Argon

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

  
• IUPAC Standard InChIKey: XKRFYHLGVUSROY-UHFFFAOYSA-N Copy
• 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
• Permanent link for this species. Use this link for bookmarking this species for future reference.
• Information on this page:
  • Gas phase ion energetics data
  • Ion clustering data
  • Mass spectrum (electron ionization)
  • References
  • Notes
• 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
  • Fluid Properties
• Data at other public NIST sites:
  • NIST Atomic Spectra Database - Lines Holdings (on physics web site)
  • NIST Atomic Spectra Database - Levels Holdings (on physics web site)
  • NIST Atomic Spectra Database - Ground states and ionization energies (on physics web site)
  • Gas Phase Kinetics Database
  • X-ray Photoelectron Spectroscopy Database, version 5.0
  • X-ray Photoelectron Spectroscopy Database, version 5.0
  • X-ray Photoelectron Spectroscopy Database, version 5.0
  • X-ray Photoelectron Spectroscopy Database, version 5.0
  • X-ray Photoelectron Spectroscopy Database, version 5.0
  • X-ray Photoelectron Spectroscopy Database, version 5.0
  • X-ray Photoelectron Spectroscopy Database, version 5.0
  • X-ray Photoelectron Spectroscopy Database, version 5.0
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Gas phase ion energetics data

Go To: Top, Ion clustering data, Mass spectrum (electron ionization), References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias

Data compiled as indicated in comments:
LL - Sharon G. Lias and Joel F. Liebman
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

Ionization energy determinations

Ion clustering data

Go To: Top, Gas phase ion energetics data, Mass spectrum (electron ionization), References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

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⁺ +  = (Ar⁺ • )

By formula: Ar⁺ + Ar = (Ar⁺ • Ar)

(Ar⁺ • ) +  = (Ar⁺ • 2)

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

(Ar⁺ • 2) +  = (Ar⁺ • 3)

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

Free energy of reaction

(Ar⁺ • 3) +  = (Ar⁺ • 4)

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

(Ar⁺ • 4) +  = (Ar⁺ • 5)

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

(Ar⁺ • 5) +  = (Ar⁺ • 6)

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

(Ar⁺ • 6) +  = (Ar⁺ • 7)

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

(Ar⁺ • 7) +  = (Ar⁺ • 8)

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

(Ar⁺ • 8) +  = (Ar⁺ • 9)

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

(Ar⁺ • 9) +  = (Ar⁺ • 10)

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

(Ar⁺ • 10) +  = (Ar⁺ • 11)

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

ArNO^- + 2 = Ar₂NO^-

By formula: ArNO^- + 2Ar = Ar₂NO^-

Ar₂NO^- + 3 = Ar₃NO^-

By formula: Ar₂NO^- + 3Ar = Ar₃NO^-

Ar₃NO^- + 4 = Ar₄NO^-

By formula: Ar₃NO^- + 4Ar = Ar₄NO^-

Ar₄NO^- + 5 = Ar₅NO^-

By formula: Ar₄NO^- + 5Ar = Ar₅NO^-

Ar₅NO^- + 6 = Ar₆NO^-

By formula: Ar₅NO^- + 6Ar = Ar₆NO^-

Ar₆NO^- + 7 = Ar₇NO^-

By formula: Ar₆NO^- + 7Ar = Ar₇NO^-

Ar₇NO^- + 8 = Ar₈NO^-

By formula: Ar₇NO^- + 8Ar = Ar₈NO^-

Ar₈NO^- + 9 = Ar₉NO^-

By formula: Ar₈NO^- + 9Ar = Ar₉NO^-

Ar₉NO^- + 10 = Ar₁₀NO^-

By formula: Ar₉NO^- + 10Ar = Ar₁₀NO^-

Ar₁₀NO^- + 11 = Ar₁₁NO^-

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

Ar₁₁NO^- + 12 = Ar₁₂NO^-

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

Ar₁₂NO^- + 13 = Ar₁₃NO^-

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

Ar₁₃NO^- + 14 = Ar₁₄NO^-

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

 +  = ( • )

