Phosphorus dimer

Formula: P₂
Molecular weight: 61.947524
IUPAC Standard InChI: InChI=1S/P2/c1-2
IUPAC Standard InChIKey: FOBPTJZYDGNHLR-UHFFFAOYSA-N
CAS Registry Number: 12185-09-0
Chemical structure:
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Gas phase thermochemistry data

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Quantity	Value	Units	Method	Reference	Comment
Δ_fH°_gas	144.0 ± 2.0	kJ/mol	Review	Cox, Wagman, et al., 1984	CODATA Review value
Δ_fH°_gas	143.65	kJ/mol	Review	Chase, 1998	Data last reviewed in June, 1961
Quantity	Value	Units	Method	Reference	Comment
S°_{gas,1 bar}	218.123 ± 0.004	J/mol*K	Review	Cox, Wagman, et al., 1984	CODATA Review value
S°_{gas,1 bar}	218.07	J/mol*K	Review	Chase, 1998	Data last reviewed in June, 1961

Gas Phase Heat Capacity (Shomate Equation)

C_p° = A + B*t + C*t² + D*t³ + E/t²
H° − H°_298.15= A*t + B*t²/2 + C*t³/3 + D*t⁴/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t²/2 + D*t³/3 − E/(2*t²) + G
C_p = heat capacity (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.

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View table.

Temperature (K)	298. to 6000.
A	35.92198
B	1.483806
C	-0.339811
D	0.028919
E	-0.401919
F	131.5232
G	258.8557
H	143.6530
Reference	Chase, 1998
Comment	Data last reviewed in June, 1961

Reaction thermochemistry data

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Data compiled by: John E. Bartmess

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Individual Reactions

(CAS Reg. No. 141171-05-3 • 4294967295 Phosphorus dimer ) + = CAS Reg. No. 141171-05-3

By formula: (CAS Reg. No. 141171-05-3 • 4294967295P₂) + P₂ = CAS Reg. No. 141171-05-3

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	208. ± 32.	kJ/mol	Ther	O'Hair, Krempp, et al., 1992	gas phase; Acidity between MeNO2, tBuSH
Δ_rH°	213. ± 21.	kJ/mol	IMRB	O'Hair, Krempp, et al., 1992	gas phase; Hydride affinity: between CO2, SO2

(CAS Reg. No. 141171-04-2 • 4294967295 Phosphorus dimer ) + = CAS Reg. No. 141171-04-2

By formula: (CAS Reg. No. 141171-04-2 • 4294967295P₂) + P₂ = CAS Reg. No. 141171-04-2

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	144. ± 10.	kJ/mol	IMRB	O'Hair, Krempp, et al., 1992	gas phase; Fluoride affinity: Between H2S, MeSH
Δ_rH°	138. ± 34.	kJ/mol	Ther	O'Hair, Krempp, et al., 1992	gas phase; Acidity between MeSH, H2S

Gas phase ion energetics data

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Data evaluated as indicated in comments:
L - Sharon G. Lias

Data compiled as indicated in comments:
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
B - John E. Bartmess

View reactions leading to P₂⁺ (ion structure unspecified)

Quantity	Value	Units	Method	Reference	Comment
IE (evaluated)	10.53	eV	N/A	N/A	L

Electron affinity determinations

EA (eV)	Method	Reference	Comment
0.630 ± 0.050	LPES	Jones, Ganteför, et al., 1995	Vertical Detachment Energy: 0.68±0.05 eV; B
0.589 ± 0.025	LPES	Snodgrass, Coe, et al., 1985	B
<0.649985	PD	Feldman, Rackwitz, et al., 1977	B
0.24 ± 0.23	EIAE	Bennett, Margrave, et al., 1974	From P₄; B

Ionization energy determinations

IE (eV)	Method	Reference	Comment
11.7 ± 0.5	EI	Balducci, Gigli, et al., 1981	LLK
10.53	EVAL	Huber and Herzberg, 1979	LLK
10.567 ± 0.002	S	Carroll and Mitchell, 1975	LLK
10.3 ± 0.5	EI	Gingerich, Cocke, et al., 1974	LLK
9.7	EI	Drowart, Myers, et al., 1973	LLK
10.60	PE	Potts, Glenn, et al., 1972	LLK
9.7 ± 0.5	EI	Smoes, Myers, et al., 1971	LLK
11.2	EI	Gingerich and Piacente, 1971	LLK
10.7 ± 0.1	S	Donovan and Strachan, 1971	LLK
11.0 ± 0.3	EI	DeMaria, Gingerich, et al., 1968	RDSH
9.6 ± 0.3	EI	Carlson, Kohl, et al., 1968	RDSH
11.8 ± 0.5	EI	Gutbier, 1961	RDSH
10.62 ± 0.01	PE	Bulgin, Dyke, et al., 1976	Vertical value; LLK
10.84	PE	Potts, Glenn, et al., 1972	Vertical value; LLK

