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Issue 7, 2005
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Hyperfine quantum beats from photolytic orientation and alignment

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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

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Article information


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

Phys. Chem. Chem. Phys., 2005,7, 1408-1413
Article type
Paper

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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