By formula: Br^- + Ar = (Br^- • Ar)

 +  = ( • )

By formula: CH₃⁺ + Ar = (CH₃⁺ • Ar)

( • ) +  = ( • 2)

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

( • 2) +  = ( • 3)

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

( • 3) +  = ( • 4)

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

( • 4) +  = ( • 5)

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

( • 5) +  = ( • 6)

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

( • 6) +  = ( • 7)

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

( • 7) +  = ( • 8)

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

CO⁺ +  = (CO⁺ • )

By formula: CO⁺ + Ar = (CO⁺ • Ar)

 +  = ( • )

By formula: CO₂⁺ + Ar = (CO₂⁺ • Ar)

 +  = ( • )

By formula: Co⁺ + Ar = (Co⁺ • Ar)

 +  = ( • )

By formula: Cr⁺ + Ar = (Cr⁺ • Ar)

 +  = ( • )

By formula: Cs⁺ + Ar = (Cs⁺ • Ar)

D₃⁺ +  = (D₃⁺ • )

By formula: D₃⁺ + Ar = (D₃⁺ • Ar)

(D₃⁺ • ) +  = (D₃⁺ • 2)

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

(D₃⁺ • 2) +  = (D₃⁺ • 3)

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

(D₃⁺ • 3) +  = (D₃⁺ • 4)

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

(D₃⁺ • 4) +  = (D₃⁺ • 5)

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

(D₃⁺ • 5) +  = (D₃⁺ • 6)

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

(D₃⁺ • 6) +  = (D₃⁺ • 7)

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

 +  = ArF^-

By formula: F^- + Ar = ArF^-

 +  = ( • )

By formula: Fe⁺ + Ar = (Fe⁺ • Ar)

 +  = ( • )

By formula: H₂⁺ + Ar = (H₂⁺ • Ar)

H₃⁺ +  = (H₃⁺ • )

By formula: H₃⁺ + Ar = (H₃⁺ • Ar)

(H₃⁺ • ) +  = (H₃⁺ • 2)

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

(H₃⁺ • 2) +  = (H₃⁺ • 3)

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

(H₃⁺ • 3) +  = (H₃⁺ • 4)

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

(H₃⁺ • 4) +  = (H₃⁺ • 5)

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

(H₃⁺ • 5) +  = (H₃⁺ • 6)

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

(H₃⁺ • 6) +  = (H₃⁺ • 7)

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

Hg⁺ +  = (Hg⁺ • )

By formula: Hg⁺ + Ar = (Hg⁺ • Ar)

 +  = ( • )

By formula: I^- + Ar = (I^- • Ar)

 +  = ( • )

By formula: K⁺ + Ar = (K⁺ • Ar)

Kr⁺ +  = (Kr⁺ • )

By formula: Kr⁺ + Ar = (Kr⁺ • Ar)

 +  = ( • )

By formula: Li⁺ + Ar = (Li⁺ • Ar)

Free energy of reaction

 +  = ( • )

By formula: Mg⁺ + Ar = (Mg⁺ • Ar)

N⁺ +  = (N⁺ • )

By formula: N⁺ + Ar = (N⁺ • Ar)

Enthalpy of reaction

 +  = ( • )

By formula: NO^- + Ar = (NO^- • Ar)

 +  = ( • )

By formula: N₂⁺ + Ar = (N₂⁺ • Ar)

( • ) +  = ( • 2)

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

( • 2) +  = ( • 3)

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

( • 3) +  = ( • 4)

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

( • 4) +  = ( • 5)

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

( • 5) +  = ( • 6)

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

( • 6) +  = ( • 7)

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

( • 7) +  = ( • 8)

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

( • 8) +  = ( • 9)

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

 +  = ( • )

By formula: Na⁺ + Ar = (Na⁺ • Ar)

O^- +  = (O^- • )

By formula: O^- + Ar = (O^- • Ar)

(O^- • ) +  = (O^- • 2)

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

(O^- • 2) +  = (O^- • 3)

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

(O^- • 3) +  = (O^- • 4)

