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Rapid passage induced population transfer and coherences in the 8 micron spectrum of nitrous oxide

Duxbury, G. and Langford, N. and McCulloch, M. T. and Wright, S. (2007) Rapid passage induced population transfer and coherences in the 8 micron spectrum of nitrous oxide. Molecular Physics, 105 (5-7). pp. 741-754. ISSN 0026-8976

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Abstract

Rapid passage signals showing the effects of molecular alignment have been observed when low pressure samples of nitrous oxide are interrogated by radiation from a pulsed 7.84 mu m quantum cascade laser. These effects occur when the sweep rate of the laser through a Doppler broadened absorption line is much faster than the collisional relaxation time, and when the power density of the linearly polarized laser radiation is sufficient to cause optical pumping. Using a laser pulse of duration 1.3 mu s, the frequency sweeps approximately 90 GHz. The variation of the laser tuning rate during the laser pulse, from about 100 MHz/ns at the beginning to about 20 MHz/ns at the end, allows the relationship between sweep rate and collisional damping to be investigated. It is shown, by comparing the experimental signals with those calculated by coupled Maxwell-Bloch equations, how the rapid passage effects in nitrous oxide are influenced by the number density, transition cross-section and reorientation lifetime.

Item type: Article
ID code: 31026
Keywords: vapor, lasers, light, Optics. Light, Molecular Biology, Physical and Theoretical Chemistry, Biophysics, Condensed Matter Physics
Subjects: Science > Physics > Optics. Light
Department: Faculty of Science > Physics
Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 20 Jun 2011 16:48
    Last modified: 05 Sep 2014 08:49
    URI: http://strathprints.strath.ac.uk/id/eprint/31026

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