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	hartrees
Energy at 0K	-378.314435
Energy at 298.15K	-378.317601
HF Energy	-377.235415
Nuclear repulsion energy	273.603012

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3346	3143	1.35
2	A₁	1875	1761	40.11
3	A₁	1653	1552	3.13
4	A₁	1281	1203	144.47
5	A₁	1100	1033	24.36
6	A₁	882	828	8.40
7	A₁	628	590	0.62
8	A₁	397	373	9.62
9	A₂	930	874	0.00
10	A₂	702	660	0.00
11	A₂	239	224	0.00
12	B₁	825	775	77.99
13	B₁	627	589	0.14
14	B₁	157	148	2.27
15	B₂	3326	3124	1.66
16	B₂	1821	1710	529.80
17	B₂	1362	1280	0.06
18	B₂	1088	1022	94.03
19	B₂	905	850	189.32
20	B₂	708	665	42.98
21	B₂	557	523	7.86

Atom	y (Å)	z (Å)
O1	0.000	0.976
C2	1.133	0.156
C3	-1.133	0.156
O4	2.257	0.599
O5	-2.257	0.599
C6	0.670	-1.257
C7	-0.670	-1.257
H8	1.357	-2.087
H9	-1.357	-2.087

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.3989	1.3989	2.2879	2.2879	2.3310	2.3310	3.3503	3.3503
C2	1.3989		2.2661	1.2077	3.4184	1.4859	2.2905	2.2538	3.3511
C3	1.3989	2.2661		3.4184	1.2077	2.2905	1.4859	3.3511	2.2538
O4	2.2879	1.2077	3.4184		4.5130	2.4407	3.4654	2.8323	4.5023
O5	2.2879	3.4184	1.2077	4.5130		3.4654	2.4407	4.5023	2.8323
C6	2.3310	1.4859	2.2905	2.4407	3.4654		1.3410	1.0776	2.1911
C7	2.3310	2.2905	1.4859	3.4654	2.4407	1.3410		2.1911	1.0776
H8	3.3503	2.2538	3.3511	2.8323	4.5023	1.0776	2.1911		2.7141
H9	3.3503	3.3511	2.2538	4.5023	2.8323	2.1911	1.0776	2.7141

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	122.568	O1	C2	C6	107.770
O1	C3	O5	122.568	O1	C3	C7	107.770
C2	O1	C3	108.183	C2	C6	C7	108.138
C2	C6	H8	122.285	C3	C7	C6	108.138
C3	C7	H9	122.285	O4	C2	C6	129.662
O5	C3	C7	129.662	C6	C7	H9	129.577
C7	C6	H8	129.577

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

using model chemistry: MP2=FULL/6-31+G**

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/6-31+G**

States and conformations

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