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	hartrees
Energy at 0K	-378.290430
Energy at 298.15K	-378.293645
HF Energy	-377.226650
Nuclear repulsion energy	273.927081

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3354	3134	0.85
2	A₁	1908	1783	39.62
3	A₁	1665	1556	3.29
4	A₁	1296	1211	152.30
5	A₁	1102	1030	22.25
6	A₁	886	827	7.77
7	A₁	632	591	0.22
8	A₁	399	373	10.07
9	A₂	946	884	0.00
10	A₂	736	688	0.00
11	A₂	243	227	0.00
12	B₁	844	788	73.64
13	B₁	634	592	0.71
14	B₁	163	153	2.29
15	B₂	3333	3115	1.24
16	B₂	1853	1732	412.80
17	B₂	1367	1278	0.36
18	B₂	1092	1020	89.73
19	B₂	916	856	151.32
20	B₂	709	663	33.17
21	B₂	560	523	5.26

Atom	y (Å)	z (Å)
O1	0.000	0.974
C2	1.132	0.156
C3	-1.132	0.156
O4	2.254	0.598
O5	-2.254	0.598
C6	0.669	-1.255
C7	-0.669	-1.255
H8	1.354	-2.086
H9	-1.354	-2.086

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.3967	1.3967	2.2851	2.2851	2.3280	2.3280	3.3469	3.3469
C2	1.3967		2.2645	1.2054	3.4148	1.4859	2.2888	2.2538	3.3486
C3	1.3967	2.2645		3.4148	1.2054	2.2888	1.4859	3.3486	2.2538
O4	2.2851	1.2054	3.4148		4.5078	2.4385	3.4611	2.8310	4.4971
O5	2.2851	3.4148	1.2054	4.5078		3.4611	2.4385	4.4971	2.8310
C6	2.3280	1.4859	2.2888	2.4385	3.4611		1.3384	1.0769	2.1874
C7	2.3280	2.2888	1.4859	3.4611	2.4385	1.3384		2.1874	1.0769
H8	3.3469	2.2538	3.3486	2.8310	4.4971	1.0769	2.1874		2.7085
H9	3.3469	3.3486	2.2538	4.4971	2.8310	2.1874	1.0769	2.7085

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	122.674	O1	C2	C6	107.683
O1	C3	O5	122.674	O1	C3	C7	107.683
C2	O1	C3	108.318	C2	C6	C7	108.158
C2	C6	H8	122.339	C3	C7	C6	108.158
C3	C7	H9	122.339	O4	C2	C6	129.643
O5	C3	C7	129.643	C6	C7	H9	129.502
C7	C6	H8	129.502

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

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

States and conformations

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