O(1D) Relaxation by O(3P)

Details O(1D) Relaxation by O(3P) O(1D) Relaxation by O(3P)

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa11a0215c&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SA11A-0215

Physics

0310 Airglow And Aurora, 0317 Chemical Kinetic And Photochemical Properties, 0358 Thermosphere: Energy Deposition (3369), 0394 Instruments And Techniques, 0399 General Or Miscellaneous

Scientific paper

We report laboratory experiments investigating the relaxation of O(1D) by O(3P) atoms. Rate coefficients for this process deduced from atmospheric observations and theoretical calculations have appeared in the literature that differ by more than an order of magnitude. No laboratory measurement of the rate coefficient is available, despite its importance in determining the energy flow in the upper atmosphere and controlling the intensity of atomic oxygen emissions. In the experiments, molecular oxygen is photodissociated to O(1D) and O(3P) atoms by the 157-nm output of a fluorine laser. The temporal evolution of the O(1D) concentration is monitored by detection of the 630-nm emission. Our laboratory results indicate that O(1D) relaxation by O(3P) atoms is very efficient, with a rate coefficient of approximately 2 × 10-11 cm3s-1 at room temperature. The relevance to atmospheric observations and ionospheric heating experiments will be discussed. The participation of Kristina D. Closser was made possible by the NSF Research Experiences for Undergraduates Program under grant PHY-0353745. This research is supported by NSF grants ATM-0209229 and ATM-0216583.

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