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	hartrees
Energy at 0K	-378.888305
Energy at 298.15K
HF Energy	-378.888305
Nuclear repulsion energy	272.616094

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3209	3165	0.17
2	A₁	1858	1833	44.45
3	A₁	1613	1591	3.39
4	A₁	1235	1218	135.78
5	A₁	1044	1030	21.62
6	A₁	855	843	6.64
7	A₁	614	605	0.50
8	A₁	386	380	8.31
9	A₂	935	922	0.00
10	A₂	736	726	0.00
11	A₂	251	247	0.00
12	B₁	820	808	60.13
13	B₁	616	607	0.08
14	B₁	163	161	2.46
15	B₂	3188	3144	0.10
16	B₂	1802	1777	454.93
17	B₂	1290	1273	2.86
18	B₂	1021	1007	34.71
19	B₂	858	846	103.32
20	B₂	674	665	40.60
21	B₂	541	534	2.39

Atom	y (Å)	z (Å)
O1	0.000	0.982
C2	1.138	0.156
C3	-1.138	0.156
O4	2.262	0.601
O5	-2.262	0.601
C6	0.673	-1.262
C7	-0.673	-1.262
H8	1.370	-2.100
H9	-1.370	-2.100

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.4060	1.4060	2.2937	2.2937	2.3423	2.3423	3.3721	3.3721
C2	1.4060		2.2757	1.2089	3.4287	1.4921	2.2995	2.2673	3.3727
C3	1.4060	2.2757		3.4287	1.2089	2.2995	1.4921	3.3727	2.2673
O4	2.2937	1.2089	3.4287		4.5237	2.4485	3.4758	2.8440	4.5256
O5	2.2937	3.4287	1.2089	4.5237		3.4758	2.4485	4.5256	2.8440
C6	2.3423	1.4921	2.2995	2.4485	3.4758		1.3453	1.0898	2.2075
C7	2.3423	2.2995	1.4921	3.4758	2.4485	1.3453		2.2075	1.0898
H8	3.3721	2.2673	3.3727	2.8440	4.5256	1.0898	2.2075		2.7395
H9	3.3721	3.3727	2.2673	4.5256	2.8440	2.2075	1.0898	2.7395

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	122.426	O1	C2	C6	107.808
O1	C3	O5	122.426	O1	C3	C7	107.808
C2	O1	C3	108.052	C2	C6	C7	108.166
C2	C6	H8	122.068	C3	C7	C6	108.166
C3	C7	H9	122.068	O4	C2	C6	129.766
O5	C3	C7	129.766	C6	C7	H9	129.766
C7	C6	H8	129.766

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

using model chemistry: PBEPBE/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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Number	Element	Mulliken
1	O	-0.418
2	C	0.558
3	C	0.558
4	O	-0.386
5	O	-0.386
6	C	-0.117
7	C	-0.117
8	H	0.154
9	H	0.154

<r²>	172.933
(<r²>)^1/2	13.150

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

using model chemistry: PBEPBE/6-31G**

States and conformations

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