Arsenic monoxide

Formula: AsO
Molecular weight: 90.9210
IUPAC Standard InChI: InChI=1S/AsO/c1-2
IUPAC Standard InChIKey: GPSSQIRGCXEBSH-UHFFFAOYSA-N
CAS Registry Number: 12005-99-1
Chemical structure:
This structure is also available as a 2d Mol file
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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 ⁷⁵As¹⁶O
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 ²Σ⁺	39866.0	1098.3 H^Q	6.1		[0.51284] 1 2	0.0036 3		[0.000000457]		1.5764	B ↔ X V	38905.88 Z
	↳Connelly, 1934; missing citation; missing citation; Meyer, 1965; Lakshman and Rao, 1971
											B ↔ X V	39931.36 Z
C ²Δ 5/2	38686	655.7 4	4.53		0.4164 4	0.004		[0.00000141]		1.765	C → X R	37506 4
C ²Δ 5/2	↳Lakshman and Rao, 1960; Goure, Figuet, et al., 1972; Anderson and Callomon, 1973
C ²Δ 3/2	(38638) 5				[0.4028]						C → X R	38483
C' ²Φ or ²Δ	(38800)	(600) 6			(0.3798) 6	(0.0058)
C' ²Φ or ²Δ	↳Goure, Figuet, et al., 1972; Anderson and Callomon, 1973
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
D ²Σ^-	37555.4	629.9 7 Z	3.79		0.3793 7 8	0.0034		0.00000065		1.794₂	d → x R	36361.7 Z
	↳Lakshman and Rao, 1960; Callomon and Morgan, 1965; d'Incan and Goure, 1965; Meyer, 1965; Goure and d'Incan, 1969; Topouzkhanian, Goure, et al., 1970; Goure, Figuet, et al., 1972; Anderson and Callomon, 1973
											d → x R	37387.1 Z
D' ²Σ^-	[37857] 9				[0.360] 9
D' ²Σ^-	↳Anderson and Callomon, 1973
H ²Π 1/2	10										H → X R	10
H ²Π 1/2	↳d'Incan and Goure, 1969; Anderson and Callomon, 1973
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
H ²Π 3/2	37053.7	606.92 Z	4.913		0.36539 11 12	0.00273		0.00000054		1.8709	H → X R	35848.2 Z
H ²Π 3/2	↳d'Incan and Goure, 1969; Anderson and Callomon, 1973
A ²Σ⁺	31652.45	686.68 Z	10.78		0.4624 13 14	0.0071		0.000000856 15	0.18E-7	1.6631	A → X R	30485.28 Z
	↳missing citation; missing citation; Klynning, 1962; missing citation; Meyer, 1965; Lakshman and Rao, 1971
											A → X R	31510.87 Z
Fragments of additional systems of R shaded emission bands in the region 25000 - 30000 cm^-1.
↳Venkataramanaiah and Lakshman, 1964; Anderson and Callomon, 1973
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' ²Π 1/2	26485.2 16 17	630.30 Z	3.006	0.010	0.37183 11 18 17	0.002701		5.0E-07		1.8553	A' → X R	26317.30 Z
A' ²Π 1/2	↳Callomon and Morgan, 1965; missing citation; Goure and d'Incan, 1969; Kushawaha, Asthana, et al., 1972; Anderson and Callomon, 1973
A' ²Π 3/2	26168.4	633.23 Z	2.895		0.37124 11	0.002622		5.0E-07		1.8553	A' → X R	24976.59 Z
Fragments of a weak system of R shaded emission bands in the region 15300 - 17300 cm^-1.
↳Kushawaha, Asthana, et al., 1972
X ²Π_r 3/2	1025.97 19	965.90 Z	4.909	-0.0034	0.48552 11	0.003320	-0.0000046	0.00000049		1.6236
X ²Π_r 1/2	0	967.08 Z	4.850	-0.0015	0.48482 11 20	0.003299	-0.0000025	0.00000049		1.6236

Notes

Spin splitting constant γ₀ = +0.0043.

Weak predissociation above v=0,N=20 ( missing citation for As¹⁸O) Callomon and Morgan, 1965, Meyer, 1965, attributed Callomon and Morgan, 1965 to interaction with the unstable ⁴Σ⁺ state arising from ground state atomic products.

Estimated from band head separations.

Deperturbed Goure, Figuet, et al., 1972 constants. Strong perturbations by successive levels in both doublet components of a ²Φ or ²Δ state, and possibly by other states.

Only v=0 observed.

