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	hartrees
Energy at 0K	-378.268874
Energy at 298.15K
HF Energy	-377.223998
Nuclear repulsion energy	273.899401

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3296	3139	0.45
2	A₁	1952	1859	57.24
3	A₁	1688	1607	1.83
4	A₁	1312	1250	156.02
5	A₁	1102	1049	20.10
6	A₁	888	846	6.54
7	A₁	640	610	0.28
8	A₁	403	384	12.48
9	A₂	931	887	0.00
10	A₂	737	702	0.00
11	A₂	245	234	0.00
12	B₁	839	799	85.79
13	B₁	632	602	0.65
14	B₁	161	153	2.75
15	B₂	3276	3120	0.51
16	B₂	1884	1794	554.61
17	B₂	1361	1296	0.13
18	B₂	1113	1060	110.31
19	B₂	940	895	127.63
20	B₂	717	683	28.25
21	B₂	562	536	3.67

Atom	y (Å)	z (Å)
O1	0.000	0.972
C2	1.133	0.160
C3	-1.133	0.160
O4	2.249	0.602
O5	-2.249	0.602
C6	0.669	-1.261
C7	-0.669	-1.261
H8	1.362	-2.094
H9	-1.362	-2.094

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.3940	1.3940	2.2796	2.2796	2.3314	2.3314	3.3555	3.3555
C2	1.3940		2.2655	1.2010	3.4109	1.4948	2.2945	2.2657	3.3626
C3	1.3940	2.2655		3.4109	1.2010	2.2945	1.4948	3.3626	2.2657
O4	2.2796	1.2010	3.4109		4.4986	2.4433	3.4623	2.8385	4.5073
O5	2.2796	3.4109	1.2010	4.4986		3.4623	2.4433	4.5073	2.8385
C6	2.3314	1.4948	2.2945	2.4433	3.4623		1.3376	1.0841	2.1955
C7	2.3314	2.2945	1.4948	3.4623	2.4433	1.3376		2.1955	1.0841
H8	3.3555	2.2657	3.3626	2.8385	4.5073	1.0841	2.1955		2.7249
H9	3.3555	3.3626	2.2657	4.5073	2.8385	2.1955	1.0841	2.7249

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	122.740	O1	C2	C6	107.567
O1	C3	O5	122.740	O1	C3	C7	107.567
C2	O1	C3	108.703	C2	C6	C7	108.082
C2	C6	H8	122.137	C3	C7	C6	108.082
C3	C7	H9	122.137	O4	C2	C6	129.694
O5	C3	C7	129.694	C6	C7	H9	129.781
C7	C6	H8	129.781

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

using model chemistry: QCISD/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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All results from a given calculation for C4H2O3 (Maleic Anhydride)

using model chemistry: QCISD/6-31G*

States and conformations

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