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

TY Chen, BM Goldberg, BD Patterson, E Kolemen… - Optics Letters, 2020 - opg.optica.org
Optics Letters, 2020opg.optica.org
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 …
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 CH_4/N_2 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.
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