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	hartrees
Energy at 0K	-377.656490
Energy at 298.15K	-377.662743
HF Energy	-377.656490
Nuclear repulsion energy	240.638170

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A_g	3025	2968	0.00
2	A_g	2213	2171	0.00
3	A_g	1596	1566	0.00
4	A_g	1508	1480	0.00
5	A_g	1375	1349	0.00
6	A_g	1315	1291	0.00
7	A_g	694	681	0.00
8	A_g	272	267	0.00
9	A_g	187	184	0.00
10	A_u	1166	1144	194.38
11	A_u	1006	988	25.90
12	A_u	202	198	8.48
13	A_u	82	80	0.88
14	B_g	1112	1091	0.00
15	B_g	1021	1002	0.00
16	B_g	303	297	0.00
17	B_u	3024	2967	44.67
18	B_u	2456	2410	4548.12
19	B_u	1791	1758	694.32
20	B_u	1447	1419	41.75
21	B_u	1386	1360	75.76
22	B_u	1321	1297	182.39
23	B_u	757	743	25.79
24	B_u	401	394	109.60

Atom	x (Å)	y (Å)
C1	1.568	-1.109
C2	-1.568	1.109
O3	1.568	0.107
O4	-1.568	-0.107
O5	0.515	-1.892
O6	-0.515	1.892
H7	2.504	-1.706
H8	-2.504	1.706
H9	0.313	1.334
H10	-0.313	-1.334

	C1	C2	O3	O4	O5	O6	H7	H8	H9	H10
C1		3.8407	1.2162	3.2917	1.3114	3.6528	1.1103	4.9500	2.7462	1.8939
C2	3.8407		3.2917	1.2162	3.6528	1.3114	4.9500	1.1103	1.8939	2.7462
O3	1.2162	3.2917		3.1428	2.2588	2.7429	2.0407	4.3743	1.7548	2.3691
O4	3.2917	1.2162	3.1428		2.7429	2.2588	4.3743	2.0407	2.3691	1.7548
O5	1.3114	3.6528	2.2588	2.7429		3.9210	1.9970	4.6967	3.2316	0.9985
O6	3.6528	1.3114	2.7429	2.2588	3.9210		4.6967	1.9970	0.9985	3.2316
H7	1.1103	4.9500	2.0407	4.3743	1.9970	4.6967		6.0596	3.7471	2.8411
H8	4.9500	1.1103	4.3743	2.0407	4.6967	1.9970	6.0596		2.8411	3.7471
H9	2.7462	1.8939	1.7548	2.3691	3.2316	0.9985	3.7471	2.8411		2.7397
H10	1.8939	2.7462	2.3691	1.7548	0.9985	3.2316	2.8411	3.7471	2.7397

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
C1	O3	H9	134.341	C1	O5	H10	109.400
C2	O4	H10	134.341	C2	O6	H9	109.400
O3	C1	O5	126.636	O3	C1	H7	122.534
O3	H9	O6	169.622	O4	C2	O6	126.636
O4	C2	H8	122.534	O4	H10	O5	169.622
O5	C1	H7	110.829	O6	C2	H8	110.829

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

using model chemistry: LSDA/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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Number	Element	Mulliken
1	C	0.280
2	C	0.280
3	O	-0.429
4	O	-0.429
5	O	-0.463
6	O	-0.463
7	H	0.180
8	H	0.180
9	H	0.433
10	H	0.433

	x	y	z
x	7.402	-0.331	0.000
y	-0.331	5.830	0.000
z	0.000	0.000	2.580

<r²>	171.544
(<r²>)^1/2	13.097

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

using model chemistry: LSDA/6-31G*

States and conformations

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