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	hartrees
Energy at 0K	-378.797014
Energy at 298.15K	-378.802851
HF Energy	-377.591834
Nuclear repulsion energy	235.297390

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A_g	3385	3200	0.00
2	A_g	3135	2964	0.00
3	A_g	1798	1700	0.00
4	A_g	1507	1425	0.00
5	A_g	1446	1367	0.00
6	A_g	1277	1207	0.00
7	A_g	692	654	0.00
8	A_g	197	186	0.00
9	A_g	167	158	0.00
10	A_u	1125	1064	17.69
11	A_u	968	915	202.76
12	A_u	173	164	7.55
13	A_u	72	68	1.97
14	B_g	1113	1052	0.00
15	B_g	936	885	0.00
16	B_g	265	251	0.00
17	B_u	3472	3282	1830.96
18	B_u	3132	2961	167.58
19	B_u	1856	1755	715.78
20	B_u	1482	1401	0.06
21	B_u	1439	1361	49.95
22	B_u	1281	1211	340.94
23	B_u	719	680	49.01
24	B_u	259	245	56.36

Atom	x (Å)	y (Å)
C1	1.636	-0.993
C2	-1.636	0.993
O3	1.636	0.219
O4	-1.636	-0.219
O5	0.585	-1.777
O6	-0.585	1.777
H7	2.564	-1.574
H8	-2.564	1.574
H9	0.233	1.228
H10	-0.233	-1.228

	C1	C2	O3	O4	O5	O6	H7	H8	H9	H10
C1		3.8272	1.2123	3.3616	1.3107	3.5505	1.0949	4.9220	2.6269	1.8837
C2	3.8272		3.3616	1.2123	3.5505	1.3107	4.9220	1.0949	1.8837	2.6269
O3	1.2123	3.3616		3.3004	2.2557	2.7127	2.0191	4.4126	1.7275	2.3637
O4	3.3616	1.2123	3.3004		2.7127	2.2557	4.4126	2.0191	2.3637	1.7275
O5	1.3107	3.5505	2.2557	2.7127		3.7418	1.9891	4.5984	3.0256	0.9856
O6	3.5505	1.3107	2.7127	2.2557	3.7418		4.5984	1.9891	0.9856	3.0256
H7	1.0949	4.9220	2.0191	4.4126	1.9891	4.5984		6.0169	3.6445	2.8185
H8	4.9220	1.0949	4.4126	2.0191	4.5984	1.9891	6.0169		2.8185	3.6445
H9	2.6269	1.8837	1.7275	2.3637	3.0256	0.9856	3.6445	2.8185		2.5000
H10	1.8837	2.6269	2.3637	1.7275	0.9856	3.0256	2.8185	3.6445	2.5000

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
C1	O3	H9	125.738	C1	O5	H10	109.418
C2	O4	H10	125.738	C2	O6	H9	109.418
O3	C1	O5	126.724	O3	C1	H7	122.038
O3	H9	O6	178.119	O4	C2	O6	126.724
O4	C2	H8	122.038	O4	H10	O5	178.119
O5	C1	H7	111.238	O6	C2	H8	111.238

All results from a given calculation for C₂H₄O₄ (Formic acid dimer)

using model chemistry: CCSD/6-31G(2df,p)

States and conformations

	Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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All results from a given calculation for C2H4O4 (Formic acid dimer)

using model chemistry: CCSD/6-31G(2df,p)

States and conformations

All results from a given calculation for C₂H₄O₄ (Formic acid dimer)