Appearance energy determinations

Ion	AE (eV)	Other Products	Method	Reference	Comment
P⁺	15.9	P	EI	Gingerich and Piacente, 1971	LLK
P⁺	15.1 ± 0.3	P	EI	DeMaria, Gingerich, et al., 1968	RDSH

Constants of diatomic molecules

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Data compiled by: Klaus P. Huber and Gerhard H. Herzberg

Data collected through May, 1977

Symbols used in the table of constants
Symbol	Meaning
State	electronic state and / or symmetry symbol
T_e	minimum electronic energy (cm^-1)
ω_e	vibrational constant – first term (cm^-1)
ω_ex_e	vibrational constant – second term (cm^-1)
ω_ey_e	vibrational constant – third term (cm^-1)
B_e	rotational constant in equilibrium position (cm^-1)
α_e	rotational constant – first term (cm^-1)
γ_e	rotation-vibration interaction constant (cm^-1)
D_e	centrifugal distortion constant (cm^-1)
β_e	rotational constant – first term, centrifugal force (cm^-1)
r_e	internuclear distance (Å)
Trans.	observed transition(s) corresponding to electronic state
ν₀₀	position of 0-0 band (units noted in table)

Diatomic constants for ³¹P₂
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
Carroll and Mitchell's Rydberg series V_n converging to F ²Σ_u⁺(v=0):
... 4σ_u 5σ_g² 2π_u⁴ nsσ_g 1	v=125225 - R/(n-1.86)², n=5(v₅),6...16. Similar series with v'=1.
... 4σ_u 5σ_g² 2π_u⁴ nsσ_g 1	↳Carroll and Mitchell, 1975
V₅ (¹Σ_u⁺)	114085	[789]									V₅ ← X	114090
V₅ (¹Σ_u⁺)	↳Carroll and Mitchell, 1975
... 4σ_u² 5σ_g 2π_u⁴	2
... 4σ_u² 5σ_g 2π_u⁴	↳missing citation
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
... 4σ_u² 5σ_g 2π_u⁴ nfπ_u	3
... 4σ_u² 5σ_g 2π_u⁴ nfπ_u	↳missing citation
... 4σ_u² 5σ_g 2π_u⁴ nfσ_u	4
... 4σ_u² 5σ_g 2π_u⁴ nfσ_u	↳missing citation
... 4σ_u² 5σ_g 2π_u⁴ npπ_u	5
... 4σ_u² 5σ_g 2π_u⁴ npπ_u	↳missing citation
... 4σ_u² 5σ_g 2π_u⁴ npσ_u	6
... 4σ_u² 5σ_g 2π_u⁴ npσ_u	↳missing citation
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
... 4σ_u² 5σ_g² 2π_u³	7
... 4σ_u² 5σ_g² 2π_u³	↳missing citation
... 4σ_u² 5σ_g² 2π_u³ ndδ_g ?	8
... 4σ_u² 5σ_g² 2π_u³ ndδ_g ?	↳missing citation
... 4σ_u² 5σ_g² 2π_u³ ndπ_g	9
... 4σ_u² 5σ_g² 2π_u³ ndπ_g	↳missing citation
... 4σ_u² 5σ_g² 2π_u³ ndσ_g	10
... 4σ_u² 5σ_g² 2π_u³ ndσ_g	↳missing citation
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
... 4σ_u² 5σ_g² 2π_u³ nsσ_g	11
... 4σ_u² 5σ_g² 2π_u³ nsσ_g	↳missing citation
Unclassified bands 79700 - 84500 cm^-1.
↳Carroll and Mitchell, 1975
U	83362	[551] H 12									U ← X R	83248 H
U	↳missing citation
G₆ (¹Σ_u⁺)	81327	[723] 13									G₆ ← X R	81299 H
G₆ (¹Σ_u⁺)	↳Creutzberg, 1966; Carroll and Mitchell, 1975
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
T	80992	[713.1] H 14									T ← X R	80958.5 H
T	↳Creutzberg, 1966; missing citation
S ¹Σ_u⁺	(80840)				B₁=0.2783					r₁=1.978	S ← X R	81453.89 15 Z
S ¹Σ_u⁺	↳Creutzberg, 1966; Carroll and Mitchell, 1975
R₄ (¹Π_u)	80115	[740] 16									R₄ ← X	80095
R₄ (¹Π_u)	↳Carroll and Mitchell, 1975
Q (¹Π_u)	(79860)	[617.6] H 17									Q ← X R	79779.5₃ H
Q (¹Π_u)	↳Creutzberg, 1966; Carroll and Mitchell, 1975
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
P₄ (¹Σ_u⁺)	(79827) 18										P₄ ← X	79804
P₄ (¹Σ_u⁺)	↳Carroll and Mitchell, 1975
M₄ (¹Σ_u⁺)	(78271)	(705)	(5) 19								M₄ ← X R	(78233) 20
M₄ (¹Σ_u⁺)	↳Carroll and Mitchell, 1975
H₅ (¹Π_u)	(78256) 21										H₅ ← X	78233
H₅ (¹Π_u)	↳Carroll and Mitchell, 1975
K₄ (¹Π_u)	(77968)	[732] 13									K₄ ← X	77944
K₄ (¹Π_u)	↳Carroll and Mitchell, 1975
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
