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Title: Hybrid femtosecond/picosecond pure-rotational coherent anti-Stokes Raman scattering with chirped probe pulses: Hybrid femtosecond/picosecond pure-rotational coherent anti-Stokes Raman scattering with chirped probe pulses
Award ID(s):
1361516
NSF-PAR ID:
10057294
Author(s) / Creator(s):
; ; ; ; ;
Date Published:
Journal Name:
Journal of Raman Spectroscopy
Volume:
48
Issue:
12
ISSN:
0377-0486
Page Range / eLocation ID:
1881 to 1886
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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  2. 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 aCH4/N2nanosecond-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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