Cross Sections and Yields of O(1S) and O(1D) in Photodissociation of H2O and CO2

Details Cross Sections and Yields of O(1S) and O(1D) in Photodissociation of H2O and CO2 Cross Sections and Yields of O(1S) and O(1D) in Photodissociation of H2O and CO2

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.6220h&link_type=abstract

American Astronomical Society, DPS meeting #38, #62.20; Bulletin of the American Astronomical Society, Vol. 38, p.609

Astronomy and Astrophysics

Astronomy

3

Scientific paper

A number of observers have used the relative strengths of the oxygen O(1S→1D) green and O(1D→3P) red lines to make inferences about cometary composition. The key questions are the yields of O(1S) and O(1D) in photodissociation of H2O and CO2 by solar radiation. We find that the secondary references used by the cometary community are not mutually consistent and not sufficiently detailed about how the yields were derived from convolution of the solar spectrum with photodissociation yield spectra. After a careful review of the laboratory literature we have concluded that:
1. Production of O(1S) by photodissociation of H2O has never been reported in the laboratory literature. In fact, no experiment has been attempted that could have detected production of O(1S). Thus there is no experimental basis for an estimate of its yield.
2. The situation is almost reversed for photodissociation of CO2. The yield of O(1S) has been measured in a number of studies to approach unity in a narrow wavelength window around 112.5 nm. The yield of O(1D) has never been measured (very difficult because of rapid quenching). However, all photochemists believe that it is the primary product over much of the absorption spectrum.
3. Additional experimental yield determinations with high spectral resolution are needed. Funding has just been obtained from the NASA Outer Planets Program.

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