

Quantity	Value	Units	Method	Reference	Comment
_rH°	1.3	kJ/mol	N/A	Hendricks, de Clercq, et al., 2002	gas phase; B

Ar₁₃NO^- + 14 Argon = Ar₁₄NO^-

By formula: Ar₁₃NO^- + 14Ar = Ar₁₄NO^-

Quantity	Value	Units	Method	Reference	Comment
_rH°	0.84	kJ/mol	N/A	Hendricks, de Clercq, et al., 2002	gas phase; B

+ Argon = ( Argon )

By formula: Br^- + Ar = (Br^- Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	3.3	kJ/mol	Ther	Zhao, Yourshaw, et al., 1994	gas phase; B
_rH°	5.86	kJ/mol	Mobl	Gatland, 1984	gas phase; B,M

+ Argon = ( Argon )

By formula: CH₃⁺ + Ar = (CH₃⁺ Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	47.3 ± 8.4	kJ/mol	PHPMS	Hiraoka, Kudaka, et al., 1991	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	84.1	J/mol*K	PHPMS	Hiraoka, Kudaka, et al., 1991	gas phase; M

( Argon ) + Argon = ( 2 Argon )

By formula: (CH₃⁺ Ar) + Ar = (CH₃⁺ 2Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	9.5 ± 0.8	kJ/mol	PHPMS	Hiraoka, Kudaka, et al., 1991	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	65.7	J/mol*K	PHPMS	Hiraoka, Kudaka, et al., 1991	gas phase; M

( 2 Argon ) + Argon = ( 3 Argon )

By formula: (CH₃⁺ 2Ar) + Ar = (CH₃⁺ 3Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	8.2 ± 0.8	kJ/mol	PHPMS	Hiraoka, Kudaka, et al., 1991	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	93.3	J/mol*K	PHPMS	Hiraoka, Kudaka, et al., 1991	gas phase; M

( 3 Argon ) + Argon = ( 4 Argon )

By formula: (CH₃⁺ 3Ar) + Ar = (CH₃⁺ 4Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	8.2 ± 0.8	kJ/mol	PHPMS	Hiraoka, Kudaka, et al., 1991	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	88.3	J/mol*K	PHPMS	Hiraoka, Kudaka, et al., 1991	gas phase; M

( 4 Argon ) + Argon = ( 5 Argon )

By formula: (CH₃⁺ 4Ar) + Ar = (CH₃⁺ 5Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	8.1 ± 0.8	kJ/mol	PHPMS	Hiraoka, Kudaka, et al., 1991	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	86.2	J/mol*K	PHPMS	Hiraoka, Kudaka, et al., 1991	gas phase; M

( 5 Argon ) + Argon = ( 6 Argon )

By formula: (CH₃⁺ 5Ar) + Ar = (CH₃⁺ 6Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	8. ± 1.	kJ/mol	PHPMS	Hiraoka, Kudaka, et al., 1991	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	87.9	J/mol*K	PHPMS	Hiraoka, Kudaka, et al., 1991	gas phase; M

( 6 Argon ) + Argon = ( 7 Argon )

By formula: (CH₃⁺ 6Ar) + Ar = (CH₃⁺ 7Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	8. ± 2.	kJ/mol	PHPMS	Hiraoka, Kudaka, et al., 1991	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	88.7	J/mol*K	PHPMS	Hiraoka, Kudaka, et al., 1991	gas phase; M

( 7 Argon ) + Argon = ( 8 Argon )

By formula: (CH₃⁺ 7Ar) + Ar = (CH₃⁺ 8Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	8.08	kJ/mol	PHPMS	Hiraoka, Kudaka, et al., 1991	gas phase; Entropy change calculated or estimated; M

CO⁺ + Argon = (CO⁺ Argon )

By formula: CO⁺ + Ar = (CO⁺ Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	67.4 ± 5.9	kJ/mol	PIPECO	Norwood, Guo, et al., 1989	gas phase; CO+(X) ground state; M

