CCCBDB listing of experimental data page 2

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Property	Value	Uncertainty	units	Reference
Hfg(298.15K)	583.86	22.00	kJ mol^-1	Gurvich
Hfg(0K)	580.00	22.00	kJ mol^-1	Gurvich
Entropy (298.15K)	238.00		J K^-1 mol^-1	Gurvich
Integrated Heat Capacity (0 to 298.15K)	10.30		kJ mol^-1	Gurvich
Heat Capacity (298.15K)	36.26		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_g	507	511	VEEL5

Description	Value	unc.	Connectivity				Reference	Comment
Description	Value	unc.	Atom 1	Atom 2	Atom 3	Atom 4	Reference	Comment
rSiSi	2.246		1	2			1979HUB/HER	re

Atom	x (Å)	y (Å)	z (Å)
Si1	0.0000	0.0000	0.0000
Si2	0.0000	0.0000	2.2460

	Si1	Si2
Si1		2.2460
Si2	2.2460

	Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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Energy (cm^-1)	Degeneracy	reference	description
0	3	1979HUB/HER	³Σ_g
669	6	1991Kit/Chi:1441	¹Σ_g
3509	2	1991Kit/Chi:1441
4783	2	1991Kit/Chi:1441
5138	1	1991Kit/Chi:1441
9000	1	Gurvich
24428.98	3	Gurvich

Experimental data for Si2- (silcon diatomic anion)

Experimental data for Si₂^- (silcon diatomic anion)