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	hartrees
Energy at 0K	-76.334499
Energy at 298.15K	-76.334517
Nuclear repulsion energy	23.996169

	hartrees
Energy at 0K	-76.312626
Energy at 298.15K	-76.312742
HF Energy	-76.312626
Nuclear repulsion energy	23.342354

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3237	2936	5.16
2	A₁	1607	1457	0.47
3	A₁	1402	1272	9.76
4	B₁	882	800	56.40
5	B₂	3315	3006	8.86
6	B₂	1123	1018	2.11

Atom	y (Å)	z (Å)
C1	0.000	-0.496
C2	0.000	0.849
H3	0.919	-1.058
H4	-0.919	-1.058

	C1	C2	H3	H4
C1		1.3454	1.0772	1.0772
C2	1.3454		2.1170	2.1170
H3	1.0772	2.1170		1.8384
H4	1.0772	2.1170	1.8384

All results from a given calculation for CCH₂ (vinylidene)

using model chemistry: ROHF/3-21G

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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Number	Element	Mulliken
1	C	-0.460
2	C	0.004
3	H	0.228
4	H	0.228

	x	y	z	Total
	0.000	0.000	-0.487	0.487
CHELPG
AIM
ESP

<r²>	17.496
(<r²>)^1/2	4.183

All results from a given calculation for CCH2 (vinylidene)

using model chemistry: ROHF/3-21G

States and conformations

State 1 (1A1)

State 2 (3B2)

All results from a given calculation for CCH₂ (vinylidene)

State 1 (¹A₁)

State 2 (³B₂)