[1] We report measurements of the ultraviolet absorption cross sections of 32SO2, 33SO2,
and 34SO2, recorded from 30,300 to 52,500 cm1 (330 to 190 nm) at 293 K
with a resolution of 25 cm1. The 33SO2 sample was produced by the combustion
of isotopically enriched 33S while the 34SO2 and natural abundance samples were obtained
from commercial manufacturers. The spectrum of the natural abundance sample
is in agreement with previously published spectra. The spectra of the isotopically
pure species were retrieved using the isotopic composition of the samples.
The 32SO2, 33SO2, and 34SO2 absorption spectra show rich vibrational structure,
and the positions and widths of the peaks change with isotopic substitution in a complex
fashion. The results imply that large wavelength-dependent and broadband isotopic
fractionations are associated with the UV photolysis of SO2.
Udgivelsesdato: 13 September 2008