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	hartrees
Energy at 0K	-377.672216
Energy at 298.15K	-377.678666
HF Energy	-377.672216
Nuclear repulsion energy	242.758577

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A_g	3010	2954	0.00
2	A_g	1933	1897	0.00
3	A_g	1587	1557	0.00
4	A_g	1400	1374	0.00
5	A_g	1380	1355	0.00
6	A_g	1148	1127	0.00
7	A_g	701	688	0.00
8	A_g	329	323	0.00
9	A_g	174	171	0.00
10	A_u	1260	1236	201.38
11	A_u	1019	1000	8.17
12	A_u	216	212	10.59
13	A_u	85	83	0.35
14	B_g	1214	1192	0.00
15	B_g	1026	1007	0.00
16	B_g	308	302	0.00
17	B_u	3008	2952	59.77
18	B_u	2106	2067	5586.01
19	B_u	1782	1748	739.84
20	B_u	1481	1453	61.73
21	B_u	1389	1363	92.26
22	B_u	1344	1318	103.26
23	B_u	776	761	18.45
24	B_u	499	490	103.23

Atom	x (Å)	y (Å)
C1	1.566	-1.108
C2	-1.566	1.108
O3	1.566	0.108
O4	-1.566	-0.108
O5	0.513	-1.889
O6	-0.513	1.889
H7	2.502	-1.705
H8	-2.502	1.705
H9	0.314	1.331
H10	-0.314	-1.331

	C1	C2	O3	O4	O5	O6	H7	H8	H9	H10
C1		3.8359	1.2163	3.2869	1.3108	3.6467	1.1106	4.9456	2.7416	1.8924
C2	3.8359		3.2869	1.2163	3.6467	1.3108	4.9456	1.1106	1.8924	2.7416
O3	1.2163	3.2869		3.1388	2.2576	2.7366	2.0410	4.3698	1.7501	2.3672
O4	3.2869	1.2163	3.1388		2.7366	2.2576	4.3698	2.0410	2.3672	1.7501
O5	1.3108	3.6467	2.2576	2.7366		3.9140	1.9976	4.6908	3.2259	0.9968
O6	3.6467	1.3108	2.7366	2.2576	3.9140		4.6908	1.9976	0.9968	3.2259
H7	1.1106	4.9456	2.0410	4.3698	1.9976	4.6908		6.0555	3.7427	2.8402
H8	4.9456	1.1106	4.3698	2.0410	4.6908	1.9976	6.0555		2.8402	3.7427
H9	2.7416	1.8924	1.7501	2.3672	3.2259	0.9968	3.7427	2.8402		2.7350
H10	1.8924	2.7416	2.3672	1.7501	0.9968	3.2259	2.8402	3.7427	2.7350

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
C1	O3	H9	134.318	C1	O5	H10	109.433
C2	O4	H10	134.318	C2	O6	H9	109.433
O3	C1	O5	126.559	O3	C1	H7	122.537
O3	H9	O6	169.690	O4	C2	O6	126.559
O4	C2	H8	122.537	O4	H10	O5	169.690
O5	C1	H7	110.904	O6	C2	H8	110.904

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	0.318
2	C	0.318
3	O	-0.435
4	O	-0.435
5	O	-0.418
6	O	-0.418
7	H	0.146
8	H	0.146
9	H	0.389
10	H	0.389

	x	y	z
x	7.471	-0.215	0.000
y	-0.215	5.818	0.000
z	0.000	0.000	2.616

<r²>	167.057
(<r²>)^1/2	12.925

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)