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| Titel |
Ultraviolet Spectroscopy of 32S, 33S, 34S and 36S Sulfur Dioxide: Absorption Cross Sections at 190-220 nm and the isotopic fractionations in the photodissociation reaction. |
| VerfasserIn |
Sebastian Danielache, Shohei Hattori, Matthew Johnson, Yuichiro Ueno, Naohiro Yoshida |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250050306
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| Zusammenfassung |
| We report measurements of the ultraviolet absorption cross sections of 32SO2, 33SO2,34SO2
and 36SO2, recorded using a Bruker vacuum Fourier-transform spectrometer from
52,500 to 45,500 cm-1 (190 to 220 nm) at 293 K with a resolution of 8 cm-1. The
samples were produced by combustion of isotopically enriched 32S, 33S,34S and 36S
elemental Sulfur. The spectrum of the 32S, 33S and34S samples are in agreement
with previously published spectra. We conclude that the main source of error is the
standard deviation of the measurements themselves while the root-mean-square
of other sources of error is in average 20%.The spectra of the isotopically pure
species were corrected based on the isotopic composition of the samples used for
the measurements. The 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. Also the analysis of the obtained spectra
showed that most of the potential mass independent fractionation factors observed during
photolysis is product of the combination in change of absorption cross sections and the
amount of red shifting of the heavier isotopologues as suggested by our previous
measurements. |
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