1-D imaging of rotation-vibration non-equilibrium from pure rotational ultrafast coherent anti-Stokes Raman scattering

Timothy Y. Chen, Benjamin M. Goldberg, Brian D. Patterson, Egemen Kolemen, Yiguang Ju, Christopher J. Kliewer

Research output: Contribution to journalArticlepeer-review

Abstract

We present one-dimensional (1-D) imaging of rotation-vibration non-equilibrium measured by two-beam pure rotational hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering (fs/ps CARS). Simultaneous measurements of the spatial distribution of molecular rotation-vibration non-equilibrium are critical for understanding molecular energy transfer in low temperature plasmas and hypersonic flows. However, non-equilibrium CARS thermometry until now was limited to point measurements. The red shift of rotational energy levels by vibrational excitation was used to determine the rotational and vibrational temperatures from 1-D images of the pure rotational spectrum. Vibrational temperatures up to 5500 K were detected in a CH4/N2 nanosecond-pulsed pin-to-pin plasma within 2 mm near the cathode. This approach enables study of non-equilibrium systems with 40 µm spatial resolution.

Original languageEnglish (US)
Pages (from-to)4252-4255
Number of pages4
JournalOptics Letters
Volume45
Issue number15
DOIs
StatePublished - Aug 1 2020

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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