Issue 7, 2005

Hyperfine quantum beats from photolytic orientation and alignment

Abstract

Using Doppler-resolved transient frequency modulation absorption spectroscopy, we have measured both alignment and orientation quantum beats arising from nuclear hyperfine depolarization of low rotational levels of CN X 2Σ+ photofragments produced in the ultraviolet photodissociation of ICN. Under our conditions of fully resolved fine-structure and completely unresolved hyperfine structure, the observed time evolution is insensitive to the rapid depolarization of angular momentum N that would be observed if the fine-structure components were not resolved. Non-statistical spin-rotation populations of CN photofragments, previously observed only for high rotational states, are now observed even for the lowest rotational states, indicating that the electron can not be considered a spectator spin in the depolarization.

Graphical abstract: Hyperfine quantum beats from photolytic orientation and alignment

Article information

Article type
Paper
Submitted
12 Dec 2004
Accepted
15 Feb 2005
First published
02 Mar 2005

Phys. Chem. Chem. Phys., 2005,7, 1408-1413

Hyperfine quantum beats from photolytic orientation and alignment

M. L. Costen and G. E. Hall, Phys. Chem. Chem. Phys., 2005, 7, 1408 DOI: 10.1039/B419006H

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