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	hartrees
Energy at 0K	-379.182112
Energy at 298.15K	-379.185405
HF Energy	-379.182112
Nuclear repulsion energy	275.977986

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3308	3164	1.40
2	A₁	1951	1866	62.36
3	A₁	1691	1617	3.32
4	A₁	1305	1248	167.46
5	A₁	1082	1036	18.72
6	A₁	898	859	6.04
7	A₁	640	612	0.38
8	A₁	406	388	11.92
9	A₂	982	939	0.00
10	A₂	762	729	0.00
11	A₂	260	248	0.00
12	B₁	856	819	78.00
13	B₁	643	615	0.12
14	B₁	165	157	3.26
15	B₂	3287	3144	1.05
16	B₂	1888	1806	721.88
17	B₂	1343	1284	0.97
18	B₂	1088	1041	88.76
19	B₂	949	908	122.79
20	B₂	708	677	30.71
21	B₂	566	541	2.70

Atom	y (Å)	z (Å)
O1	0.000	0.963
C2	1.121	0.159
C3	-1.121	0.159
O4	2.230	0.599
O5	-2.230	0.599
C6	0.666	-1.253
C7	-0.666	-1.253
H8	1.359	-2.081
H9	-1.359	-2.081

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.3803	1.3803	2.2600	2.2600	2.3146	2.3146	3.3337	3.3337
C2	1.3803		2.2425	1.1937	3.3806	1.4836	2.2773	2.2517	3.3417
C3	1.3803	2.2425		3.3806	1.1937	2.2773	1.4836	3.3417	2.2517
O4	2.2600	1.1937	3.3806		4.4610	2.4253	3.4380	2.8181	4.4799
O5	2.2600	3.3806	1.1937	4.4610		3.4380	2.4253	4.4799	2.8181
C6	2.3146	1.4836	2.2773	2.4253	3.4380		1.3311	1.0796	2.1873
C7	2.3146	2.2773	1.4836	3.4380	2.4253	1.3311		2.1873	1.0796
H8	3.3337	2.2517	3.3417	2.8181	4.4799	1.0796	2.1873		2.7186
H9	3.3337	3.3417	2.2517	4.4799	2.8181	2.1873	1.0796	2.7186

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	122.645	O1	C2	C6	107.786
O1	C3	O5	122.645	O1	C3	C7	107.786
C2	O1	C3	108.651	C2	C6	C7	107.888
C2	C6	H8	122.127	C3	C7	C6	107.888
C3	C7	H9	122.127	O4	C2	C6	129.569
O5	C3	C7	129.569	C6	C7	H9	129.985
C7	C6	H8	129.985

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

using model chemistry: B1B95/6-31+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	-0.331
2	C	0.335
3	C	0.335
4	O	-0.449
5	O	-0.449
6	C	0.081
7	C	0.081
8	H	0.198
9	H	0.198

<r²>	170.120
(<r²>)^1/2	13.043

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

using model chemistry: B1B95/6-31+G**

States and conformations

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