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

(O^- • 4) +  = (O^- • 5)

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

(O^- • 5) +  = (O^- • 6)

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

(O^- • 6) +  = (O^- • 7)

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

(O^- • 7) +  = (O^- • 8)

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

(O^- • 8) +  = (O^- • 9)

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

(O^- • 9) +  = (O^- • 10)

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

(O^- • 10) +  = (O^- • 11)

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

(O^- • 11) +  = (O^- • 12)

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

(O^- • 12) +  = (O^- • 13)

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

(O^- • 13) +  = (O^- • 14)

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

(O^- • 14) +  = (O^- • 15)

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

(O^- • 15) +  = (O^- • 16)

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

(O^- • 16) +  = (O^- • 17)

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

(O^- • 17) +  = (O^- • 18)

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

(O^- • 18) +  = (O^- • 19)

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

(O^- • 19) +  = (O^- • 20)

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

(O^- • 20) +  = (O^- • 21)

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

(O^- • 21) +  = (O^- • 22)

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

(O^- • 22) +  = (O^- • 23)

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

(O^- • 23) +  = (O^- • 24)

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

(O^- • 24) +  = (O^- • 25)

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

(O^- • 25) +  = (O^- • 26)

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

 +  = ( • )

By formula: O₂^- + Ar = (O₂^- • Ar)

 +  = ( • )

By formula: Rb⁺ + Ar = (Rb⁺ • Ar)

Xe⁺ +  = (Xe⁺ • )

By formula: Xe⁺ + Ar = (Xe⁺ • Ar)

Mass spectrum (electron ionization)

Go To: Top, Gas phase ion energetics data, Ion clustering data, References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director

Spectrum

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Additional Data

References

Go To: Top, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Hunter and Lias, 1998
Hunter, E.P.; Lias, S.G., Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update, J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018 . [all data]

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Wetzel, R.C.; Baiocchi, F.A.; Hayes, T.R.; Freund, R.S., Absolute cross sections for electron-impact ionization of the rare-gas atoms by the fast-neutral-beam method, Phys. Rev. A, 1987, 35, 559. [all data]

Kelly, 1987
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Kimura, K.; Katsumata, S.; Achiba, Y.; Yamazaki, T.; Iwata, S., Ionization energies, Ab initio assignments, and valence electronic structure for 200 molecules in Handbook of HeI Photoelectron Spectra of Fundamental Organic Compounds, Japan Scientific Soc. Press, Tokyo, 1981. [all data]

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Clare, P.; Sowerby, D.B., Electron impact ionisation energies of some halo-cyclotriphosphazenes, J. Inorg. Nucl. Chem., 1981, 43, 477. [all data]

Freiser, 1980
Freiser, B.S., Electron impact ionization of argon ions by trapped ion cyclotron resonanace spectroscopy, Int. J. Mass Spectrom. Ion Phys., 1980, 33, 263. [all data]

Minnhagen, 1973
Minnhagen, L., Spectrum and the energy levels of neutral argon, Ar I, J. Opt. Soc. Am., 1973, 63, 1185. [all data]

Spohr, Guyon, et al., 1971
Spohr, R.; Guyon, P.M.; Chupka, W.A.; Berkowitz, J., Threshold photoelectron detector for use in the vacuum ultraviolet, Rev. Sci. Instrum., 1971, 42, 1872. [all data]

Yoshino, 1970
Yoshino, K., Absorption spectrum of the argon atom in the vacuum-ultraviolet region, J. Opt. Soc. Am., 1970, 60, 1220. [all data]

Yoshino, 1969
Yoshino, K., Absorption spectrum of the argon atom in the vacuum-ultraviolet region, J. Opt. Soc. Am., 1969, 59, 1525. [all data]

Hotop and Niehaus, 1969
Hotop, H.; Niehaus, A., Reactions of excited atoms molecules with atoms and molecules. II. Energy analysis of penning electrons, Z. Phys., 1969, 228, 68. [all data]

