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	hartrees
Energy at 0K	-377.261237
Energy at 298.15K	-377.264900
HF Energy	-377.261237
Nuclear repulsion energy	278.674863

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁	3438	3121	1.71
2	A₁	2143	1946	119.63
3	A₁	1815	1648	1.16
4	A₁	1436	1304	237.81
5	A₁	1149	1043	12.90
6	A₁	960	871	6.18
7	A₁	695	631	0.60
8	A₁	447	406	18.73
9	A₂	1089	989	0.00
10	A₂	864	784	0.00
11	A₂	288	262	0.00
12	B₁	963	874	108.21
13	B₁	717	651	1.57
14	B₁	177	161	4.17
15	B₂	3414	3100	1.12
16	B₂	2065	1875	1006.10
17	B₂	1446	1313	0.02
18	B₂	1205	1094	133.18
19	B₂	1052	955	75.02
20	B₂	776	705	21.31
21	B₂	608	552	1.15

Atom	y (Å)	z (Å)
O1	0.000	0.948
C2	1.113	0.168
C3	-1.113	0.168
O4	2.200	0.600
O5	-2.200	0.600
C6	0.660	-1.254
C7	-0.660	-1.254
H8	1.354	-2.078
H9	-1.354	-2.078

	O1	C2	C3	O4	O5	C6	C7	H8	H9
O1		1.3592	1.3592	2.2274	2.2274	2.2989	2.2989	3.3158	3.3158
C2	1.3592		2.2251	1.1703	3.3407	1.4914	2.2722	2.2588	3.3359
C3	1.3592	2.2251		3.3407	1.1703	2.2722	1.4914	3.3359	2.2588
O4	2.2274	1.1703	3.3407		4.4000	2.4097	3.4084	2.8087	4.4503
O5	2.2274	3.3407	1.1703	4.4000		3.4084	2.4097	4.4503	2.8087
C6	2.2989	1.4914	2.2722	2.4097	3.4084		1.3205	1.0777	2.1767
C7	2.2989	2.2722	1.4914	3.4084	2.4097	1.3205		2.1767	1.0777
H8	3.3158	2.2588	3.3359	2.8087	4.4503	1.0777	2.1767		2.7083
H9	3.3158	3.3359	2.2588	4.4503	2.8087	2.1767	1.0777	2.7083

atom1	atom2	atom3	angle	atom1	atom2	atom3	angle
O1	C2	O4	123.252	O1	C2	C6	107.410
O1	C3	O5	123.252	O1	C3	C7	107.410
C2	O1	C3	109.873	C2	C6	C7	107.653
C2	C6	H8	122.270	C3	C7	C6	107.653
C3	C7	H9	122.270	O4	C2	C6	129.338
O5	C3	C7	129.338	C6	C7	H9	130.077
C7	C6	H8	130.077

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

using model chemistry: HF/cc-pVDZ

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	-0.357
2	C	0.435
3	C	0.435
4	O	-0.270
5	O	-0.270
6	C	-0.060
7	C	-0.060
8	H	0.073
9	H	0.073

<r²>	167.420
(<r²>)^1/2	12.939

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

using model chemistry: HF/cc-pVDZ

States and conformations

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