Efficiencies of state and velocity-changing collisions of superthermal CN A2Π with He, Ar, N2 and O2

Azhagammai Alagappan, Iain Ballingall, Matthew L. Costen, Kenneth G. McKendrick, Grant Paterson

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Polarized laser photolysis of ICN is combined with saturated optical pumping to prepare state-selected CN A2? (?' = 4, J = 0.5, F2, f) with a well-defined anisotropic superthermal speed distribution. The collisional evolution of the prepared state is observed by Doppler-resolved Frequency Modulated (FM) spectroscopy via stimulated emission on the CN A2?-X2S+ (4,2) band. The phenomenological rate constants for removal of the prepared state in collisions with He, Ar, N2 and O2 are reported. The observed collision cross-sections are consistent with attractive forces contributing significantly for all the colliders with the exception of He. The collisional evolution of the prepared velocity distribution demonstrates that no significant back-transfer into the prepared level occurs, and that any elastic scattering is strongly in the forward hemisphere. © the Owner Societies 2007.

Original languageEnglish
Pages (from-to)747-754
Number of pages8
JournalPhysical Chemistry Chemical Physics
Volume9
Issue number6
DOIs
Publication statusPublished - 2007

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