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

Journal Article · · Optics Letters
DOI:https://doi.org/10.1364/ol.394122· OSTI ID:1906181
 [1];  [2];  [2];  [3];  [4];  [2]
  1. Princeton Univ., NJ (United States); Princeton University
  2. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  3. Princeton Univ., NJ (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  4. Princeton Univ., NJ (United States)
+ Show Author Affiliations

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. As a result, this approach enables study of non-equilibrium systems with 40 µm spatial resolution.

Research Organization:
Princeton Univ., NJ (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0020233; NA0003525; SC0014664; FE0026825
OSTI ID:
1906181
Alternate ID(s):
OSTI ID: 1887474
Journal Information:
Optics Letters, Journal Name: Optics Letters Journal Issue: 15 Vol. 45; ISSN 0146-9592
Publisher:
Optical Society of America (OSA)Copyright Statement
Country of Publication:
United States
Language:
English

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