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	hartrees
Energy at 0K	-379.334017
Energy at 298.15K	-379.337278
HF Energy	-379.334017
Nuclear repulsion energy	274.787365

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3264	3150	0.01
2	A₁	1900	1833	54.06
3	A₁	1645	1587	3.20
4	A₁	1269	1224	133.63
5	A₁	1076	1039	21.02
6	A₁	873	842	5.77
7	A₁	630	607	0.29
8	A₁	397	383	9.75
9	A₂	984	950	0.00
10	A₂	782	755	0.00
11	A₂	264	255	0.00
12	B₁	868	837	59.98
13	B₁	643	620	0.26
14	B₁	166	160	2.86
15	B₂	3241	3128	0.01
16	B₂	1840	1776	521.62
17	B₂	1327	1280	2.03
18	B₂	1048	1012	46.26
19	B₂	901	870	108.57
20	B₂	694	670	34.69
21	B₂	553	534	2.35

Atom	y (Å)	z (Å)
O1	0.000	0.961
C2	1.130	0.162
C3	-1.130	0.162
O4	2.237	0.605
O5	-2.237	0.605
C6	0.667	-1.262
C7	-0.667	-1.262
H8	1.364	-2.089
H9	-1.364	-2.089

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.3838	1.3838	2.2650	2.2650	2.3212	2.3212	3.3409	3.3409
C2	1.3838		2.2595	1.1926	3.3957	1.4972	2.2930	2.2628	3.3593
C3	1.3838	2.2595		3.3957	1.1926	2.2930	1.4972	3.3593	2.2628
O4	2.2650	1.1926	3.3957		4.4738	2.4393	3.4529	2.8317	4.4973
O5	2.2650	3.3957	1.1926	4.4738		3.4529	2.4393	4.4973	2.8317
C6	2.3212	1.4972	2.2930	2.4393	3.4529		1.3349	1.0810	2.1934
C7	2.3212	2.2930	1.4972	3.4529	2.4393	1.3349		2.1934	1.0810
H8	3.3409	2.2628	3.3593	2.8317	4.4973	1.0810	2.1934		2.7285
H9	3.3409	3.3593	2.2628	4.4973	2.8317	2.1934	1.0810	2.7285

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	122.906	O1	C2	C6	107.287
O1	C3	O5	122.906	O1	C3	C7	107.287
C2	O1	C3	109.456	C2	C6	C7	107.984
C2	C6	H8	121.884	C3	C7	C6	107.984
C3	C7	H9	121.884	O4	C2	C6	129.806
O5	C3	C7	129.806	C6	C7	H9	130.132
C7	C6	H8	130.132

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

using model chemistry: TPSSh/6-31G(2df,p)

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: TPSSh/6-31G(2df,p)

States and conformations

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