A method, is proposed for isolating the excess emission of a thermal nitrogen plasma behind a reflected shock wave. The initial pressure of the test gas was 400 Pa in all experiments. The velocity of the incident shock wave was varied from 7.5 to 8.3 km/sec. The probing light source was a discharge in a capillary tube. A reversal effect was observed at a distance of 1.5 mm from the end of the shock tube, simultaneously at several wavelengths in the 0.42-0.52 micron band. The results indicate that an excess component of nonthermal nature is present under certain conditions in the nitrogen - plasma continuum. The values found for the emission - coefficient ratios - excess over thermal to thermal - are of the order of 0.2-0.5 in the temperature range studied.
Science News of the Faculty of Physics, Lomonosov Moscow State University
This new information publication, which is intended to convey to the staff, students and graduate students, faculty colleagues and partners of the main achievements of scientists and scientific information on the events in the life of university physicists.