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Issue 6, 2007
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Efficiencies of state and velocity-changing collisions of superthermal CN A2Π with He, Ar, N2 and O2

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Abstract

Polarized laser photolysis of ICN is combined with saturated optical pumping to prepare state-selected CN A2Π (ν′ = 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 A2Π–X2Σ+ (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.

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

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Publication details

The article was received on 16 Oct 2006, accepted on 30 Nov 2006 and first published on 18 Dec 2006


Article type: Paper
DOI: 10.1039/B614965K
Citation: Phys. Chem. Chem. Phys., 2007,9, 747-754
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    Efficiencies of state and velocity-changing collisions of superthermal CN A2Π with He, Ar, N2 and O2

    A. Alagappan, I. Ballingall, M. L. Costen, K. G. McKendrick and G. Paterson, Phys. Chem. Chem. Phys., 2007, 9, 747
    DOI: 10.1039/B614965K

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