O	77475	529 H	2								O ← X R	77349 H
O	↳missing citation
N ¹Σ_u⁺	77286.₇	[641.76] Z	(29.7)		0.2984 22	0.0050₄		[3.1E-7]		1.909₉	N ← X R	77240.2₃ Z
N ¹Σ_u⁺	↳Creutzberg, 1966; Carroll and Mitchell, 1975
L (¹Π_u)	73593	[672.2] H									L ← X R	73539.3 H
L (¹Π_u)	↳Creutzberg, 1966; Carroll and Mitchell, 1975
E₅ (¹Π_u)	73385	685 H	2.₇								E₅ ← X R	73337
E₅ (¹Π_u)	↳Carroll and Mitchell, 1975
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
M ¹Σ_u⁺	73168.0	684.0 23 H	2.9₇		0.2802 23	0.0016				1.971	M ← X R	73119.6 23 H
M ¹Σ_u⁺	↳Creutzberg, 1966; Carroll and Mitchell, 1975
K ¹Π_u	72288	[701.7] H^Q	(5)		[0.2704] 24 22					[2.006]	K ← X R	72253.3 Z
K ¹Π_u	↳Creutzberg, 1966; Carroll and Mitchell, 1975
Numerous diffuse irregularly spaced "lines" 69900 - 70400 cm^-1, no assignments.
↳Creutzberg, 1966
H (¹Π_u)	(68960) 25										H ← X	68940
H (¹Π_u)	↳Creutzberg, 1966; Carroll and Mitchell, 1975
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
I ¹Π_u	[68849.3]				[0.2541]			[2.₅E-7]		[2.070]	I ← X R	68459.6₃ Z
I ¹Π_u	↳Creutzberg, 1966
G ¹Σ_u⁺	66313.37	694.12 Z	4.18₂		0.29730 22	0.00195		[2.25E-7]		1.9135	G ↔ X R	66269.71 Z
G ¹Σ_u⁺	↳Dressler, 1955; missing citation
E ¹Π_u	59446.21	700.66 H^Q	2.92		[0.2807₂] 22			[1.84E-7]		[1.969₂]	E ↔ X 26 R	59406.14 Z
E ¹Π_u	↳Dressler, 1955; missing citation
B ¹Π_u	50845.9	[358.96] 27 Z	28		[0.2268] 27	29		[3.2E-7]		[2.191]	B → A R	16203.7₁ 27 Z
B ¹Π_u	↳Malicet, Brion, et al., 1973; missing citation
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
c ³Π_u2	47176.8	393.67 Z	3.849 30	-.0915	0.2190 31	0.0024		2.5E-7		2.229	c → b 32 R	18721.5 Z
c ³Π_u2	↳Brion, da Paz, et al., 1971; missing citation; Carroll and Nulty, 1976; missing citation
c ³Π_u1	47159.1	393.67 Z	3.849 30	-.0915	0.2190 31	0.0024		2.5E-7		2.229	c → b 32 R	18836.4 Z
c ³Π_u1	↳Brion, da Paz, et al., 1971; missing citation; Carroll and Nulty, 1976; missing citation
c ³Π_u0	47139.2	393.67 Z	3.849 30	-.0915	0.2190 31	0.0024		2.5E-7		2.229	c → b 32 R	18944.6 Z
c ³Π_u0	↳Brion, da Paz, et al., 1971; missing citation; Carroll and Nulty, 1976; missing citation
C ¹Σ_u⁺	46941.26	473.93 Z	2.340 33	0.0066	0.24211 34 22	0.00175	3.₃E-6	2.57E-7		2.1204	C ↔ X R	46787.97 Z
C ¹Σ_u⁺	↳missing citation; missing citation; Marais and Verleger, 1950; Creutzberg, 1966; missing citation; missing citation
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
A ¹Π_g	34515.25	618.95 Z	3.00		0.27524	0.00168		2.2E-7		1.9887	A → X R	34434.30 Z
A ¹Π_g	↳missing citation; Verma and Broida, 1970; Malicet, Brion, et al., 1973; missing citation
b ²Π_g2	28329.6	644.66 Z	3.213 35		0.2805	0.00178		2.0E-7		1.970	b → a 32 V	9574.8 Z
b ²Π_g2	↳Mrozowski and Santaram, 1967; Brion and Malicet, 1975; missing citation; Carroll and Nulty, 1976
b ²Π_g1	28197.0	644.66 Z	3.213 35		0.2805	0.00178		2.0E-7		1.970	b → a 32 V	9442.2 Z
b ²Π_g1	↳Mrozowski and Santaram, 1967; Brion and Malicet, 1975; missing citation; Carroll and Nulty, 1976
b ²Π_g0	28068.9	644.66 Z	3.213 35		0.2805	0.00178		2.0E-7		1.970	b → a 32 V	9314.1 Z
b ²Π_g0	↳Mrozowski and Santaram, 1967; Brion and Malicet, 1975; missing citation; Carroll and Nulty, 1976
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
b' ³Σ_u^-	28503.4 36	604.4₈ Z	2.2		0.2584 37	0.0014		1.7E-7		2.052	b' → X R	28415.4 Z
b' ³Σ_u^-	↳Mrozowski and Santaram, 1967; missing citation
a ³Σ⁺	18794.5	565.1₇ H	2.7₅		B₁=0.2503₃ 38			D₁=3.3E-7		r₁=2.085₃	(a-X)	18686.7 39
X ¹Σ_g⁺	0	780.77 Z	2.83₅ 40	-0.00462	0.30362 22	0.00149 41	-2.7E-6	1.88E-7		1.8934