+ Argon = ( Argon )

By formula: CO₂⁺ + Ar = (CO₂⁺ Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	25.	kJ/mol	PI	Pratt and Dehmer, 1983	gas phase; M

+ Argon = ( Argon )

By formula: Co⁺ + Ar = (Co⁺ Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	49.4	kJ/mol	PDis	Asher, Bellert, et al., 1994	RCD

+ Argon = ( Argon )

By formula: Cr⁺ + Ar = (Cr⁺ Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	29. ± 2.	kJ/mol	SIDT	Kemper, Hsu, et al., 1991	gas phase; «DELTA»_rH(0 K) = 27.4 kJ/mol, «DELTA»_rS(100 K) = 60.2 J/mol*K; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	66.1	J/mol*K	SIDT	Kemper, Hsu, et al., 1991	gas phase; «DELTA»_rH(0 K) = 27.4 kJ/mol, «DELTA»_rS(100 K) = 60.2 J/mol*K; M

+ Argon = ( Argon )

By formula: Cs⁺ + Ar = (Cs⁺ Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	8.16	kJ/mol	IMob	Gatland, 1984, 2	gas phase; M
_rH°	6.11	kJ/mol	SCATTERING	Gislason, 1984	gas phase; M
_rH°	8.20	kJ/mol	IMob	Viehland, 1984	gas phase; M
_rH°	9.54	kJ/mol	IMob	Takebe, 1983	gas phase; M
_rH°	9.6	kJ/mol	IMob	Takebe, 1983	gas phase; values from this reference are consistently too high; M

D₃⁺ + Argon = (D₃⁺ Argon )

By formula: D₃⁺ + Ar = (D₃⁺ Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	29.1 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	60.7	J/mol*K	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M

(D₃⁺ Argon ) + Argon = (D₃⁺ 2 Argon )

By formula: (D₃⁺ Ar) + Ar = (D₃⁺ 2Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	20.1 ± 0.4	kJ/mol	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	73.2	J/mol*K	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M

(D₃⁺ 2 Argon ) + Argon = (D₃⁺ 3 Argon )

By formula: (D₃⁺ 2Ar) + Ar = (D₃⁺ 3Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	18.6 ± 0.4	kJ/mol	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	77.0	J/mol*K	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M

(D₃⁺ 3 Argon ) + Argon = (D₃⁺ 4 Argon )

By formula: (D₃⁺ 3Ar) + Ar = (D₃⁺ 4Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	10.2 ± 0.4	kJ/mol	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	69.5	J/mol*K	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M

(D₃⁺ 4 Argon ) + Argon = (D₃⁺ 5 Argon )

By formula: (D₃⁺ 4Ar) + Ar = (D₃⁺ 5Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	9.5 ± 0.4	kJ/mol	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	72.8	J/mol*K	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M

(D₃⁺ 5 Argon ) + Argon = (D₃⁺ 6 Argon )

By formula: (D₃⁺ 5Ar) + Ar = (D₃⁺ 6Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	9.1 ± 0.4	kJ/mol	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	79.9	J/mol*K	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M

(D₃⁺ 6 Argon ) + Argon = (D₃⁺ 7 Argon )

By formula: (D₃⁺ 6Ar) + Ar = (D₃⁺ 7Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	6.5 ± 0.4	kJ/mol	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	105.	J/mol*K	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M

+ Argon = ArF^-

By formula: F^- + Ar = ArF^-

Quantity	Value	Units	Method	Reference	Comment
_rH°	8.37	kJ/mol	TDAs	Wada, Kikkawa, et al., 2007	gas phase; Entropy estimated; B
Quantity	Value	Units	Method	Reference	Comment
_rG°	-16.6	kJ/mol	TDAs	Wada, Kikkawa, et al., 2007	gas phase; Entropy estimated; B

+ Argon = ( Argon )

