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	hartrees
Energy at 0K	-377.233865
Energy at 298.15K	-377.237497
HF Energy	-377.233865
Nuclear repulsion energy	278.621384

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3448	3112	1.14
2	A₁	2154	1944	108.03
3	A₁	1823	1645	1.25
4	A₁	1433	1293	233.90
5	A₁	1174	1060	14.16
6	A₁	956	863	6.08
7	A₁	697	629	0.32
8	A₁	445	401	20.00
9	A₂	1094	988	0.00
10	A₂	843	761	0.00
11	A₂	285	257	0.00
12	B₁	955	862	117.00
13	B₁	712	643	3.55
14	B₁	176	159	4.81
15	B₂	3426	3092	1.12
16	B₂	2074	1872	963.27
17	B₂	1464	1322	0.45
18	B₂	1214	1096	126.23
19	B₂	1056	953	80.52
20	B₂	776	700	19.73
21	B₂	608	549	1.31

Atom	y (Å)	z (Å)
O1	0.000	0.947
C2	1.114	0.167
C3	-1.114	0.167
O4	2.204	0.600
O5	-2.204	0.600
C6	0.659	-1.253
C7	-0.659	-1.253
H8	1.347	-2.073
H9	-1.347	-2.073

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.3600	1.3600	2.2309	2.2309	2.2963	2.2963	3.3069	3.3069
C2	1.3600		2.2279	1.1724	3.3456	1.4908	2.2709	2.2521	3.3275
C3	1.3600	2.2279		3.3456	1.1724	2.2709	1.4908	3.3275	2.2521
O4	2.2309	1.1724	3.3456		4.4072	2.4120	3.4091	2.8066	4.4438
O5	2.2309	3.3456	1.1724	4.4072		3.4091	2.4120	4.4438	2.8066
C6	2.2963	1.4908	2.2709	2.4120	3.4091		1.3170	1.0709	2.1666
C7	2.2963	2.2709	1.4908	3.4091	2.4120	1.3170		2.1666	1.0709
H8	3.3069	2.2521	3.3275	2.8066	4.4438	1.0709	2.1666		2.6934
H9	3.3069	3.3275	2.2521	4.4438	2.8066	2.1666	1.0709	2.6934

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	123.339	O1	C2	C6	107.222
O1	C3	O5	123.339	O1	C3	C7	107.222
C2	O1	C3	109.981	C2	C6	C7	107.788
C2	C6	H8	122.222	C3	C7	C6	107.788
C3	C7	H9	122.222	O4	C2	C6	129.439
O5	C3	C7	129.439	C6	C7	H9	129.990
C7	C6	H8	129.990

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

using model chemistry: HF/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	O	-0.614
2	C	0.787
3	C	0.787
4	O	-0.494
5	O	-0.494
6	C	-0.205
7	C	-0.205
8	H	0.219
9	H	0.219

<r²>	167.560
(<r²>)^1/2	12.944

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

using model chemistry: HF/6-31G**

States and conformations

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