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Radiative Transitions and Temperature Time Dependences in Pulse Excited Microwave Discharges – (N 2 , Ar + N 2 )
Author(s) -
Janča J.,
Tálský A.
Publication year - 1976
Publication title -
beiträge aus der plasmaphysik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0005-8025
DOI - 10.1002/ctpp.19760160406
Subject(s) - excited state , atomic physics , vibrational temperature , microwave , argon , metastability , chemistry , ground state , radiative transfer , population , physics , optics , demography , organic chemistry , quantum mechanics , sociology
Quantitative spectral and microwave measurements of vibrational temperatures and electron densities were performed for 2400 MHz non‐isothermic pulse excited discharges in flowing nitrogen and argon at pressures (60–2700) Pa. A detailed analysis of the N 2 vibrational states population for the N 2 C 3 Π u , X 1 Σ g + electronic states has been carried out. The basic difficulties encountered when comparing the spectroscopically determined values of vibrational temperatures with corresponding quantities of the ground electronics state are mentioned and the time resolved dependences of the translational gas temperature in N 2 during the microwave pulse is evaluated. The steady state in the nitrogen pulse excited microwave plasma is reached within 3 · 10 −4 s, but generally, this time depends on the gas pressure in the discharge tube. In the Ar + N 2 mixtures the excitation conditions are complicated by the metastable argon atoms (3P 2,0 ) creating the nonequilibrium populations of electronic, vibrational and rotational N 2 states.