CCCBDB listing of experimental data page 2

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Property	Value	Uncertainty	units	Reference
Hfg(298.15K)	-110.53	0.17	kJ mol^-1	CODATA
Hfg(0K)	-113.81	0.17	kJ mol^-1	CODATA
Entropy (298.15K)	197.66	0.00	J K^-1 mol^-1	CODATA
Integrated Heat Capacity (0 to 298.15K)	8.67	0.00	kJ mol^-1	CODATA
Heat Capacity (298.15K)	29.14		J K^-1 mol^-1	Gurvich

Mode Number	Symmetry	Frequency			Intensity			Comment	Description
Mode Number	Symmetry	Fundamental(cm^-1)	Harmonic(cm^-1)	Reference	(km mol^-1)	unc.	Reference	Comment	Description
1	Σ	2143	2170	1979HUB/HER

Description	Value	unc.	Connectivity				Reference	Comment
Description	Value	unc.	Atom 1	Atom 2	Atom 3	Atom 4	Reference	Comment
rCO	1.128	0.000	1	2			NISTdiatomic	re

Atom	x (Å)	y (Å)	z (Å)
C1	0.0000	0.0000	0.0000
O2	0.0000	0.0000	1.1282

	C1	O2
C1		1.1282
O2	1.1282

	Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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State	Config	State description	Conf description	Exp. min.	Dipole (Debye)				Reference	comment	Point Group	Components
State	Config	State description	Conf description	Exp. min.	x	y	z	total	Reference	comment	Point Group	dipole	quadrupole
1	1	¹Σ	C_∞v	True				0.112	NSRDS-NBS10	MW	C_∞v	1	1
2	1	³Π	C_∞v	True				1.375	1970Ste/Gam:3467-3482	Omega=2. For Omega=1 1.37454 D	C_∞v	1	1

squib	reference	DOI
1970Ste/Gam:3467-3482	RC Stern,RH Gammon, ME Lesk, RS Freund, WA Klemperer "Fine Structure and Dipole Moment of Metastable a 3Pi Carbon Monoxide" J. Chem. Phys. 52(7), 3467-3482, 1970	10.1063/1.1673512
1979HUB/HER	Huber, K.P.; Herzberg, G., Molecular Spectra and Molecular Structure. IV. Constants of Diatomic Molecules, Van Nostrand Reinhold Co., 1979	10.1007/978-1-4757-0961-2
1997Oln/Can:59	TN Olney, NM Cann, G Cooper, CE Brion, Absolute scale determination for photoabsorption spectra and the calculation of molecular properties using dipole sum-rules, Chem. Phys. 223 (1997) 59-98	10.1016/S0301-0104(97)00145-6
1998Gra/Imr:49	C Graham, DA Imrie, RE Raab "Measurement of the electric quadrupole moments of CO2, CO, N2, Cl2 and BF3" Mol. Phys. 93(1), 1998, 49-56	10.1080/002689798169429
2007Iri:389	KK Irikura "Experimental Vibrational Zero-Point Energies: Diatomic Molecules" J. Phys. Chem. Ref. Data 36(2), 389, 2007	10.1063/1.2436891
CODATA	Cox, J.D.; Wagman, D.D.; Medvedev, V.A.CODATA Key Values for Thermodynamics. Hemisphere, New York, 1989	10.1002/bbpc.19900940121
Gurvich	Gurvich, L.V.; Veyts, I. V.; Alcock, C. B., Thermodynamic Properties of Individual Substances, Fouth Edition, Hemisphere Pub. Co., New York, 1989
NISTdiatomic	NIST Diatomic Spectral Database (www.physics.nist.gov/PhysRefData/MolSpec/Diatomic/index.html)	10.18434/T4T59X
NSRDS-NBS10	R. D. Nelson Jr., D. R. Lide, A. A. Maryott "Selected Values of electric dipole moments for molecules in the gas phase" NSRDS-NBS10, 1967	10.6028/NBS.NSRDS.10
webbook	NIST Chemistry Webbook (http://webbook.nist.gov/chemistry)	10.18434/T4D303

Proton Affinity	unc.	Product	reference	comment
594.0		HCO⁺	webbook	HCO+
426.3		COH⁺	webbook	COH+

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Experimental data for CO (Carbon monoxide)