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	hartrees
Energy at 0K	-378.531879
Energy at 298.15K	-378.537627
HF Energy	-377.543441
Nuclear repulsion energy	231.912161

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A_g	3412	3222	0.00
2	A_g	3154	2979	0.00
3	A_g	1806	1705	0.00
4	A_g	1494	1411	0.00
5	A_g	1444	1364	0.00
6	A_g	1267	1196	0.00
7	A_g	682	644	0.00
8	A_g	197	186	0.00
9	A_g	164	155	0.00
10	A_u	1106	1044	26.14
11	A_u	952	899	290.70
12	A_u	169	160	6.96
13	A_u	70	66	2.07
14	B_g	1094	1033	0.00
15	B_g	914	863	0.00
16	B_g	259	244	0.00
17	B_u	3478	3285	1456.67
18	B_u	3151	2975	167.15
19	B_u	1854	1751	724.92
20	B_u	1472	1390	1.59
21	B_u	1433	1353	48.11
22	B_u	1269	1198	388.08
23	B_u	701	662	62.40
24	B_u	250	236	43.42

Atom	x (Å)	y (Å)
C1	1.665	-1.034
C2	-1.665	1.034
O3	1.665	0.188
O4	-1.665	-0.188
O5	0.601	-1.819
O6	-0.601	1.819
H7	2.592	-1.620
H8	-2.592	1.620
H9	0.222	1.263
H10	-0.222	-1.263

	C1	C2	O3	O4	O5	O6	H7	H8	H9	H10
C1		3.9191	1.2216	3.4352	1.3225	3.6430	1.0969	5.0159	2.7120	1.9003
C2	3.9191		3.4352	1.2216	3.6430	1.3225	5.0159	1.0969	1.9003	2.7120
O3	1.2216	3.4352		3.3506	2.2717	2.7916	2.0319	4.4908	1.7991	2.3797
O4	3.4352	1.2216	3.3506		2.7916	2.2717	4.4908	2.0319	2.3797	1.7991
O5	1.3225	3.6430	2.2717	2.7916		3.8316	2.0007	4.6926	3.1049	0.9932
O6	3.6430	1.3225	2.7916	2.2717	3.8316		4.6926	2.0007	0.9932	3.1049
H7	1.0969	5.0159	2.0319	4.4908	2.0007	4.6926		6.1128	3.7318	2.8360
H8	5.0159	1.0969	4.4908	2.0319	4.6926	2.0007	6.1128		2.8360	3.7318
H9	2.7120	1.9003	1.7991	2.3797	3.1049	0.9932	3.7318	2.8360		2.5637
H10	1.9003	2.7120	2.3797	1.7991	0.9932	3.1049	2.8360	3.7318	2.5637

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
C1	O3	H9	126.677	C1	O5	H10	109.477
C2	O4	H10	126.677	C2	O6	H9	109.477
O3	C1	O5	126.436	O3	C1	H7	122.329
O3	H9	O6	177.411	O4	C2	O6	126.436
O4	C2	H8	122.329	O4	H10	O5	177.411
O5	C1	H7	111.236	O6	C2	H8	111.236

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

using model chemistry: CCSD/6-31G*

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*

States and conformations

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