By formula: Fe⁺ + Ar = (Fe⁺ Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	11. ± 7.9	kJ/mol	CIDT	Rodgers and Armentrout, 2000	RCD

+ Argon = ( Argon )

By formula: H₂⁺ + Ar = (H₂⁺ Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	100.	kJ/mol	SIFT	Bedford and Smith, 1990	gas phase; switching reaction(Ar+)Ar, «DELTA»_rH>; M

H₃⁺ + Argon = (H₃⁺ Argon )

By formula: H₃⁺ + Ar = (H₃⁺ Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	28.0 ± 0.8	kJ/mol	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M
_rH°	31. ± 3.	kJ/mol	SIFT	Bedford and Smith, 1990	gas phase; switching reaction(H3+)H2, Hiraoka and Mori, 1989, 2; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	56.1	J/mol*K	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M

(H₃⁺ Argon ) + Argon = (H₃⁺ 2 Argon )

By formula: (H₃⁺ Ar) + Ar = (H₃⁺ 2Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	19.1 ± 0.4	kJ/mol	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	66.9	J/mol*K	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M

(H₃⁺ 2 Argon ) + Argon = (H₃⁺ 3 Argon )

By formula: (H₃⁺ 2Ar) + Ar = (H₃⁺ 3Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	17.9 ± 0.4	kJ/mol	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	72.4	J/mol*K	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M

(H₃⁺ 3 Argon ) + Argon = (H₃⁺ 4 Argon )

By formula: (H₃⁺ 3Ar) + Ar = (H₃⁺ 4Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	10.3 ± 0.4	kJ/mol	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	67.4	J/mol*K	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M

(H₃⁺ 4 Argon ) + Argon = (H₃⁺ 5 Argon )

By formula: (H₃⁺ 4Ar) + Ar = (H₃⁺ 5Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	9.5 ± 0.4	kJ/mol	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	69.9	J/mol*K	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M

(H₃⁺ 5 Argon ) + Argon = (H₃⁺ 6 Argon )

By formula: (H₃⁺ 5Ar) + Ar = (H₃⁺ 6Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	9.1 ± 0.4	kJ/mol	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	78.2	J/mol*K	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M

(H₃⁺ 6 Argon ) + Argon = (H₃⁺ 7 Argon )

By formula: (H₃⁺ 6Ar) + Ar = (H₃⁺ 7Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	6.5 ± 0.4	kJ/mol	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	96.2	J/mol*K	PHPMS	Hiraoka and Mori, 1989, 2	gas phase; M

Hg⁺ + Argon = (Hg⁺ Argon )

By formula: Hg⁺ + Ar = (Hg⁺ Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	22. ± 2.	kJ/mol	PI	Linn, Brom, et al., 1985	gas phase; M

+ Argon = ( Argon )

By formula: I^- + Ar = (I^- Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	2.5	kJ/mol	Ther	Zhao, Yourshaw, et al., 1994	gas phase; B

+ Argon = ( Argon )

By formula: K⁺ + Ar = (K⁺ Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	12. ± 3.	kJ/mol	AVG	N/A	Average of 9 values; Individual data points

Kr⁺ + Argon = (Kr⁺ Argon )

By formula: Kr⁺ + Ar = (Kr⁺ Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	51.0	kJ/mol	PI	Dehmer and Pratt, 1982	gas phase; M
_rH°	56.9	kJ/mol	PI	Ng, Tiedemann, et al., 1977	gas phase; M

+ Argon = ( Argon )

By formula: Li⁺ + Ar = (Li⁺ Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	30. ± 4.	kJ/mol	AVG	N/A	Average of 4 out of 6 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
_rS°	30.	J/mol*K	DT	McKnight and Sawina, 1973	gas phase; «DELTA»_rS approximate; M

Free energy of reaction

_rG° (kJ/mol)	T (K)	Method	Reference	Comment
5.9	294.	IMob	Cassidy and Elford, 1985	gas phase; M
7.9	319.	DT	Keller, Beyer, et al., 1973	gas phase; LOW E/N; M
11.	215.	DT	McKnight and Sawina, 1973	gas phase; «DELTA»_rS approximate; M

