Atmospheric CO2(v3) Excitation Processes Measured by Laser Photolysis / Infrared Emission

Details Atmospheric CO2(v3) Excitation Processes Measured by Laser Photolysis / Infrared Emission Atmospheric CO2(v3) Excitation Processes Measured by Laser Photolysis / Infrared Emission

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa53a1240s&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA53A-1240

Physics

[0340] Atmospheric Composition And Structure / Middle Atmosphere: Composition And Chemistry, [0342] Atmospheric Composition And Structure / Middle Atmosphere: Energy Deposition, [3359] Atmospheric Processes / Radiative Processes

Scientific paper

A series of kinetics experiments measured the time-dependent CO2 IR fluorescence at 4.3 um, after 248 nm ozone photolysis. CO2 emissions reduce the heating of the upper atmosphere. By adding various gases, different excitation processes can be investigated quantitatively. Yields for O(D) + N2 and CO2 -> N2(v) and CO2(v3) were determined; these vibrations are near resonant and equilibrate rapidly. Efficient new processes involving O2(a,v) and O2(b) with CO2 were observed. By adding H2 and forming OH(v=6-9) from the H + O3 reaction, an efficient CO2(v3) excitation pathway from OH(v) was measured. At least one quantum of CO2(v3) excitation results per OH formed. High yields have implications for the analogous proposed OH(v) + N2 -> N2(v) process. Observations of OH and CO2 overtone emissions, and CO vibrational radiation when it was added, were also recorded. Research supported by the NASA Geospace Science Program. K. H. was an NSF Physics Research Experiences for Undergraduates student.

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