Arsenic monohydride

Formula: AsH
Molecular weight: 75.92954
IUPAC Standard InChI: InChI=1S/AsH/h1H
IUPAC Standard InChIKey: UIESIEAPEWREMY-UHFFFAOYSA-N
CAS Registry Number: 12628-08-9
Chemical structure:
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Constants of diatomic molecules

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

Data collected through February, 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 ⁷⁵AsH
State	T_e	ω_e	B_e	α_e	D_e	r_e	Trans.	ν₀₀
A ³Π_i 0	1	[1207.5] 2 Z	[6.5623] 3 4	0.886 2	[0.000703]	[1.6203] 5	A ← X R	30518.34 Z
A ³Π_i 0	↳Dixon and Lamberton, 1968; Veseth, 1972
A ³Π_i 1			[6.4726] 6 4		[0.000624]		A ← X R	29821.97 Z
A ³Π_i 1	↳Dixon and Lamberton, 1968; Veseth, 1972
A ³Π_i 2			[6.3387] 4		[0.000554]		A ← X R	29282.16 Z
A ³Π_i 2	↳Dixon and Lamberton, 1968; Veseth, 1972
X ³Σ^-	0 7	(2130)	[7.199₈] 7		[0.00032₉]	[1.5344]

Notes

A₀ = -615.4. Small J-dependence Veseth, 1972.

ΔG(1/2) and α for the ³Π₀₊ component only.

Λ-type doubling,Δν_ef(v=0) = +44.72 + 0.0056J(J+1).

Lines are sharp for the ³Π₀₊ state only. Line width increases in the order ³Π₀₊ < ³Π_0- < ³Π₁ < ³Π₂, and also with increasing vibrational energy. The predissociation is due to interaction with the unstable ⁵Σ^- state arising from As(⁴S) + H(²S) Dixon and Lamberton, 1968.

From the "true" B₀ values in Veseth, 1972.

Λ-type doubling,Δν_ef(v=0) = +0.0214J(J+1).

Spin splitting constants λ₀ = +58.87, γ₀ = -0.281.

From the predissociation in A ³Π.

From a short extrapolation Dixon and Lamberton, 1968 of the ³Π state to the limit As(²D) + H(²S).

A₀ = -616.9, small J-dependence Veseth, 1972; A₁ = -599.₈.

Λ-type doubling, Δν_ef(v=0) = +43.39 + 0.00472J(J+1).

Λ-type doubling, Δν_ef(v=0) = +0.0046J(J+1).

Spin splitting constants λ₀ = +58.811, γ₀ = -0.l47₅.

H₀ = +5E-9.

References

Go To: Top, Constants of diatomic molecules, Notes

Dixon and Lamberton, 1968
Dixon, R.N.; Lamberton, H.M., The A, ³Π_i-X, ³Σ^- band systems of AsH and AsD, J. Mol. Spectrosc., 1968, 25, 12. [all data]

Veseth, 1972
Veseth, I., Fine structure of ³Π and ³Σ^- states in diatomic molecules, J. Phys. B:, 1972, 5, 229. [all data]

Notes

Go To: Top, Constants of diatomic molecules, References

Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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