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	hartrees
Energy at 0K	-377.243235
Energy at 298.15K	-377.246856
HF Energy	-377.243235
Nuclear repulsion energy	278.512502

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3446	3116	1.78
2	A₁	2134	1930	109.52
3	A₁	1813	1639	0.70
4	A₁	1425	1289	224.88
5	A₁	1175	1062	14.61
6	A₁	955	864	5.80
7	A₁	695	629	0.44
8	A₁	444	402	19.92
9	A₂	1083	979	0.00
10	A₂	832	752	0.00
11	A₂	283	256	0.00
12	B₁	948	857	119.67
13	B₁	710	642	1.73
14	B₁	174	157	4.70
15	B₂	3424	3096	1.49
16	B₂	2053	1856	1098.62
17	B₂	1462	1322	0.12
18	B₂	1212	1096	138.42
19	B₂	1054	953	96.95
20	B₂	775	701	22.27
21	B₂	608	549	1.93

Atom	y (Å)	z (Å)
O1	0.000	0.948
C2	1.114	0.167
C3	-1.114	0.167
O4	2.204	0.600
O5	-2.204	0.600
C6	0.659	-1.253
C7	-0.659	-1.253
H8	1.348	-2.073
H9	-1.348	-2.073

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.3601	1.3601	2.2313	2.2313	2.2977	2.2977	3.3083	3.3083
C2	1.3601		2.2274	1.1732	3.3459	1.4913	2.2717	2.2525	3.3287
C3	1.3601	2.2274		3.3459	1.1732	2.2717	1.4913	3.3287	2.2525
O4	2.2313	1.1732	3.3459		4.4082	2.4128	3.4108	2.8069	4.4460
O5	2.2313	3.3459	1.1732	4.4082		3.4108	2.4128	4.4460	2.8069
C6	2.2977	1.4913	2.2717	2.4128	3.4108		1.3185	1.0710	2.1686
C7	2.2977	2.2717	1.4913	3.4108	2.4128	1.3185		2.1686	1.0710
H8	3.3083	2.2525	3.3287	2.8069	4.4460	1.0710	2.1686		2.6967
H9	3.3083	3.3287	2.2525	4.4460	2.8069	2.1686	1.0710	2.6967

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	123.306	O1	C2	C6	107.289
O1	C3	O5	123.306	O1	C3	C7	107.289
C2	O1	C3	109.936	C2	C6	C7	107.743
C2	C6	H8	122.211	C3	C7	C6	107.743
C3	C7	H9	122.211	O4	C2	C6	129.405
O5	C3	C7	129.405	C6	C7	H9	130.046
C7	C6	H8	130.046

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

using model chemistry: HF/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	-0.515
2	C	0.533
3	C	0.533
4	O	-0.524
5	O	-0.524
6	C	0.021
7	C	0.021
8	H	0.228
9	H	0.228

<r²>	168.167
(<r²>)^1/2	12.968

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

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

States and conformations

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