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	hartrees
Energy at 0K	-378.108384
Energy at 298.15K	-378.114177
HF Energy	-377.430607
Counterpoise corrected energy
CP Energy at 298.15K
Counterpoise optimized geometry corrected energy
CP opt. Energy at 298.15K
Nuclear repulsion energy	228.196536

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A_g	3207	3095	0.00
2	A_g	3187	3076	0.00
3	A_g	1608	1553	0.00
4	A_g	1448	1397	0.00
5	A_g	1371	1324	0.00
6	A_g	1147	1107	0.00
7	A_g	626	605	0.00
8	A_g	201	194	0.00
9	A_g	171	165	0.00
10	A_u	1112	1074	345.02
11	A_u	977	943	130.06
12	A_u	186	180	11.56
13	A_u	95	92	1.10
14	B_g	1070	1033	0.00
15	B_g	974	940	0.00
16	B_g	274	265	0.00
17	B_u	3286	3172	1298.35
18	B_u	3189	3078	310.86
19	B_u	1627	1570	697.03
20	B_u	1445	1395	12.72
21	B_u	1374	1326	61.23
22	B_u	1148	1108	426.47
23	B_u	654	631	43.77
24	B_u	252	243	50.33

Atom	x (Å)	y (Å)
C1	1.618	-1.106
C2	-1.618	1.106
O3	1.618	0.144
O4	-1.618	-0.144
O5	0.519	-1.900
O6	-0.519	1.900
H7	2.540	-1.703
H8	-2.540	1.703
H9	0.356	1.420
H10	-0.356	-1.420

	C1	C2	O3	O4	O5	O6	H7	H8	H9	H10
C1		3.9196	1.2503	3.3757	1.3560	3.6880	1.0985	5.0179	2.8236	1.9991
C2	3.9196		3.3757	1.2503	3.6880	1.3560	5.0179	1.0985	1.9991	2.8236
O3	1.2503	3.3757		3.2485	2.3211	2.7654	2.0646	4.4405	1.7942	2.5189
O4	3.3757	1.2503	3.2485		2.7654	2.3211	4.4405	2.0646	2.5189	1.7942
O5	1.3560	3.6880	2.3211	2.7654		3.9391	2.0311	4.7262	3.3241	0.9980
O6	3.6880	1.3560	2.7654	2.3211	3.9391		4.7262	2.0311	0.9980	3.3241
H7	1.0985	5.0179	2.0646	4.4405	2.0311	4.7262		6.1162	3.8107	2.9103
H8	5.0179	1.0985	4.4405	2.0646	4.7262	2.0311	6.1162		2.9103	3.8107
H9	2.8236	1.9991	1.7942	2.5189	3.3241	0.9980	3.8107	2.9103		2.9282
H10	1.9991	2.8236	2.5189	1.7942	0.9980	3.3241	2.9103	3.8107	2.9282

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
C1	O3	H9	135.326	C1	O5	H10	115.412
C2	O4	H10	135.326	C2	O6	H9	115.412
O3	C1	O5	125.840	O3	C1	H7	122.911
O3	H9	O6	163.423	O4	C2	O6	125.840
O4	C2	H8	122.911	O4	H10	O5	163.423
O5	C1	H7	111.250	O6	C2	H8	111.250

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

using model chemistry: MP2/SDD

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/SDD

States and conformations

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