Molecular Photoabsorption Cross Sections In The Ultraviolet: N2, SO2, S2, CO2

Details Molecular Photoabsorption Cross Sections In The Ultraviolet: N2, SO2, S2, CO2 Molecular Photoabsorption Cross Sections In The Ultraviolet: N2, SO2, S2, CO2

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21813404s&link_type=abstract

American Astronomical Society, AAS Meeting #218, #134.04; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

Our research program focuses on the measurement of ultraviolet molecular photoabsorption cross sections with the highest practical resolution. It supports efforts to interpret and model observations of planetary atmospheres. Measurement efforts on molecular nitrogen, sulfur dioxide, diatomic sulfur, and carbon dioxide are in progress.
N2: We focus on the measurement of line f-values and line widths within the complex spectrum between 80 and 100 nm. Our measurements are incorporated into a theoretical model of N2 which has established the mechanisms responsible for predissociation and reproduces all observed absorption features in 14N2 and its isotopologues as a function of temperature.
SO2: Using the Imperial College UV Fourier transform spectrometer, we have completed and published cross sections at room temperature from 198 to 325 nm, at 198 K from 213 to 325 nm, and at 160 K from 199 to 220 nm.
S2: Interpretations of atmospheric (Io, Jupiter, cometary comae) S2 absorption features are hindered by a complete lack of laboratory cross section data in the ultraviolet. We are working to quantify the photoabsorption spectrum of S2 from 200 to 300 nm based on laboratory measurements and theoretical calculations. We have designed an experimental apparatus to produce a stable column of S2 vapor. Measurements of the absorption spectrum of S2 at high resolution will be complemented by coupled-channel calculations.
CO2: The photodissociation of CO2 is a fundamental photochemical process in the atmospheres of Mars and Venus. Our research centers on the measurement of high resolution cross sections from 87 to 120 nm. We have completed measurements at 295 K and 195 K over the 106 to 120 nm region, and we have recorded preliminary data of the room temperature spectrum in the 87 to 106 nm region.

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