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	hartrees
Energy at 0K	-379.238346
Energy at 298.15K	-379.241401
HF Energy	-379.238346
Nuclear repulsion energy	271.230116

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3190	3173	0.05
2	A₁	1805	1796	48.20
3	A₁	1587	1578	2.68
4	A₁	1196	1190	124.13
5	A₁	1049	1044	29.95
6	A₁	833	828	7.41
7	A₁	604	601	1.33
8	A₁	379	377	7.71
9	A₂	938	933	0.00
10	A₂	729	725	0.00
11	A₂	256	255	0.00
12	B₁	818	814	63.62
13	B₁	610	607	0.09
14	B₁	162	161	2.84
15	B₂	3171	3154	0.03
16	B₂	1749	1740	593.40
17	B₂	1291	1284	2.64
18	B₂	1009	1003	25.98
19	B₂	813	808	121.83
20	B₂	660	657	76.10
21	B₂	534	531	6.72

Atom	y (Å)	z (Å)
O1	0.000	0.990
C2	1.147	0.155
C3	-1.147	0.155
O4	2.275	0.601
O5	-2.275	0.601
C6	0.675	-1.266
C7	-0.675	-1.266
H8	1.370	-2.104
H9	-1.370	-2.104

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.4191	1.4191	2.3080	2.3080	2.3551	2.3551	3.3841	3.3841
C2	1.4191		2.2948	1.2127	3.4514	1.4978	2.3108	2.2702	3.3825
C3	1.4191	2.2948		3.4514	1.2127	2.3108	1.4978	3.3825	2.2702
O4	2.3080	1.2127	3.4514		4.5501	2.4594	3.4911	2.8528	4.5393
O5	2.3080	3.4514	1.2127	4.5501		3.4911	2.4594	4.5393	2.8528
C6	2.3551	1.4978	2.3108	2.4594	3.4911		1.3492	1.0889	2.2097
C7	2.3551	2.3108	1.4978	3.4911	2.4594	1.3492		2.2097	1.0889
H8	3.3841	2.2702	3.3825	2.8528	4.5393	1.0889	2.2097		2.7399
H9	3.3841	3.3825	2.2702	4.5393	2.8528	2.2097	1.0889	2.7399

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	122.363	O1	C2	C6	107.650
O1	C3	O5	122.363	O1	C3	C7	107.650
C2	O1	C3	107.901	C2	C6	C7	108.399
C2	C6	H8	121.916	C3	C7	C6	108.399
C3	C7	H9	121.916	O4	C2	C6	129.986
O5	C3	C7	129.986	C6	C7	H9	129.684
C7	C6	H8	129.684

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

using model chemistry: BLYP/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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Number	Element	Mulliken
1	O	-0.316
2	C	0.339
3	C	0.339
4	O	-0.432
5	O	-0.432
6	C	0.094
7	C	0.094
8	H	0.157
9	H	0.157

<r²>	175.690
(<r²>)^1/2	13.255

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

using model chemistry: BLYP/6-31+G**

States and conformations

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