| Autor: |
Chen TY, Goldberg BM, Patterson BD, Kolemen E, Ju Y, Kliewer CJ |
| Jazyk: |
angličtina |
| Zdroj: |
Optics letters [Opt Lett] 2020 Aug 01; Vol. 45 (15), pp. 4252-4255. |
| DOI: |
10.1364/OL.394122 |
| Abstrakt: |
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 C H 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. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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