CCCBDB listing of experimental data page 2

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Property	Value	Uncertainty	units	Reference
Hfg(298.15K)	273.33	5.00	kJ mol^-1	Gurvich
Hfg(0K)	275.00	5.00	kJ mol^-1	Gurvich
Entropy (298.15K)	207.48		J K^-1 mol^-1	Gurvich
Integrated Heat Capacity (0 to 298.15K)	10.02		kJ mol^-1	Gurvich
Heat Capacity (298.15K)	34.97		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	A₁	1996		VEEL5
2	A₁	999		VEEL5
3	B₂	1993		1979HUB/HER

Description	Value	unc.	Connectivity				Reference	Comment
Description	Value	unc.	Atom 1	Atom 2	Atom 3	Atom 4	Reference	Comment
aHSiH	92		2	1	3		1998Gup/Pra:1607
rSiH	1.514		1	2			1998Gup/Pra:1607

Atom	y (Å)	z (Å)
Si1	0.0000	0.0000
H2	0.0000	-1.5141
H3	1.5132	0.0528

	Si1	H2	H3
Si1		1.5141	1.5141
H2	1.5141		2.1783
H3	1.5141	2.1783

	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	¹A₁	C_2v	True							C_2v	1	2
2	1	³B₁	C_2v	True							C_2v	1	2

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
1998Gup/Pra:1607	Gupte, Prasad, Ground State Geometries and Vibrational Spectra of Small Hyrdogenated Silicon Clusters Using Nonorthogonal Tight-binding Molecular Dynamics, Inter. J. of Mod. Phys. B, Vol. 12, #15, pgs. 1607-1622	10.1142/S0217979298000880
1999Hir/Ish:4254	Hirota, E.; Ishikawa, H. "The vibrational spectrum and molecular constants of silicon dihydride SiH2 in the ground electronic state." Journal of Chemical Physics. 110, 4254-4257 (1999)	10.1063/1.478308
Gurvich	Gurvich, L.V.; Veyts, I. V.; Alcock, C. B., Thermodynamic Properties of Individual Substances, Fouth Edition, Hemisphere Pub. Co., New York, 1989
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

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Experimental data for SiH2- (silicon dihydride anion)

Experimental data for SiH₂^- (silicon dihydride anion)