Notes

Core configuration as suggested by Bulgin, Dyke, et al., 1976 on the basis of ab initio calculations; Carroll and Mitchell Carroll and Mitchell, 1975 proposed... 4σ_u² 5σ_g 2π_u³ 2π_g.

Carrol and Mitchel's Rydberg series G_n, H_n, P_n, R_n converging to A ²Σ_g⁺(v=0):

v=87179 - R/(n-0.062-0.633/n*²)², n=4(R₄),5...21.

v=87179 - R/(n-0.155-0.179/n*²)², n=4(P₄),5...14.

v=87179 - R/(n-1.468-0.475/n*²)², n=4(H),5(H₅),6...28.

v=87179 - R/(n-1.660-0.252/n*²)², n=4(G),5(N),6(G₆),7...12.

Carrol and Mitchel's Rydberg series E_n, K_n, M_n, L_n converging to X₂ ²Π_1/2(v=1):

v~85895 - R/(n+0.04)², n=3(L),4. Fragments of series with v'=0 (V =85229) and with v'>1.

v~85895 - R/(n+0.03)², n=3(M),4(M₄),5(S). Fragments of series with v'=0 (V =85229) and with v'>1.

v~85895 - R/(n+0.12)², n=3(K),4...10. Fragments of series with v'=0 (V =85229) and with v'>1.

v~85895 - R/(n+1.93)², n=4(E),5(E₅),6. Fragments of series with v'=0 (V =85229) and with v'>1.

Observed to v'=2.

Diffuse bands.

Observed to v'=4.

Assigned as 0-0 band by Creutzberg, 1966; reassigned as 1-0 band by Carroll and Mitchell, 1975 [third member of the M_n(v'=1) Rydberg series].

Broad diffuse bands.

0-0 and 1-1 bands only.

Broad band.

Only v'=1 and 3 (diffuse) observed.

0-0 band obscured by H₅← X 0-0.

Very broad band.

RKR potential functions Singh and Rai, 1966, Rao and Lakshman, 1970.

Following Carroll and Mitchell, 1975 the v' numbering of Creutzberg, 1966 has been increased by one unit.

All lines of this system are diffuse; the diffuseness is largest for v'=3 and 4 such that the rotational structure can no longer be recognized. The broadening is independent of J; the state causing the predissociation is probably ¹Π_u.

Very intense diffuse band, width ~80 cm^-1.

Franck-Condon factors Rao and Lakshman, 1970.

The assignment of v'=0 to the lowest observed level is arbitrary.

ΔG(3/2) = 352.71.

B₁ = 0.2209, B₂ = 0.217₁.

Carroll and Nulty, 1976; slightly different constants in missing citation.

