CCCBDB listing of experimental data page 2

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Property	Value	Uncertainty	units	Reference
Hfg(298.15K)	-27.85	3.20	kJ mol^-1	Gurvich
Hfg(0K)	-27.54	3.20	kJ mol^-1	Gurvich
Entropy (298.15K)	222.74		J K^-1 mol^-1	Gurvich
Integrated Heat Capacity (0 to 298.15K)	9.39		kJ mol^-1	Gurvich
Heat Capacity (298.15K)	31.76		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	1220	1233	1979HUB/HER

Description	Value	unc.	Connectivity				Reference	Comment
Description	Value	unc.	Atom 1	Atom 2	Atom 3	Atom 4	Reference	Comment
rPO	1.476		1	2			1979HUB/HER	re

Atom	x (Å)	y (Å)	z (Å)
O1	0.0000	0.0000	0.0000
P2	0.0000	0.0000	1.4759

	O1	P2
O1		1.4759
P2	1.4759

	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	²Π	C_∞v	True			1.880	1.880	1988Kan/Yam:89	MW μ₀ ± 0.07 D	C_∞v	1	1

squib	reference	DOI
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
1988Kan/Yam:89	H Kanata, S Yamamoto, S Saito "The dipole moment of the PO radical determined by microwave spectroscopy" J. Mol. Spect. 131, 89-95 (1988)	10.1016/0022-2852(88)90109-9
2002Rie/Tsc:231	JC Rienstra-Kiracofe, GS Tschumper, HF Schaefer III, S Nandi, GB Ellison "Atomic and Molecular Electron Affinities: Photoelectron Experiments and Theoretical Computations" Chemical Reviews 2002, 102, 231-282	10.1021/cr990044u
2007Iri:389	KK Irikura "Experimental Vibrational Zero-Point Energies: Diatomic Molecules" J. Phys. Chem. Ref. Data 36(2), 389, 2007	10.1063/1.2436891
Gurvich	Gurvich, L.V.; Veyts, I. V.; Alcock, C. B., Thermodynamic Properties of Individual Substances, Fouth Edition, Hemisphere Pub. Co., New York, 1989
webbook	NIST Chemistry Webbook (http://webbook.nist.gov/chemistry)	10.18434/T4D303

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Experimental data for PO- (phosphorus monoxide anion)

Experimental data for PO^- (phosphorus monoxide anion)