+ Argon = ( Argon )

By formula: Mg⁺ + Ar = (Mg⁺ Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	9.6 ± 6.7	kJ/mol	CIDT	Andersen, Muntean, et al., 2000	RCD

N⁺ + Argon = (N⁺ Argon )

By formula: N⁺ + Ar = (N⁺ Ar)

Enthalpy of reaction

_rH° (kJ/mol)	T (K)	Method	Reference	Comment
118. (+44.,-0.)		CID	Haynes, Freysinger, et al., 1995	gas phase; giuded ion beam CID; M

+ Argon = ( Argon )

By formula: NO^- + Ar = (NO^- Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	5.4 ± 3.8	kJ/mol	N/A	Hendricks, de Clercq, et al., 2002	gas phase; B
_rH°	6.7 ± 1.3	kJ/mol	N/A	Bowen and Eaton, 1988	gas phase; B

+ Argon = ( Argon )

By formula: N₂⁺ + Ar = (N₂⁺ Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	112.	kJ/mol	PD/KERD	Kim and Bowers, 1990	gas phase; switching reaction(N2+)N2; Hiraoka and Nakajima, 1988; M
_rH°	106.	kJ/mol	PHPMS	Teng and Conway, 1973	gas phase; switching reaction(N2+)N2; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	81.6	J/mol*K	PD/KERD	Kim and Bowers, 1990	gas phase; switching reaction(N2+)N2; Hiraoka and Nakajima, 1988; M
_rS°	57.3	J/mol*K	PHPMS	Teng and Conway, 1973	gas phase; switching reaction(N2+)N2; M

( Argon ) + Argon = ( 2 Argon )

By formula: (N₂⁺ Ar) + Ar = (N₂⁺ 2Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	16.	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1992	gas phase; «DELTA»_rH>; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	71.	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1992	gas phase; «DELTA»_rH>; M

( 2 Argon ) + Argon = ( 3 Argon )

By formula: (N₂⁺ 2Ar) + Ar = (N₂⁺ 3Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	7.3 ± 0.8	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1992	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	57.3	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1992	gas phase; M

( 3 Argon ) + Argon = ( 4 Argon )

By formula: (N₂⁺ 3Ar) + Ar = (N₂⁺ 4Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	7.0 ± 0.8	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1992	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	74.9	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1992	gas phase; M

( 4 Argon ) + Argon = ( 5 Argon )

By formula: (N₂⁺ 4Ar) + Ar = (N₂⁺ 5Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	6.6 ± 0.8	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1992	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	71.1	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1992	gas phase; M

( 5 Argon ) + Argon = ( 6 Argon )

By formula: (N₂⁺ 5Ar) + Ar = (N₂⁺ 6Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	6.5 ± 0.8	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1992	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	72.8	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1992	gas phase; M

( 6 Argon ) + Argon = ( 7 Argon )

By formula: (N₂⁺ 6Ar) + Ar = (N₂⁺ 7Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	6.4 ± 0.8	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1992	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	72.4	J/mol*K	PHPMS	Hiraoka, Mori, et al., 1992	gas phase; M

( 7 Argon ) + Argon = ( 8 Argon )

By formula: (N₂⁺ 7Ar) + Ar = (N₂⁺ 8Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	6.40	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1992	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	71.	J/mol*K	N/A	Hiraoka, Mori, et al., 1992	gas phase; Entropy change calculated or estimated; M

( 8 Argon ) + Argon = ( 9 Argon )

By formula: (N₂⁺ 8Ar) + Ar = (N₂⁺ 9Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	6.36	kJ/mol	PHPMS	Hiraoka, Mori, et al., 1992	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	71.	J/mol*K	N/A	Hiraoka, Mori, et al., 1992	gas phase; Entropy change calculated or estimated; M

