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	hartrees
Energy at 0K	-378.695925
Energy at 298.15K	-378.701797
HF Energy	-377.609513
Counterpoise corrected energy	-378.695925
CP Energy at 298.15K	-378.701797
Counterpoise optimized geometry corrected energy
CP opt. Energy at 298.15K
Nuclear repulsion energy	234.256911

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A_g	3161	3063	0.00
2	A_g	3135	3038	0.00
3	A_g	1691	1639	0.00
4	A_g	1478	1433	0.00
5	A_g	1394	1351	0.00
6	A_g	1241	1203	0.00
7	A_g	672	652	0.00
8	A_g	211	205	0.00
9	A_g	170	165	0.00
10	A_u	1110	1076	73.89
11	A_u	985	955	110.72
12	A_u	176	171	9.41
13	A_u	69	67	2.08
14	B_g	1080	1047	0.00
15	B_g	970	941	0.00
16	B_g	259	251	0.00
17	B_u	3248	3148	2013.45
18	B_u	3151	3054	468.41
19	B_u	1753	1699	742.79
20	B_u	1453	1408	2.73
21	B_u	1389	1346	26.62
22	B_u	1248	1210	337.95
23	B_u	704	683	38.88
24	B_u	278	269	65.07

Atom	x (Å)	y (Å)
C1	1.641	-0.978
C2	-1.641	0.978
O3	1.641	0.255
O4	-1.641	-0.255
O5	0.574	-1.762
O6	-0.574	1.762
H7	2.574	-1.562
H8	-2.574	1.562
H9	0.252	1.196
H10	-0.252	-1.196

	C1	C2	O3	O4	O5	O6	H7	H8	H9	H10
C1		3.8200	1.2326	3.3601	1.3241	3.5233	1.1006	4.9203	2.5800	1.9050
C2	3.8200		3.3601	1.2326	3.5233	1.3241	4.9203	1.1006	1.9050	2.5800
O3	1.2326	3.3601		3.3207	2.2818	2.6792	2.0422	4.4123	1.6780	2.3848
O4	3.3601	1.2326	3.3207		2.6792	2.2818	4.4123	2.0422	2.3848	1.6780
O5	1.3241	3.5233	2.2818	2.6792		3.7070	2.0095	4.5780	2.9762	1.0012
O6	3.5233	1.3241	2.6792	2.2818	3.7070		4.5780	2.0095	1.0012	2.9762
H7	1.1006	4.9203	2.0422	4.4123	2.0095	4.5780		6.0208	3.6053	2.8488
H8	4.9203	1.1006	4.4123	2.0422	4.5780	2.0095	6.0208		2.8488	3.6053
H9	2.5800	1.9050	1.6780	2.3848	2.9762	1.0012	3.6053	2.8488		2.4451
H10	1.9050	2.5800	2.3848	1.6780	1.0012	2.9762	2.8488	3.6053	2.4451

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
C1	O3	H9	124.133	C1	O5	H10	109.238
C2	O4	H10	124.133	C2	O6	H9	109.238
O3	C1	O5	126.335	O3	C1	H7	122.052
O3	H9	O6	179.707	O4	C2	O6	126.335
O4	C2	H8	122.052	O4	H10	O5	179.707
O5	C1	H7	111.613	O6	C2	H8	111.613

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

using model chemistry: MP2=FULL/aug-cc-pVDZ

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: MP2=FULL/aug-cc-pVDZ

States and conformations

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