Laboratory Measurements And Modeling Of Molecular Photoabsorption Cross Sections In The Ultraviolet: N2, So2, S2, Co2

Details Laboratory Measurements And Modeling Of Molecular Photoabsorption Cross Sections In The Ultraviolet: N2, So2, S2, Co2 Laboratory Measurements And Modeling Of Molecular Photoabsorption Cross Sections In The Ultraviolet: N2, So2, S2, Co2

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.4809s&link_type=abstract

American Astronomical Society, DPS meeting #42, #48.09; Bulletin of the American Astronomical Society, Vol. 42, p.971

Astronomy and Astrophysics

Astronomy

Scientific paper

Our research program comprises the measurement and modeling of ultraviolet molecular photoabsorption cross sections with the highest practical resolution. Measurement and modeling efforts on molecular nitrogen, sulfur dioxide, diatomic sulfur, and carbon dioxide are in progress.
N2: We measure line f-values and widths within the complex spectrum between 80 and 100 nm. Our measurements are incorporated into a theoretical model of the absorption spectrum of N2 which has established the mechanisms responsible for predissociation and reproduces the observed features in all N2 isotopomers as a function of temperature.
SO2: We provide astronomers with high-resolution cross section data for the complex ultraviolet SO2 absorption spectrum. Using the Imperial College VUV Fourier transform spectrometer, we have completed and published cross sections from 198 to 325 nm (295 K) and from 199 to 220 nm (160 K). We have completed work on further low-temperature measurements from 220 to 325 nm.
S2: Interpretations of atmospheric (Io, Jupiter) S2 absorption features are hindered by a complete lack of laboratory cross sections in the ultraviolet. We have begun to quantify the photoabsorption spectrum of S2 from 200 to 300 nm. We have designed an experimental apparatus to produce a stable column of S2 vapor. Measurements of S2 absorption features at high resolution will be complemented by coupled-channel calculations of the relevant transitions.
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. We have recently completed preliminary room temperature measurements in the 87 to 106 nm region.
We acknowledge grant support from NASA (NNX08AE78G), STFC-PPARC, and ARC (DP0558962).

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