Collin and Natalis, 1968
Collin, J.E.; Natalis, P., Vibrational and electronic ionic states of nitric oxide. An accurate method for measuring ionization potentials by photoelectron spectroscopy, Intern. J. Mass Spectrom. Ion Phys., 1968, 1, 483. [all data]

Gallegos and Klaver, 1967
Gallegos, E.J.; Klaver, R.F., Automatic voltage scanner for a peak switching mass spectrometer, J.Sci. Instr., 1967, 44, 427. [all data]

Winters, Collins, et al., 1966
Winters, R.E.; Collins, J.H.; Courchene, W.L., Resolution of fine structure in ionization-efficiency curves, J. Chem. Phys., 1966, 45, 1931. [all data]

Al-Joboury and Turner, 1963
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Teng and Conway, 1973
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
Turner, D.L.; Conway, D.C., Study of the 2Ar + Ar2+ = Ar + Ar3+ Reaction, J. Chem. Phys., 1979, 71, 4, 1899, https://doi.org/10.1063/1.438544 . [all data]

Liu and Conway, 1975
Liu, W.F.; Conway, D.C., Ion - Molecule Reactions in Ar at 296, 195, and 77 K, J. Chem. Phys., 1975, 62, 8, 3070, https://doi.org/10.1063/1.430906 . [all data]

Hiraoka and Mori, 1989
Hiraoka, K.; Mori, T., Formation and Stabilities of Cluster Ions Arn+, J. Chem. Phys., 1989, 90, 12, 7143, https://doi.org/10.1063/1.456245 . [all data]

Hendricks, de Clercq, et al., 2002
Hendricks, J.H.; de Clercq, H.L.; Freidhoff, C.B.; Arnold, S.T.; Eaton, J.G.; Fancher, C.; Lyapustina, S.A.; S., Anion solvation at the microscopic level: Photoelectron spectroscopy of the solvated anion clusters, NO-(Y)(n), where Y=Ar, Kr, Xe, N2O, H2S, NH3, H2O, and C2H4(OH)(2), J. Chem. Phys., 2002, 116, 18, 7926-7938, https://doi.org/10.1063/1.1457444 . [all data]

Zhao, Yourshaw, et al., 1994
Zhao, Y.X.; Yourshaw, I.; Reiser, G.; Arnold, C.C.; Neumark, D.M., Study of the ArBr(-), ArI(-), and KrI(-) anions and the corresponding neutral van der Waals complexes by anion zero electron kinetic energy, J. Chem. Phys., 1994, 101, 8, 6538, https://doi.org/10.1063/1.468500 . [all data]

Gatland, 1984
Gatland, I.R., Determination of Ion-Atom Potentials from Mobility Experiments. in Swarms of Ions and Electrons In Gases, W. Lindinger, Ed., Springer-Verlag, NY,, 1984, 44. [all data]

Hiraoka, Kudaka, et al., 1991
Hiraoka, K.; Kudaka, I.; Yamabe, S., A Charge-Transfer Complex CH3+ Ar in the Gas Phase, Chem. Phys. Lett., 1991, 178, 1, 103, https://doi.org/10.1016/0009-2614(91)85060-A . [all data]

Norwood, Guo, et al., 1989
Norwood, K.; Guo, J.H.; Luo, G.; Ng, C.Y., A Study of Intramolecular Charge Transfer in Mixed Ar/Co Dimer and Trimer Ions Using the Photoion - Photoelectron Coincidence Method, Chem. Phys., 1989, 129, 1, 109, https://doi.org/10.1016/0301-0104(89)80023-0 . [all data]

Pratt and Dehmer, 1983
Pratt, S.T.; Dehmer, P.M., On the Dissociation Energy of ArCO2+, J. Chem. Phys., 1983, 78, 10, 6336, https://doi.org/10.1063/1.444561 . [all data]

Asher, Bellert, et al., 1994
Asher, R.L.; Bellert, D.; Buthelezi, T.; Brucat, P.J., The Bond Strength of Ni2+, Chem. Phys. Lett., 1994, 224, 5-6, 529, https://doi.org/10.1016/0009-2614(94)00574-5 . [all data]

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