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Proceedings Paper

Determination of line shift coefficients and temperature in extreme media by femtosecond time-resolved four-wave-mixing spectroscopy
Author(s): Marcus Motzkus; T. Lang
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Paper Abstract

Time resolved nonresonant CARS (Coherent Anti-Stokes Raman Spectroscopy) is applied to probe combustion relevant species with fs time resolution under extreme conditions. The experimental transients on the prototype molecule H2 show detailed beating structures, reflecting the rotational dynamics of all thermally populated ground state J-levels with high fidelity. Modelling of the experimental data yields temperatures and pressures with high accuracy and resolution. The good agreement with values determined by frequency-domain experiments demonstrates the suitability of this method for the determination of J-dependent line-shifting coefficients in gaseous mixtures at high pressures and temperatures, where frequency-domain CARS spectra are difficult to model.

Paper Details

Date Published: 19 March 2002
PDF: 9 pages
Proc. SPIE 4460, Selected Research Papers on Spectroscopy of Nonequilibrium Plasma at Elevated Pressures, (19 March 2002); doi: 10.1117/12.459394
Show Author Affiliations
Marcus Motzkus, Max-Planck-Institut fuer Quantenoptik (Germany)
T. Lang, Max-Planck-Institut fuer Quantenoptik (Germany)


Published in SPIE Proceedings Vol. 4460:
Selected Research Papers on Spectroscopy of Nonequilibrium Plasma at Elevated Pressures
Vladimir N. Ochkin, Editor(s)

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