From perturbations in C ²Δ_5/2 vibrational numbering unknown.

v=0 and 1, formerly d'Incan and Goure, 1969 attributed to a ⁴Σ state, are perturbed by levels of a ²Σ^- state and of H ²Π _1/2, _3/2 Anderson and Callomon, 1973.

The spin splitting constant γ_v increases from γ₀ = +0.021 to γ₇ = +0.039.

Lowest observed level, from a perturbation in D(v=0). Vibrational numbering unknown.

Bands of the 1/2-1/2 transition have not been identified. One level of ²Π_1/2 (vibrational numbering unknown) may be responsible for a perturbation in D ²Σ^- (v=0).

Effective constants.

Perturbations in v=1,2 by v=0,l, resp., of D ²Σ^-.

Spin splitting constant γ = -0.035.

v=0,1,2 perturbed by v=9...12 of A' ²Π _1/2. Additional perturbations by unidentified levels of Σ and Π symmetry Callomon and Morgan, 1965, Anderson and Callomon, 1973.

H_e= -2.6E-12.

A_e = -316.08.

The levels v=9...12 of ²Π_1/2 have been observed in perturbations of A ²Σ⁺(v=0,1,2) and were previously Callomon and Morgan, 1965 assigned to a state G ²Π.

Λ-type doubling Δν_fe = -0.002(J+1/2).

A_e= +1026.94.

Λ-type doubling Δν_fe = +0.0179(J+1/2).

From the predissociation in B ²Σ⁺.

References

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Connelly, 1934
Connelly, F.C., The band spectrum of arsenic oxide (AsO), Proc. Phys. Soc. London, 1934, 46, 790. [all data]

Meyer, 1965
Meyer, B., The ultraviolet spectrum of AsO, J. Mol. Spectrosc., 1965, 18, 443. [all data]

Lakshman and Rao, 1971
Lakshman, S.V.J.; Rao, T.V.R., RKRV curves, r-centroids and Franck-Condon factors for certain bands of AsO and AsO⁺ molecules, J. Phys. B:, 1971, 4, 269. [all data]

Lakshman and Rao, 1960
Lakshman, S.V.J.; Rao, P.T., Ultraviolet band spectra of AsO and AsO⁺, Indian J. Phys., 1960, 34, 278. [all data]

Goure, Figuet, et al., 1972
Goure, J.P.; Figuet, J.; Massot, J.N.; d'Incan, J., Analyse rotationnelle des etats C²Δ et D²Σ^- de AsO: perturbations de l'etat C, Can. J. Phys., 1972, 50, 1926. [all data]

Anderson and Callomon, 1973
Anderson, V.M.; Callomon, J.H., Further analyses of the emission spectra of arsenic monoxide AsO, J. Phys. B:, 1973, 6, 1664. [all data]

Callomon and Morgan, 1965
Callomon, J.H.; Morgan, J.E., Rotational analysis of the emission spectra of arsenic monoxide, AsO, Proc. Phys. Soc. London, 1965, 86, 1091. [all data]

d'Incan and Goure, 1965
d'Incan, J.; Goure, J.P., Analyse de la structure de rotation de plusieurs bandes du systeme D → X²Π de la molecule AsO, C.R. Acad. Sci. Paris, 1965, 261, 3086. [all data]

Goure and d'Incan, 1969
Goure, J.-P.; d'Incan, J., Nouvelles bandes de la molecule AsO, C.R. Acad. Sci. Paris, Ser. B, 1969, 268, 1311. [all data]

Topouzkhanian, Goure, et al., 1970
Topouzkhanian, A.; Goure, J.-P.; Figuet, J.; d'Incan, J., Source pour l'emission dans l'ultraviolet du vide de spectres de molecules diatomiques lourdes et d'atomes. Cas des radicaux AsO, AsO⁺ et de l'atome d'arsenic, C.R. Acad. Sci. Paris, Ser. B, 1970, 270, 1676. [all data]

d'Incan and Goure, 1969
d'Incan, J.; Goure, J.P., Nouveaux systemes de bandes electroniques attribues a la molecule AsO, C.R. Acad. Sci. Paris, Ser. B, 1969, 268, 1647. [all data]

Klynning, 1962
Klynning, L., Das Bandenspektrum des Arsenikoxydes, Die Naturwissenschaften, 1962, 49, 252. [all data]

Venkataramanaiah and Lakshman, 1964
Venkataramanaiah, M.; Lakshman, S.V.J., The emission band spectrum of AsO, Indian J. Phys., 1964, 38, 209. [all data]

Kushawaha, Asthana, et al., 1972
Kushawaha, V.S.; Asthana, B.P.; Pathak, C.M., Chemical excitation of AsO, J. Mol. Spectrosc., 1972, 41, 577. [all data]

Notes

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Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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