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	hartrees
Energy at 0K	-376.115744
Energy at 298.15K	-376.121939
HF Energy	-375.434497
Counterpoise corrected energy
CP Energy at 298.15K
Counterpoise optimized geometry corrected energy
CP opt. Energy at 298.15K
Nuclear repulsion energy	232.687169

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A_g	3171	3017	0.00
2	A_g	2830	2692	0.00
3	A_g	1650	1570	0.00
4	A_g	1521	1447	0.00
5	A_g	1463	1391	0.00
6	A_g	1224	1164	0.00
7	A_g	682	649	0.00
8	A_g	251	239	0.00
9	A_g	186	177	0.00
10	A_u	1185	1127	249.31
11	A_u	1034	984	148.34
12	A_u	207	197	9.28
13	A_u	91	86	0.40
14	B_g	1133	1078	0.00
15	B_g	1048	997	0.00
16	B_g	306	291	0.00
17	B_u	3173	3019	4.12
18	B_u	2991	2845	2525.13
19	B_u	1693	1611	444.84
20	B_u	1504	1431	20.98
21	B_u	1468	1397	117.43
22	B_u	1219	1160	300.32
23	B_u	718	683	25.04
24	B_u	342	326	71.81

Atom	x (Å)	y (Å)
C1	1.605	-1.088
C2	-1.605	1.088
O3	1.605	0.151
O4	-1.605	-0.151
O5	0.529	-1.897
O6	-0.529	1.897
H7	2.524	-1.679
H8	-2.524	1.679
H9	0.341	1.400
H10	-0.341	-1.400

	C1	C2	O3	O4	O5	O6	H7	H8	H9	H10
C1		3.8780	1.2393	3.3436	1.3457	3.6692	1.0928	4.9705	2.7908	1.9701
C2	3.8780		3.3436	1.2393	3.6692	1.3457	4.9705	1.0928	1.9701	2.7908
O3	1.2393	3.3436		3.2237	2.3131	2.7569	2.0481	4.4025	1.7770	2.4878
O4	3.3436	1.2393	3.2237		2.7569	2.3131	4.4025	2.0481	2.4878	1.7770
O5	1.3457	3.6692	2.3131	2.7569		3.9382	2.0068	4.7019	3.3018	1.0015
O6	3.6692	1.3457	2.7569	2.3131	3.9382		4.7019	2.0068	1.0015	3.3018
H7	1.0928	4.9705	2.0481	4.4025	2.0068	4.7019		6.0631	3.7746	2.8781
H8	4.9705	1.0928	4.4025	2.0481	4.7019	2.0068	6.0631		2.8781	3.7746
H9	2.7908	1.9701	1.7770	2.4878	3.3018	1.0015	3.7746	2.8781		2.8811
H10	1.9701	2.7908	2.4878	1.7770	1.0015	3.3018	2.8781	3.7746	2.8811

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
C1	O3	H9	134.646	C1	O5	H10	113.327
C2	O4	H10	134.646	C2	O6	H9	113.327
O3	C1	O5	126.926	O3	C1	H7	122.734
O3	H9	O6	165.102	O4	C2	O6	126.926
O4	C2	H8	122.734	O4	H10	O5	165.102
O5	C1	H7	110.340	O6	C2	H8	110.340

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

using model chemistry: MP2/3-21G*

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: MP2/3-21G*

States and conformations

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