Studies of the kinetics of the vibrational and rotational distribution functions of nitrogen excited by a pulsed discharge

Abstract

LJ absorption edges of rare earths. R , in RCu& (except for R = La. Ce, Eu. Er and Lu) and in RCu2Ge2 (except for R = La. Ce, Er and Lu) intermetallic compounds are recorded. Shifts in energy of the L? edge in these systems with respect to corresponding rare-earth metal edge position are measured. It is found that the rare-earth ions exist in a trivalent state except for Eu and Yb. The divalent state of Eu in EuCu2GeZ and that of Yb in YbCuzGe2 are established. Shifts in energy of the K absorption edge of Cu in RCuZSi2 and RCu2Ge2 (except for Ho and Lu) are also measured. The present results on the Kedge shifts of Cu in RCu2GeZ and RCu2Si2 are. in general, consistent with the available NMR measurements on the same systems.

Coherent anti-Stokes Raman scattering and spontaneous Raman scattering diagnostics of nonequilibrium plasmas and flows

“…The first term in equation (25) contributes to Rayleigh and pure rotational Raman scattering, whereas the second term represents vibrational Raman scattering.…”

CARS (coherent anti-Stokes Raman spectroscopy) diagnostics of discharges

“…Recently, the use of CARS has shown this to be possible (ref. 8,10). The present report is based on work done in preparation for a study of nitridation (ref.…”

“…Surprisingly, very few papers have been published so far on CARS studies of such plasmas (ref. [6][7][8][9][10], although the initial demonstration of feasibility is quite old (ref. 6).…”

Mechanisms of Ionizational Nonequilibrium in Air Plasmas

“…The N2-N2 V-V exchange process has been studied experimentally at 300K by [36][37][38][39][40][41] and theoretically by semiclassical trajectory methods [42,43] and SSH theory [44,45]. These results are plotted in Figure 23.…”

“…On the other hand, measuring V-V probabilities for nitrogen is difficult because of the very weak absorption vibrational spectrum. Podobedov [36], Valyanskii et al [37,38], Suchkov and Shebeko [39] and Gordeev and Shakatov [41] monitored the relaxation of nitrogen vibrational levels using Raman methods. They obtained the rate constant fc°^_, by fitting their experimental results with solutions of the coupled kinetic equations describing the relaxation process.…”