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Updated: Jun 18, 2026

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
Published on: February 10, 2020
Picosecond time-resolved pure-rotational coherent anti-Stokes Raman spectroscopy for N(2) thermometry
Thomas Seeger1, Johannes Kiefer, Alfred Leipertz
1Lehrstuhl für Technische Thermodynamik and Erlangen Graduate School in Advanced Optical Technologies(SAOT), Friedrich-Alexander-Universität Erlangen Nürnberg, Am Weichselgarten 8, D-91058, Erlangen, Germany.
Abstract:
Time-resolved pure-rotational coherent anti-Stokes Raman spectroscopy using picosecond-duration laser pulses is investigated for gas thermometry. The use of picosecond laser pulses significantly reduces background caused by scattering of the probe beam, and delayed probing of the Raman coherence enables elimination of interference from nonresonant four-wave mixing processes. Temperatures inferred from rotational spectra are sensitive to the probe delay because of the rotational-level dependence of collisional dephasing of Raman coherences. The sensitivity decreases, however, with increasing temperature, and accurate temperature measurements in a flame are demonstrated using a standard frequency-domain analysis of the spectra.
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