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	hartrees
Energy at 0K	-375.103514
Energy at 298.15K	-375.107165
HF Energy	-375.103514
Nuclear repulsion energy	275.373482

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3479	3140	3.02
2	A₁	2099	1895	65.70
3	A₁	1807	1631	0.86
4	A₁	1321	1192	155.49
5	A₁	1189	1073	74.77
6	A₁	897	810	3.13
7	A₁	694	627	0.16
8	A₁	427	386	16.22
9	A₂	1175	1060	0.00
10	A₂	846	763	0.00
11	A₂	322	290	0.00
12	B₁	1006	908	158.73
13	B₁	720	650	5.61
14	B₁	186	168	1.63
15	B₂	3455	3118	4.25
16	B₂	2012	1816	657.00
17	B₂	1465	1322	7.27
18	B₂	1135	1024	95.40
19	B₂	1002	904	75.65
20	B₂	782	706	20.12
21	B₂	590	532	2.53

Atom	y (Å)	z (Å)
O1	0.000	0.958
C2	1.141	0.163
C3	-1.141	0.163
O4	2.243	0.601
O5	-2.243	0.601
C6	0.658	-1.255
C7	-0.658	-1.255
H8	1.329	-2.082
H9	-1.329	-2.082

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.3903	1.3903	2.2710	2.2710	2.3089	2.3089	3.3176	3.3176
C2	1.3903		2.2811	1.1861	3.4116	1.4980	2.2903	2.2525	3.3375
C3	1.3903	2.2811		3.4116	1.1861	2.2903	1.4980	3.3375	2.2525
O4	2.2710	1.1861	3.4116		4.4856	2.4407	3.4437	2.8338	4.4673
O5	2.2710	3.4116	1.1861	4.4856		3.4437	2.4407	4.4673	2.8338
C6	2.3089	1.4980	2.2903	2.4407	3.4437		1.3159	1.0649	2.1524
C7	2.3089	2.2903	1.4980	3.4437	2.4407	1.3159		2.1524	1.0649
H8	3.3176	2.2525	3.3375	2.8338	4.4673	1.0649	2.1524		2.6589
H9	3.3176	3.3375	2.2525	4.4673	2.8338	2.1524	1.0649	2.6589

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	123.449	O1	C2	C6	106.084
O1	C3	O5	123.449	O1	C3	C7	106.084
C2	O1	C3	110.241	C2	C6	C7	108.795
C2	C6	H8	122.110	C3	C7	C6	108.795
C3	C7	H9	122.110	O4	C2	C6	130.467
O5	C3	C7	130.467	C6	C7	H9	129.094
C7	C6	H8	129.094

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

using model chemistry: HF/3-21G*

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	-0.706
2	C	0.892
3	C	0.892
4	O	-0.544
5	O	-0.544
6	C	-0.307
7	C	-0.307
8	H	0.312
9	H	0.312

<r²>	171.790
(<r²>)^1/2	13.107

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

using model chemistry: HF/3-21G*

States and conformations

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