CCCBDB listing of experimental data page 2

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Property	Value	Uncertainty	units	Reference	Comment
Hfg(298.15K)	-78.94	0.60	kJ mol^-1	Gurvich	trans
Hfg(0K)	-72.80	0.60	kJ mol^-1	Gurvich	trans
Entropy (298.15K)	249.11		J K^-1 mol^-1	Gurvich	trans
Integrated Heat Capacity (0 to 298.15K)	11.60		kJ mol^-1	Gurvich	trans
Heat Capacity (298.15K)	46.13		J K^-1 mol^-1	Gurvich	trans

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	A'	3591		VEEL5
2	A'	1700		VEEL5
3	A'	1263		VEEL5
4	A'	790		VEEL5
5	A'	596		VEEL5
6	A"	543		Shim

Description	Value	unc.	Connectivity				Reference	Comment
Description	Value	unc.	Atom 1	Atom 2	Atom 3	Atom 4	Reference	Comment
rNO	1.442		2	3			1972Fin/Cox:548
rNO	1.169		3	4			1972Fin/Cox:548
aONO	110.6		2	3	4		1972Fin/Cox:548
rOH	0.959		1	2			1972Fin/Cox:548
aHON	102.1		1	2	3		1972Fin/Cox:548

Atom	x (Å)	y (Å)
H1	1.7545	-0.1823
O2	0.8942	-0.6061
N3	0.0000	0.5252
O4	-1.1135	0.1693

	H1	O2	N3	O4
H1		0.9590	1.8918	2.8895
O2	0.9590		1.4420	2.1522
N3	1.8918	1.4420		1.1690
O4	2.8895	2.1522	1.1690

	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	¹A^'	C_s	True							C_s	2	3

squib	reference	DOI
1972Fin/Cox:548	J. Chem. Soc. Faraday Trans II, 68, 548 (1972)	10.1039/f29726800548
1985Dee/Mil:962	Deeley, C.M.; Mills, I.M.; Halonen, L.O.; Kauppinen, J. "Vibration-rotation spectra of ntrous acid, HONO." Can. J. Phys. 63, 962-965 (1985)	10.1139/p85-157
Gurvich	Gurvich, L.V.; Veyts, I. V.; Alcock, C. B., Thermodynamic Properties of Individual Substances, Fouth Edition, Hemisphere Pub. Co., New York, 1989
Shim	Shimanouchi, T. , Tables of Molecular Vibrational Frequencies, Consolidated Volu	10.6028/NBS.NSRDS.39
VEEL5	M.E. Jacox, Vibrational and Electronic Energy Levels of Polyatomic Transient Molecules, J. Phys. Chem.Ref. Data, Monograph 3 (1994) (updated data in NIST Chemistry Webbook - http://webbook.nist.gov/chemistry/
webbook	NIST Chemistry Webbook (http://webbook.nist.gov/chemistry)	10.18434/T4D303

Bond Type	Count
H-O	1
N-O	1
N=O	1

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Experimental data for HNO2+ (nitrous acid cation)

Experimental data for HNO₂⁺ (nitrous acid cation)