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Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3204	3007	33.88
2	A₁	1725	1619	75.16
3	A₁	1288	1209	17.27
4	B₁	786	738	97.25
5	B₂	3290	3088	10.88
6	B₂	435	408	4.51

Atom	y (Å)	z (Å)
C1	0.000	-0.482
C2	0.000	0.827
H3	0.937	-1.035
H4	-0.937	-1.035

	C1	C2	H3	H4
C1		1.3082	1.0880	1.0880
C2	1.3082		2.0843	2.0843
H3	1.0880	2.0843		1.8730
H4	1.0880	2.0843	1.8730

atom1	atom2	atom3	angle		atom1	atom2	atom3	angle
C2	C1	H3	120.602		C2	C1	H4	120.602
H3	C1	H4	118.795

	hartrees
Energy at 0K	-76.932172
Energy at 298.15K	-76.932292
HF Energy	-76.733384
Nuclear repulsion energy	23.683732

All results from a given calculation for CCH₂ (vinylidene)

using model chemistry: MP3/6-31G*

States and conformations

State 1 (¹A₁)

State 2 (³B₂)

	Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3158	2964	3.62
2	A₁	1622	1522	3.45
3	A₁	1463	1373	5.47
4	B₁	944	886	35.95
5	B₂	3238	3039	6.94
6	B₂	1050	986	2.44

Atom	y (Å)	z (Å)
C1	0.000	-0.480
C2	0.000	0.830
H3	0.930	-1.049
H4	-0.930	-1.049

	C1	C2	H3	H4
C1		1.3099	1.0899	1.0899
C2	1.3099		2.0960	2.0960
H3	1.0899	2.0960		1.8598
H4	1.0899	2.0960	1.8598

All results from a given calculation for CCH2 (vinylidene)

using model chemistry: MP3/6-31G*

States and conformations

State 1 (1A1)

State 2 (3B2)

All results from a given calculation for CCH₂ (vinylidene)

State 1 (¹A₁)

State 2 (³B₂)