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	hartrees
Energy at 0K	-378.755263
Energy at 298.15K	-378.758637
HF Energy	-377.365664
Nuclear repulsion energy	276.066505

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3324	3155	1.64
2	A₁	1900	1804	46.07
3	A₁	1650	1567	4.00
4	A₁	1293	1228	143.33
5	A₁	1091	1036	20.38
6	A₁	891	846	5.95
7	A₁	639	607	0.28
8	A₁	410	389	9.24
9	A₂	1008	957	0.00
10	A₂	797	757	0.00
11	A₂	272	258	0.00
12	B₁	883	838	65.76
13	B₁	657	624	0.00
14	B₁	168	160	2.58
15	B₂	3297	3130	1.73
16	B₂	1844	1750	484.87
17	B₂	1353	1285	0.42
18	B₂	1085	1030	95.67
19	B₂	926	879	156.62
20	B₂	714	678	37.27
21	B₂	570	541	5.72

Atom	y (Å)	z (Å)
O1	0.000	0.967
C2	1.123	0.157
C3	-1.123	0.157
O4	2.233	0.595
O5	-2.233	0.595
C6	0.665	-1.249
C7	-0.665	-1.249
H8	1.348	-2.075
H9	-1.348	-2.075

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.3850	1.3850	2.2634	2.2634	2.3139	2.3139	3.3279	3.3279
C2	1.3850		2.2458	1.1932	3.3840	1.4781	2.2745	2.2432	3.3297
C3	1.3850	2.2458		3.3840	1.1932	2.2745	1.4781	3.3297	2.2432
O4	2.2634	1.1932	3.3840		4.4651	2.4201	3.4349	2.8132	4.4668
O5	2.2634	3.3840	1.1932	4.4651		3.4349	2.4201	4.4668	2.8132
C6	2.3139	1.4781	2.2745	2.4201	3.4349		1.3307	1.0719	2.1764
C7	2.3139	2.2745	1.4781	3.4349	2.4201	1.3307		2.1764	1.0719
H8	3.3279	2.2432	3.3297	2.8132	4.4668	1.0719	2.1764		2.6960
H9	3.3279	3.3297	2.2432	4.4668	2.8132	2.1764	1.0719	2.6960

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	122.605	O1	C2	C6	107.798
O1	C3	O5	122.605	O1	C3	C7	107.798
C2	O1	C3	108.341	C2	C6	C7	108.031
C2	C6	H8	122.412	C3	C7	C6	108.031
C3	C7	H9	122.412	O4	C2	C6	129.597
O5	C3	C7	129.597	C6	C7	H9	129.557
C7	C6	H8	129.557

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

using model chemistry: MP2=FULL/cc-pVTZ

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-pVTZ

States and conformations

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