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	hartrees
Energy at 0K	-377.318837
Energy at 298.15K	-377.322473
HF Energy	-377.318837
Nuclear repulsion energy	279.211841

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3439	3110	0.12
2	A₁	2137	1933	114.06
3	A₁	1808	1636	0.88
4	A₁	1423	1287	240.84
5	A₁	1172	1060	16.01
6	A₁	953	862	5.29
7	A₁	697	631	0.81
8	A₁	449	406	19.10
9	A₂	1085	981	0.00
10	A₂	856	775	0.00
11	A₂	280	254	0.00
12	B₁	959	867	115.39
13	B₁	715	647	1.16
14	B₁	175	158	4.32
15	B₂	3416	3089	0.02
16	B₂	2059	1862	1024.64
17	B₂	1460	1320	0.30
18	B₂	1201	1086	124.99
19	B₂	1057	956	87.41
20	B₂	775	701	23.94
21	B₂	609	551	1.94

Atom	y (Å)	z (Å)
O1	0.000	0.947
C2	1.113	0.168
C3	-1.113	0.168
O4	2.196	0.598
O5	-2.196	0.598
C6	0.658	-1.252
C7	-0.658	-1.252
H8	1.346	-2.072
H9	-1.346	-2.072

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.3579	1.3579	2.2239	2.2239	2.2949	2.2949	3.3051	3.3051
C2	1.3579		2.2253	1.1660	3.3369	1.4913	2.2697	2.2523	3.3262
C3	1.3579	2.2253		3.3369	1.1660	2.2697	1.4913	3.3262	2.2523
O4	2.2239	1.1660	3.3369		4.3929	2.4064	3.4015	2.8022	4.4361
O5	2.2239	3.3369	1.1660	4.3929		3.4015	2.4064	4.4361	2.8022
C6	2.2949	1.4913	2.2697	2.4064	3.4015		1.3156	1.0706	2.1652
C7	2.2949	2.2697	1.4913	3.4015	2.4064	1.3156		2.1652	1.0706
H8	3.3051	2.2523	3.3262	2.8022	4.4361	1.0706	2.1652		2.6923
H9	3.3051	3.3262	2.2523	4.4361	2.8022	2.1652	1.0706	2.6923

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	123.384	O1	C2	C6	107.220
O1	C3	O5	123.384	O1	C3	C7	107.220
C2	O1	C3	110.044	C2	C6	C7	107.758
C2	C6	H8	122.228	C3	C7	C6	107.758
C3	C7	H9	122.228	O4	C2	C6	129.395
O5	C3	C7	129.395	C6	C7	H9	130.014
C7	C6	H8	130.014

All results from a given calculation for C₄H₂O₃ (Maleic Anhydride)

using model chemistry: HF/6-311G*

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	O	-0.365
2	C	0.576
3	C	0.576
4	O	-0.375
5	O	-0.375
6	C	-0.294
7	C	-0.294
8	H	0.276
9	H	0.276

<r²>	167.068
(<r²>)^1/2	12.925

All results from a given calculation for C4H2O3 (Maleic Anhydride)

using model chemistry: HF/6-311G*

States and conformations

All results from a given calculation for C₄H₂O₃ (Maleic Anhydride)