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	hartrees
Energy at 0K	-378.390192
Energy at 298.15K	-378.393447
HF Energy	-377.275609
Nuclear repulsion energy	272.770442

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3304	3202	1.17
2	A₁	1852	1795	46.94
3	A₁	1625	1575	3.67
4	A₁	1268	1229	130.61
5	A₁	1074	1041	18.16
6	A₁	875	848	8.52
7	A₁	623	603	0.50
8	A₁	397	385	9.07
9	A₂	952	922	0.00
10	A₂	773	749	0.00
11	A₂	265	257	0.00
12	B₁	848	822	64.14
13	B₁	634	615	0.00
14	B₁	162	157	2.67
15	B₂	3282	3181	1.44
16	B₂	1798	1743	531.88
17	B₂	1328	1287	0.03
18	B₂	1070	1037	86.51
19	B₂	883	856	185.17
20	B₂	697	676	48.11
21	B₂	556	539	8.18

Atom	y (Å)	z (Å)
O1	0.000	0.980
C2	1.136	0.157
C3	-1.136	0.157
O4	2.258	0.603
O5	-2.258	0.603
C6	0.676	-1.263
C7	-0.676	-1.263
H8	1.370	-2.102
H9	-1.370	-2.102

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.4032	1.4032	2.2892	2.2892	2.3425	2.3425	3.3723	3.3723
C2	1.4032		2.2725	1.2072	3.4235	1.4926	2.3018	2.2703	3.3735
C3	1.4032	2.2725		3.4235	1.2072	2.3018	1.4926	3.3735	2.2703
O4	2.2892	1.2072	3.4235		4.5159	2.4467	3.4767	2.8466	4.5251
O5	2.2892	3.4235	1.2072	4.5159		3.4767	2.4467	4.5251	2.8466
C6	2.3425	1.4926	2.3018	2.4467	3.4767		1.3511	1.0887	2.2107
C7	2.3425	2.3018	1.4926	3.4767	2.4467	1.3511		2.2107	1.0887
H8	3.3723	2.2703	3.3735	2.8466	4.5251	1.0887	2.2107		2.7399
H9	3.3723	3.3735	2.2703	4.5251	2.8466	2.2107	1.0887	2.7399

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	122.378	O1	C2	C6	107.944
O1	C3	O5	122.378	O1	C3	C7	107.944
C2	O1	C3	108.151	C2	C6	C7	107.980
C2	C6	H8	122.391	C3	C7	C6	107.980
C3	C7	H9	122.391	O4	C2	C6	129.678
O5	C3	C7	129.678	C6	C7	H9	129.629
C7	C6	H8	129.629

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

using model chemistry: MP2=FULL/aug-cc-pVDZ

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: MP2=FULL/aug-cc-pVDZ

States and conformations

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