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	hartrees
Energy at 0K	-372.274614
Energy at 298.15K	-372.277840
HF Energy	-372.274614
Nuclear repulsion energy	271.812454

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3782	3088	17.78
2	A₁	2175	1776	12.59
3	A₁	1968	1607	2.64
4	A₁	1439	1175	108.39
5	A₁	1230	1004	5.50
6	A₁	960	783	2.27
7	A₁	712	581	0.09
8	A₁	427	348	16.40
9	A₂	1172	957	0.00
10	A₂	808	660	0.00
11	A₂	302	247	0.00
12	B₁	959	783	43.06
13	B₁	651	532	8.55
14	B₁	152	124	0.92
15	B₂	3743	3057	65.85
16	B₂	2107	1720	218.12
17	B₂	1547	1263	0.01
18	B₂	1347	1100	95.52
19	B₂	1069	873	19.76
20	B₂	803	656	1.46
21	B₂	596	487	0.37

Atom	y (Å)	z (Å)
O1	0.000	0.994
C2	1.137	0.161
C3	-1.137	0.161
O4	2.264	0.608
O5	-2.264	0.608
C6	0.656	-1.281
C7	-0.656	-1.281
H8	1.341	-2.117
H9	-1.341	-2.117

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.4098	1.4098	2.2963	2.2963	2.3675	2.3675	3.3876	3.3876
C2	1.4098		2.2742	1.2120	3.4299	1.5196	2.3004	2.2864	3.3658
C3	1.4098	2.2742		3.4299	1.2120	2.3004	1.5196	3.3658	2.2864
O4	2.2963	1.2120	3.4299		4.5271	2.4803	3.4769	2.8763	4.5186
O5	2.2963	3.4299	1.2120	4.5271		3.4769	2.4803	4.5186	2.8763
C6	2.3675	1.5196	2.3004	2.4803	3.4769		1.3115	1.0811	2.1649
C7	2.3675	2.3004	1.5196	3.4769	2.4803	1.3115		2.1649	1.0811
H8	3.3876	2.2864	3.3658	2.8763	4.5186	1.0811	2.1649		2.6827
H9	3.3876	3.3658	2.2864	4.5186	2.8763	2.1649	1.0811	2.6827

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	122.107	O1	C2	C6	107.774
O1	C3	O5	122.107	O1	C3	C7	107.774
C2	O1	C3	107.517	C2	C6	C7	108.468
C2	C6	H8	122.173	C3	C7	C6	108.468
C3	C7	H9	122.173	O4	C2	C6	130.119
O5	C3	C7	130.119	C6	C7	H9	129.359
C7	C6	H8	129.359

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

using model chemistry: HF/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	O	-0.248
2	C	0.314
3	C	0.314
4	O	-0.215
5	O	-0.215
6	C	-0.076
7	C	-0.076
8	H	0.101
9	H	0.101

<r²>	172.156
(<r²>)^1/2	13.121

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

using model chemistry: HF/STO-3G

States and conformations

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