Chromium monoxide

Formula: CrO
Molecular weight: 67.9955
IUPAC Standard InChI: InChI=1S/Cr.O
IUPAC Standard InChIKey: XVOFZWCCFLVFRR-UHFFFAOYSA-N
CAS Registry Number: 12018-00-7
Chemical structure:
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Constants of diatomic molecules

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

Data collected through December, 1974

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 ⁽⁵²⁾Cr¹⁶O
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 ⁵Π	16586 1	750.₅ H	9.4		0.4874	0.0044				1.703	B → X R	16487.6
	↳Ferguson, 1932; Ghosh, 1932; missing citation; missing citation; Murthy and Nagaraj, 1964
		750.₅ H	9.4		0.4801	0.0048				1.703	B → X R	16501.2
	↳Ferguson, 1932; Ghosh, 1932; missing citation; missing citation; Murthy and Nagaraj, 1964
		750.₅ H	9.4		0.4751	0.0057				1.703	B → X R	16511.3
	↳Ferguson, 1932; Ghosh, 1932; missing citation; missing citation; Murthy and Nagaraj, 1964
		750.₅ H	9.4		0.4735	0.0070				1.703	B → X R	16519.4
	↳Ferguson, 1932; Ghosh, 1932; missing citation; missing citation; Murthy and Nagaraj, 1964
		750.₅ H	9.4		0.4675	0.0050				1.703	B → X R	16515.2
	↳Ferguson, 1932; Ghosh, 1932; missing citation; missing citation; Murthy and Nagaraj, 1964
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
											(11117)
↳missing citation
X ⁵Π	0 2	898.4 H	6.7₅		0.5410	0.0049				1.615
	0 2	898.4 H	6.7₅		0.5348	0.0049				1.615
	0 2	898.4 H	6.7₅		0.5284	0.0050				1.615
	0 2	898.4 H	6.7₅		0.5233	0.0036				1.615
	0 2	898.4 H	6.7₅		0.5231	0.0070				1.615

Notes

|A| ~100.

|A| ~110. Not certain that this is the ground state.

Thermochemical value (mass-spectrom.) Grimley, Burns, et al., 1961.

References

Go To: Top, Constants of diatomic molecules, Notes

Ferguson, 1932
Ferguson, W.F.C., The chromium oxide and the vanadium oxide band spectra, Bur. Stand. J. Res. US, 1932, 8, 381. [all data]

Ghosh, 1932
Ghosh, C., Das bandenspektrum des chromoxyds, Z. Phys., 1932, 78, 521. [all data]

Murthy and Nagaraj, 1964
Murthy, N.S.; Nagaraj, S., A note on the Franck-Condon factors and r-centroids of the CrO (A→X) band system, Proc. Phys. Soc. London, 1964, 84, 827. [all data]

Grimley, Burns, et al., 1961
Grimley, R.T.; Burns, R.P.; Inghram, M.G., Thermodynamics of the vaporization of Cr₂O₃: dissociation energies of CrO, CrO₂, and CrO₃, J. Chem. Phys., 1961, 34, 664. [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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