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Spektroskopische Untersuchung unelastischer Stöße zwischen Ionen oder metastabilen Atomen der Edelgase und Alkalimetallatomen bei thermischen Stoßenergien
Author(s) -
Vogel D.,
Tolmachev Yu. A.
Publication year - 1982
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.19820220502
Subject(s) - penning ionization , chemistry , excited state , atomic physics , ionization , afterglow , ion , alkali metal , reaction rate constant , metastability , analytical chemistry (journal) , kinetics , physics , chromatography , organic chemistry , gamma ray burst , quantum mechanics , astronomy
The present work deals with the spectroscopic investigation of Penning ionization and nonresonant charge exchange due to thermal‐energy collisions of metastable atoms or ions of the inert gases He, Ne with atoms of alkali metals K, Rb, Cs in a low temperature plasma of the corresponding binary mixtures. The rate constants of these reactions and partial rate constants of exciting several alkali metal ion levels were determined by the kinetics of the decay of ionized and excited particles in the afterglow of a pulsed discharge. Measured Penning and charge exchange constants are in order of 10 10‐9 cm 3 sec −1 . Partial Penning constants in the HeCs system exhibit a small dependence of the energy defect of reaction, whereby an important part of collisions results in excited Cs + ‐states. On the contrary, energy transfer by charge exchange in HeRb, Cs systems distinguishes by a significant energy defect dependence. Charge exchange from He + to Rb 0 leads above all to He(2 3 S 1 )‐atoms and normal Rb + ‐ions. It follows from the metal ion spectrums, that Penning ionization and charge exchange of the investigated systems under utilized conditions represent as processes of selective excitation of alkali metal ions in afterglow and stationary discharge.