Diagnostics of plasmas by CARS (coherent anti-Stokes Raman scattering)
Abstract
Some of the most representative results of the coherent anti-Stokes Raman spectroscopy research program on discharges at ONERA are presented. A very short review or the principles or CARS and of the main instrumental characteristics is first given. The results of an analysis or a magnetic multipole-confined H2 discharge are then shown. The kinetics of rotational and vibrational state populations have been followed in the transient regime and the deactivation of the vibrational level v = 1 by the walls measured. Also, O2 in a glow discharge and in a waveguide discharge has been studied. Rotational, vibrational temperatures and the density of the 1Delta state have been monitored as functions of position, pressure, and discharge current.
- Publication:
-
ONERA TP
- Pub Date:
- 1993
- Bibcode:
- 1993ONERA....V....L
- Keywords:
-
- Molecular Excitation;
- Molecular Oscillations;
- Molecular Rotation;
- Plasma Diagnostics;
- Raman Spectroscopy;
- Rotational Spectra;
- Temperature Measurement;
- Vibrational Spectra;
- Instrumentation and Photography