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	hartrees
Energy at 0K	-2613.857040
Energy at 298.15K	-2613.856578
HF Energy	-2613.857040
Nuclear repulsion energy	292.204559

Mode Number	Symmetry	Frequency (cm^-1)	Scaled Frequency (cm^-1)	IR Intensities (km mol^-1)
1	A₁'	836	828	0.00
2	A₂"	196	194	17.21
3	E'	953	944	20.10
3	E'	953	944	20.10
4	E'	335	332	16.89
4	E'	335	332	16.89

Atom	x (Å)	y (Å)
Se1	0.000	0.000
O2	0.000	1.679
O3	1.454	-0.839
O4	-1.454	-0.839

	Se1	O2	O3	O4
Se1		1.6785	1.6785	1.6785
O2	1.6785		2.9073	2.9073
O3	1.6785	2.9073		2.9073
O4	1.6785	2.9073	2.9073

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: PBEPBE/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	1.427
2	O	-0.476
3	O	-0.476
4	O	-0.476

<r²>	89.635
(<r²>)^1/2	9.468

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

using model chemistry: PBEPBE/3-21G

States and conformations

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