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Prospect of temperature determination using degenerate four‐wave mixing with sub‐20 fs pulses
Author(s) -
Hornung Thomas,
Skenderović Hrvoje,
Kompa KarlLudwig,
Motzkus Marcus
Publication year - 2004
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1234
Subject(s) - femtosecond , excited state , four wave mixing , fourier transform , raman spectroscopy , chemistry , rotational temperature , pulse (music) , atomic physics , degenerate energy levels , laser , ultrashort pulse , raman scattering , population , mixing (physics) , optics , molecular physics , molecule , nonlinear optics , physics , demography , organic chemistry , quantum mechanics , detector , sociology
Femtosecond time‐resolved degenerate four‐wave mixing (DFWM) spectroscopy with ultrashort laser pulses was applied to probe pure rotational Raman transitions of the H 2 molecule. Owing to the broad bandwidth of the sub‐20 fs pulse, several pure rotational Stokes and anti‐Stokes transitions are simultaneously excited with the same pulse, making the experiment relevant for thermometry in combustion processes. Simulations of the DFWM signal accurately predict how the change in population distribution due to changes in temperature influences the shape of the transients and the corresponding Fourier transform. The influence of the pulse duration was also investigated. The relative peak intensities in fast Fourier transform spectra were employed for temperature determination. First measurements at room temperature show good agreement with theory. Copyright © 2004 John Wiley & Sons, Ltd.