HGa

Formula: GaH
Molecular weight: 70.731
CAS Registry Number: 13572-92-4
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Gas phase ion energetics data

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Data compiled by: John E. Bartmess

De-protonation reactions

+ = HGa

By formula: Ga^- + H⁺ = HGa

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	369.6 ± 3.3	kcal/mol	D-EA	Williams, Carpenter, et al., 1998	gas phase
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	363.9 ± 3.6	kcal/mol	H-TS	Williams, Carpenter, et al., 1998	gas phase

Constants of diatomic molecules

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

Data collected through July, 1976

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 ⁽⁶⁹⁾GaH
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
Open-structure absorption bands in the region 41650 - 46300 cm^-1, provisionally ascribed to GaH.
↳Garton, 1951
A ¹Π					[5.1] 1 2					[1.8₂]	A ↔ x R	23714 H^Q
A ¹Π	↳Neuhaus, 1957; Ginter and Innes, 1961; Kronekvist, Lagerqvist, et al., 1971
a ³Π₂					[6.811]			[0.000620] 3		[1.578₅]	a → X V	17909.43 Z
a ³Π₂	↳missing citation
a ³Π₁	17622.0₁	1631.1₇ Z	58.2₂	-7.47	6.692 4	0.326 5	-0.0315	0.000489 6		1.592₅	a ↔ X V_R	17626.84 Z
a ³Π₁	↳Neuhaus, 1957; 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 ³Π₀₊	17337.08	1640.54 Z	62.72 7	-6.195	6.394 4	0.276 8	-0.04	0.000262 9		1.629₂	a ↔ X R_V	17345.78 Z
a ³Π₀₊	↳Neuhaus, 1957; missing citation
a ³Π_0-	17333	[1492.5] Z	10		6.358	0.220 11	-0.058	[0.000243] 12		1.633₈	a → X 13 R_V	17340.41 Z
a ³Π_0-	↳Poynor, Innes, et al., 1967
X ¹Σ⁺	0	1604.52 Z	28.77	0.36	6.137 4	0.181 14	-0.0005	0.000342 15		1.663₀

Notes

From the value for GaD.

Deuteride bands involving this level have diffuse rotational lines whose width increases with J. Corresponding lines of the hydride are even broader, only diffuse Q and R heads can be recognized. The diffuseness results from tunnelling through a potential maximum which separates the shallow potential well from the dissociation limit ²P_3/2 + ²S.

D_RP - D_Q= +12E-6.

RKR potential functions Ginter and Battino, 1965.

Rotational constants derived from R and P branches. Slightly different B_v and D_v values from the Q branches; see Ginter and Innes, 1961.

D_v= -124E-6(v+1/2) + 83.5E-6(v+1/2)²; see 5.

missing note

D_v= +75E-6(v+1/2) + 14.5E-6(v+1/2)².

ΔG(3/2) = 1313.6.

missing note

D₁ = 4l3E-6, D₂ = 46₃E-6.

Each band consists of a single Q branch.

missing note

D_v= +1E-6(v+1/2)².

From the predissociation of A ¹Π(v=0), see 2.

Calculated from v₀(0-1) = 22745.8 using ground state vibrational constants derived from GaH. The 0-0 band was not observed owing to a strong overlapping impurity.

References

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Williams, Carpenter, et al., 1998
Williams, W.W.; Carpenter, D.L.; Covington, A.M.; Koepnick, M.C.; Calabrese, D.; Thompson, J.S., Laser photodetachment electron spectrometry of Ga-, J. Phys. B: Atom. Mol. Opt. Phys., 1998, 31, 8, L341-L345, https://doi.org/10.1088/0953-4075/31/8/003 . [all data]

Garton, 1951
Garton, W.R.S., Extension of line series in the arc spectrum of indium: ultra-violet absorption bands probably due to InH and GaH, Proc. Phys. Soc. London Sect. A, 1951, 64, 509. [all data]

Neuhaus, 1957
Neuhaus, H., Band spectrum of gallium hydride and gallium deuteride, Nature (London), 1957, 180, 433. [all data]

Ginter and Innes, 1961
Ginter, M.L.; Innes, K.K., Band spectrum of the GaH molecule, J. Mol. Spectrosc., 1961, 7, 64. [all data]

Kronekvist, Lagerqvist, et al., 1971
Kronekvist, M.; Lagerqvist, A.; Neuhaus, H., The A¹Π-X¹Σ⁺ transition in the spectra of GaH and GaD, J. Mol. Spectrosc., 1971, 39, 516. [all data]

Poynor, Innes, et al., 1967
Poynor, P.C.; Innes, K.K.; Ginter, M.L., The a³Π₀^- → X¹Σ⁺ transition of the GaH molecule, J. Mol. Spectrosc., 1967, 23, 237. [all data]

Ginter and Battino, 1965
Ginter, M.L.; Battino, R., On the calculation of potential curves by the Rydberg-Klein-Rees method. I. Experimental limitations, extrapolation procedures, and applications to the third-group hydrides, J. Chem. Phys., 1965, 42, 3222. [all data]

Notes

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Symbols used in this document:

Δ_rG° Free energy of reaction 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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Δ_rG°	Free energy of reaction at standard conditions
Δ_rH°	Enthalpy of reaction at standard conditions