Determination of line shift coefficients and temperature in extreme media by femtosecond time-resolved four-wave-mixing spectroscopy

Marcus Motzkus; T. Lang

doi:10.1117/12.459394

19 March 2002 Determination of line shift coefficients and temperature in extreme media by femtosecond time-resolved four-wave-mixing spectroscopy

Marcus Motzkus, T. Lang

Author Affiliations +

Proceedings Volume 4460, Selected Research Papers on Spectroscopy of Nonequilibrium Plasma at Elevated Pressures; (2002) https://doi.org/10.1117/12.459394
Event: Selected Research Papers on Spectroscopy of Nonequilibrium Plasma at Elevated Pressures, 2002, Moscow, Russian Federation

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.

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Marcus Motzkus and T. Lang "Determination of line shift coefficients and temperature in extreme media by femtosecond time-resolved four-wave-mixing spectroscopy", Proc. SPIE 4460, Selected Research Papers on Spectroscopy of Nonequilibrium Plasma at Elevated Pressures, (19 March 2002); https://doi.org/10.1117/12.459394

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