+ Argon = ( Argon )

By formula: Na⁺ + Ar = (Na⁺ Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	15. ± 8.8	kJ/mol	CIDT	Armentrout and Rodgers, 2000	RCD
_rH°	15.5	kJ/mol	SCATTERING	Gislason, 1984	gas phase; M
_rH°	18.4	kJ/mol	IMob	Viehland, 1984	gas phase; M
_rH°	18.	kJ/mol	DT	McKnight and Sawina, 1973	gas phase; M
_rH°	20.4	kJ/mol	IMob	Takebe, 1983	gas phase; M

O^- + Argon = (O^- Argon )

By formula: O^- + Ar = (O^- Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	9.2 ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

(O^- Argon ) + Argon = (O^- 2 Argon )

By formula: (O^- Ar) + Ar = (O^- 2Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	8.4 ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

(O^- 2 Argon ) + Argon = (O^- 3 Argon )

By formula: (O^- 2Ar) + Ar = (O^- 3Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	6.7 ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

(O^- 3 Argon ) + Argon = (O^- 4 Argon )

By formula: (O^- 3Ar) + Ar = (O^- 4Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	5.9 ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

(O^- 4 Argon ) + Argon = (O^- 5 Argon )

By formula: (O^- 4Ar) + Ar = (O^- 5Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	5.0 ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

(O^- 5 Argon ) + Argon = (O^- 6 Argon )

By formula: (O^- 5Ar) + Ar = (O^- 6Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	5.0 ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

(O^- 6 Argon ) + Argon = (O^- 7 Argon )

By formula: (O^- 6Ar) + Ar = (O^- 7Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	4.2 ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

(O^- 7 Argon ) + Argon = (O^- 8 Argon )

By formula: (O^- 7Ar) + Ar = (O^- 8Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	4. ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

(O^- 8 Argon ) + Argon = (O^- 9 Argon )

By formula: (O^- 8Ar) + Ar = (O^- 9Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	4. ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

(O^- 9 Argon ) + Argon = (O^- 10 Argon )

By formula: (O^- 9Ar) + Ar = (O^- 10Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	3. ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

(O^- 10 Argon ) + Argon = (O^- 11 Argon )

By formula: (O^- 10Ar) + Ar = (O^- 11Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	2. ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

(O^- 11 Argon ) + Argon = (O^- 12 Argon )

By formula: (O^- 11Ar) + Ar = (O^- 12Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	3. ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

(O^- 12 Argon ) + Argon = (O^- 13 Argon )

By formula: (O^- 12Ar) + Ar = (O^- 13Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	0.8 ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

(O^- 13 Argon ) + Argon = (O^- 14 Argon )

By formula: (O^- 13Ar) + Ar = (O^- 14Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	0.8 ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

(O^- 14 Argon ) + Argon = (O^- 15 Argon )

By formula: (O^- 14Ar) + Ar = (O^- 15Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	2. ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

(O^- 15 Argon ) + Argon = (O^- 16 Argon )

By formula: (O^- 15Ar) + Ar = (O^- 16Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	0.4 ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

(O^- 16 Argon ) + Argon = (O^- 17 Argon )

By formula: (O^- 16Ar) + Ar = (O^- 17Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	0.4 ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

(O^- 17 Argon ) + Argon = (O^- 18 Argon )

By formula: (O^- 17Ar) + Ar = (O^- 18Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	0.8 ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

(O^- 18 Argon ) + Argon = (O^- 19 Argon )

By formula: (O^- 18Ar) + Ar = (O^- 19Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	0.4 ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

(O^- 19 Argon ) + Argon = (O^- 20 Argon )

By formula: (O^- 19Ar) + Ar = (O^- 20Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	0.4 ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

(O^- 20 Argon ) + Argon = (O^- 21 Argon )

By formula: (O^- 20Ar) + Ar = (O^- 21Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	0.4 ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

(O^- 21 Argon ) + Argon = (O^- 22 Argon )

By formula: (O^- 21Ar) + Ar = (O^- 22Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	0.4 ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

