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	hartrees
Energy at 0K	-2611.557361
Energy at 298.15K	-2611.557085
HF Energy	-2611.557361
Nuclear repulsion energy	302.377708

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁'	926	838	0.00
2	A₂"	235	213	62.37
3	E'	995	901	28.23
3	E'	995	901	28.23
4	E'	377	341	41.97
4	E'	377	341	41.97

Atom	x (Å)	y (Å)
Se1	0.000	0.000
O2	0.000	1.622
O3	1.405	-0.811
O4	-1.405	-0.811

	Se1	O2	O3	O4
Se1		1.6220	1.6220	1.6220
O2	1.6220		2.8095	2.8095
O3	1.6220	2.8095		2.8095
O4	1.6220	2.8095	2.8095

atom1	atom2	atom3	angle		atom1	atom2	atom3	angle
O2	Se1	O3	120.000		O2	Se1	O4	120.000
O3	Se1	O4	120.000

All results from a given calculation for SeO₃ (selenium trioxide)

using model chemistry: HF/3-21G

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	Se	2.055
2	O	-0.685
3	O	-0.685
4	O	-0.685

<r²>	86.199
(<r²>)^1/2	9.284

All results from a given calculation for SeO3 (selenium trioxide)

using model chemistry: HF/3-21G

States and conformations

All results from a given calculation for SeO₃ (selenium trioxide)