In database:

440-6500 cm-1

140-330 nm

Sulfur trioxide (SO₃)
Molecular weight 80.0582 g/mole
Freezing point 16.8 C
Boiling point 44.8 C

Infrared cross-sections from PNNL
FTIR infrared cross-sections from 440 to 6500 cm^-1
Data available at 25 C C
Spectra is composite of on the order of 10 different pressures,backfilled with nitrogen to 760 T.
Composite spectrum was created by appending data from mid-band MCT and wide-band-MCT detectors. Multiple spectral features due to reaction of windows (AgCl) with SO3. Removed “window” features by subtraction of selected “deviation” vector regions. Residual still observable in composite spectrum as “derivative” shaped features.
Images of PNNL data in wavenumbers
Images of PNNL data in microns

UV cross-sections
Please see The MPI-Mainz UV/VIS Spectral Atlas

Other references

Notes
n₁ 1065 cm^-1 (a₁') symmetric stretch
n₂ 498 cm^-1 (a₂') out of plane deform
n₃ 1391 cm^-1 (e') degenerate stretch
n₄ 530 cm^-1 (e') degenerate stretch




List of available data for all molecules in database
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