Laboratory Measurements and Modeling of Molecular Photoabsorption Cross Sections for Planetary Applications

Details Laboratory Measurements and Modeling of Molecular Photoabsorption Cross Sections for Planetary Applications Laboratory Measurements and Modeling of Molecular Photoabsorption Cross Sections for Planetary Applications

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p31b1526s&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #P31B-1526

Astronomy and Astrophysics

Astronomy

[0343] Atmospheric Composition And Structure / Planetary Atmospheres, [6299] Planetary Sciences: Solar System Objects / General Or Miscellaneous

Scientific paper

Our research program comprises the measurement and modeling of ultraviolet molecular photoabsorption cross sections with the highest practical resolution. It supports efforts to interpret and model observations of planetary atmospheres. Measurement and modeling efforts on molecular nitrogen, sulfur dioxide, diatomic sulfur, and carbon dioxide are in progress. Molecular Nitrogen: 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 the absorption spectrum of N2 which has established the mechanisms responsible for predissociation and reproduces all observed features in 14N2 and its isotopomers as a function of temperature. Sulfur Dioxide: 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 room temperature cross sections from 198 to 325 nm and 160 K cross sections from 199 to 220 nm. We have completed work on further low-temperature measurements from 220 to 325 nm. Diatomic Sulfur: 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. Carbon Dioxide: 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 taken preliminary data of the room temperature spectrum in the 87 to 106 nm region.

Affiliated with

Also associated with

No associations

Rating

Laboratory Measurements and Modeling of Molecular Photoabsorption Cross Sections for Planetary Applications does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Laboratory Measurements and Modeling of Molecular Photoabsorption Cross Sections for Planetary Applications, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Laboratory Measurements and Modeling of Molecular Photoabsorption Cross Sections for Planetary Applications will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1496264