(O^- 22 Argon ) + Argon = (O^- 23 Argon )

By formula: (O^- 22Ar) + Ar = (O^- 23Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	0.4 ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

(O^- 23 Argon ) + Argon = (O^- 24 Argon )

By formula: (O^- 23Ar) + Ar = (O^- 24Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	0.4 ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

(O^- 24 Argon ) + Argon = (O^- 25 Argon )

By formula: (O^- 24Ar) + Ar = (O^- 25Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	0.8 ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

(O^- 25 Argon ) + Argon = (O^- 26 Argon )

By formula: (O^- 25Ar) + Ar = (O^- 26Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	0.8 ± 8.4	kJ/mol	N/A	Arnold, Hendricks, et al., 1995	gas phase; EA given is Vertical Detachment Energy. Affinity: difference between successive EAs in (Y); B

+ Argon = ( Argon )

By formula: O₂^- + Ar = (O₂^- Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	6.95	kJ/mol	N/A	Bowen and Eaton, 1988	gas phase; Bound by 70 meV relative to EA(O2-.); B

+ Argon = ( Argon )

By formula: Rb⁺ + Ar = (Rb⁺ Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	8.49	kJ/mol	IMob	Gatland, 1984, 2	gas phase; M
_rH°	8.28	kJ/mol	IMob	Viehland, 1984	gas phase; M
_rH°	11.9	kJ/mol	IMob	Takebe, 1983	gas phase; M

Xe⁺ + Argon = (Xe⁺ Argon )

By formula: Xe⁺ + Ar = (Xe⁺ Ar)

Quantity	Value	Units	Method	Reference	Comment
_rH°	17.	kJ/mol	PI	Dehmer and Pratt, 1982	gas phase; M
_rH°	25.	kJ/mol	SIFT	Jones, Lister, et al., 1980	gas phase; M
_rH°	13.	kJ/mol	PI	Ng, Tiedemann, et al., 1977	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
_rS°	81.2	J/mol*K	SIFT	Jones, Lister, et al., 1980	gas phase; M

References

Go To: Top, Ion clustering data, Notes

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Teng, H.H.; Conway, D.C., Ion - Molecule Equilibria in Mixtures of N2 and Ar, J. Chem. Phys., 1973, 59, 5, 2316, https://doi.org/10.1063/1.1680338 . [all data]

Turner and Conway, 1979
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Liu and Conway, 1975
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Armentrout and Rodgers, 2000
Armentrout, P.B.; Rodgers, M.T., An Absolute Sodium Cation Affinity Scale: Threshold Collision-Induced Dissociation Experiments and ab Initio Theory, J. Phys. Chem A, 2000, 104, 11, 2238, https://doi.org/10.1021/jp991716n . [all data]

Arnold, Hendricks, et al., 1995
Arnold, S.T.; Hendricks, J.H.; Bowen, K.H., Photoelectron spectroscopy of the solvated anion clusters O-(Ar)(n=1-26,34): Energetics and structure, J. Chem. Phys., 1995, 102, 1, 39, https://doi.org/10.1063/1.469415 . [all data]

Jones, Lister, et al., 1980
Jones, J.D.C.; Lister, D.G.; Twiddy, N.D., Equilibrium Constant for the Reaction Xe+ + 2Ar ---> XeAr+ + Ar in the Temperature Range 150 - 300 K and the Dissociation Energy of XeAr+, Chem. Phys. Lett., 1980, 70, 3, 575, https://doi.org/10.1016/0009-2614(80)80128-X . [all data]

Notes

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Symbols used in this document:

T Temperature

_rG° Free energy of reaction at standard conditions

_rH° Enthalpy of reaction at standard conditions

_rS° Entropy of reaction at standard conditions
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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T	Temperature
_rG°	Free energy of reaction at standard conditions
_rH°	Enthalpy of reaction at standard conditions
_rS°	Entropy of reaction at standard conditions