Perturbations by C ¹Σ_u⁺. The observation of extra lines enables the relative position of singlet and triplet levels to be determined Carroll and Nulty, 1976; very similar results have been obtained by Brion, Malicet, et al., 1976, missing citation.

Franck-Condon factors Brion and Malicet, 1976.

Constants from Creutzberg, 1966, but see missing citation whose deperturbation of the C state levels (see 34) leads to T_e = 46945.5₇, ω_e = 472.81, ω_ex_e = 2.24₆, ω_ey_e = +0.00412₂.

Strong vibrational perturbations for v=1,2,3,5 Herzberg, 1932 and many rotational perturbations Marais, 1946, Marais and Verleger, 1950, Naude and Verleger, 1950, Creutzberg, 1966, Brion, Malicet, et al., 1976, 2 due to interaction with levels of c ³Π_u see missing citation. Breaking off in emission (predissociation) above J=58 of v=10 and J=34 of v=11; the corresponding dissociation limit is ⁴S + ²D at 51959 ± 25 cm^-1. A second predissociation indicated by diffuseness in absorption begins at v=17 and reaches a maximum for low J values of v=19 Creutzberg, 1966.

ω_ey_e < 0.001 cm^-1 Carroll and Nulty, 1976; slightly different constants in missing citation.

Recalculated; Brion, Malicet, et al., 1974 give 28507.74 which probably refers to data obtained from band heads rather than band origins.

Spin splitting constants λ = +3.20, γ = -0.001.

Spin splitting constants λ₁= -3.2₁, γ₁= -0.003 Brion and Malicet, 1976.

Not observed; indirectly derived Carroll and Nulty, 1976 from perturbations in c ³Π_u; see 31.

missing citation; slightly different constants in Marais and Verleger, 1950 and Creutzberg, 1966.

Constants recalculated from the data of Herzberg, 1932, Douglas and Rao, 1958, Creutzberg, 1966, Dixit, 1968. Higher B_v values not included in the reevaluation may be found in Herzberg, 1932, Marais and Verleger, 1950.

From the predissociation limit in C ¹Σ_u+ which according to Herzberg, 1932 is equal to the dissociation limit ⁴S+²D. The latest thermochemical (mass-spectrometric) value is 5.04 eV Kordis and Gingerich, 1973 eliminating the possibility that the predissociation limit corresponds to ²D+²D as suggested by Vaidyan and Santaram, 1971.

From the photoelectron spectrum Bulgin, Dyke, et al., 1976 which shows partially resolved peaks at 10.53 and 10.55 eV corresponding to X₁ ²Π_3/2 and X₂ ²Π_1/2, respectively. Subtraction of the estimated doublet splitting in the X ²Π ground state [~ 260 cm^-1, see ref. 6 of P₂⁺] from the Rydberg series limit at 85229 cm^-1 Carroll and Mitchell, 1975 gives l0.53₅ eV.

References

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Constants of diatomic molecules, Notes

Cox, Wagman, et al., 1984
Cox, J.D.; Wagman, D.D.; Medvedev, V.A., CODATA Key Values for Thermodynamics, Hemisphere Publishing Corp., New York, 1984, 1. [all data]

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

O'Hair, Krempp, et al., 1992
O'Hair, R.A.J.; Krempp, M.; Damrauer, R.; Depuy, C.H., Gas-Phase Ion Chemistry of HP2(-), FP2(-), and HP2(+), Inorg. Chem., 1992, 31, 11, 2092, https://doi.org/10.1021/ic00037a021 . [all data]

Jones, Ganteför, et al., 1995
Jones, R.O.; Ganteför, G.; Hunsicker, S.; Pieperhoff, P., Structure and Spectroscopy of Phosphorous Cluster anions: Theory (simulated annealing) and Experiment (Photoelectron Detachment), J. Chem. Phys., 1995, 103, 22, 9549, https://doi.org/10.1063/1.469969 . [all data]

Snodgrass, Coe, et al., 1985
Snodgrass, J.T.; Coe, J.V.; Freidhoff, C.B.; McHugh, K.M.; Bowen, K.H., Negative ion photoelectron spectroscopy of P₂^-, Chem. Phys. Lett., 1985, 122, 352. [all data]

Feldman, Rackwitz, et al., 1977
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Notes

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Symbols used in this document:

AE	Appearance energy
EA	Electron affinity
IE (evaluated)	Recommended ionization energy
S°_{gas,1 bar}	Entropy of gas at standard conditions (1 bar)
Δ_fH°_gas	Enthalpy of formation of gas at standard conditions
Δ_rH°	Enthalpy of reaction at standard conditions

Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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