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	hartrees
Energy at 0K	-372.491028
Energy at 298.15K	-372.497629
HF Energy	-372.491028
Nuclear repulsion energy	238.170403

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A_g	3242	2903	0.00
2	A_g	2386	2137	0.00
3	A_g	1774	1589	0.00
4	A_g	1486	1331	0.00
5	A_g	1348	1207	0.00
6	A_g	1315	1178	0.00
7	A_g	706	633	0.00
8	A_g	534	478	0.00
9	A_g	255	229	0.00
10	A_u	1438	1288	169.14
11	A_u	935	837	1.74
12	A_u	249	223	3.17
13	A_u	95	85	0.00
14	B_g	1438	1288	0.00
15	B_g	957	857	0.00
16	B_g	344	308	0.00
17	B_u	3240	2902	2.41
18	B_u	2955	2646	5218.57
19	B_u	1794	1607	107.20
20	B_u	1708	1529	109.59
21	B_u	1420	1272	40.61
22	B_u	1324	1186	62.72
23	B_u	760	681	4.83
24	B_u	642	575	0.83

Atom	x (Å)	y (Å)
C1	1.896	-0.273
C2	-1.896	0.273
O3	1.325	0.828
O4	-1.325	-0.828
O5	1.325	-1.490
O6	-1.325	1.490
H7	3.004	-0.381
H8	-3.004	0.381
H9	-0.319	1.378
H10	0.319	-1.378

	C1	C2	O3	O4	O5	O6	H7	H8	H9	H10
C1		3.8306	1.2397	3.2686	1.3443	3.6723	1.1134	4.9432	2.7622	1.9257
C2	3.8306		3.2686	1.2397	3.6723	1.3443	4.9432	1.1134	1.9257	2.7622
O3	1.2397	3.2686		3.1254	2.3180	2.7326	2.0686	4.3523	1.7338	2.4247
O4	3.2686	1.2397	3.1254		2.7326	2.3180	4.3523	2.0686	2.4247	1.7338
O5	1.3443	3.6723	2.3180	2.7326		3.9890	2.0117	4.7167	3.3062	1.0131
O6	3.6723	1.3443	2.7326	2.3180	3.9890		4.7167	2.0117	1.0131	3.3062
H7	1.1134	4.9432	2.0686	4.3523	2.0117	4.7167		6.0560	3.7596	2.8643
H8	4.9432	1.1134	4.3523	2.0686	4.7167	2.0117	6.0560		2.8643	3.7596
H9	2.7622	1.9257	1.7338	2.4247	3.3062	1.0131	3.7596	2.8643		2.8289
H10	1.9257	2.7622	2.4247	1.7338	1.0131	3.3062	2.8643	3.7596	2.8289

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
C1	O3	H9	135.896	C1	O5	H10	108.737
C2	O4	H10	135.896	C2	O6	H9	108.737
O3	C1	O5	127.512	O3	C1	H7	122.974
O3	H9	O6	167.854	O4	C2	O6	127.512
O4	C2	H8	122.974	O4	H10	O5	167.854
O5	C1	H7	109.513	O6	C2	H8	109.513

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

using model chemistry: LSDA/STO-3G

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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Number	Element	Mulliken
1	C	0.093
2	C	0.093
3	O	-0.203
4	O	-0.203
5	O	-0.203
6	O	-0.203
7	H	0.104
8	H	0.104
9	H	0.209
10	H	0.209

<r²>	167.466
(<r²>)^1/2	12.941

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

using model chemistry: LSDA/STO-3G

States and conformations

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