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	hartrees
Energy at 0K	-378.312575
Energy at 298.15K	-378.315842
HF Energy	-377.253667
Nuclear repulsion energy	273.485994

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3314	3150	1.12
2	A₁	1903	1809	45.28
3	A₁	1644	1563	3.34
4	A₁	1294	1230	159.20
5	A₁	1063	1011	18.54
6	A₁	885	841	6.42
7	A₁	629	598	0.37
8	A₁	403	383	9.15
9	A₂	964	916	0.00
10	A₂	772	733	0.00
11	A₂	255	242	0.00
12	B₁	857	815	67.27
13	B₁	642	610	0.04
14	B₁	163	155	1.81
15	B₂	3292	3128	1.14
16	B₂	1849	1757	430.90
17	B₂	1333	1267	0.02
18	B₂	1071	1018	99.24
19	B₂	914	869	142.01
20	B₂	704	669	34.86
21	B₂	559	532	4.99

Atom	y (Å)	z (Å)
O1	0.000	0.976
C2	1.132	0.160
C3	-1.132	0.160
O4	2.250	0.602
O5	-2.250	0.602
C6	0.674	-1.263
C7	-0.674	-1.263
H8	1.370	-2.101
H9	-1.370	-2.101

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.3950	1.3950	2.2813	2.2813	2.3379	2.3379	3.3684	3.3684
C2	1.3950		2.2638	1.2025	3.4110	1.4951	2.2994	2.2743	3.3729
C3	1.3950	2.2638		3.4110	1.2025	2.2994	1.4951	3.3729	2.2743
O4	2.2813	1.2025	3.4110		4.5009	2.4418	3.4684	2.8430	4.5186
O5	2.2813	3.4110	1.2025	4.5009		3.4684	2.4418	4.5186	2.8430
C6	2.3379	1.4951	2.2994	2.4418	3.4684		1.3481	1.0899	2.2096
C7	2.3379	2.2994	1.4951	3.4684	2.4418	1.3481		2.2096	1.0899
H8	3.3684	2.2743	3.3729	2.8430	4.5186	1.0899	2.2096		2.7406
H9	3.3684	3.3729	2.2743	4.5186	2.8430	2.2096	1.0899	2.7406

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	122.689	O1	C2	C6	107.935
O1	C3	O5	122.689	O1	C3	C7	107.935
C2	O1	C3	108.464	C2	C6	C7	107.833
C2	C6	H8	122.463	C3	C7	C6	107.833
C3	C7	H9	122.463	O4	C2	C6	129.376
O5	C3	C7	129.376	C6	C7	H9	129.704
C7	C6	H8	129.704

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

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

States and conformations

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