Measurement of electron-impact excitation cross sections out of metastable levels of argon and comparison with ground-state excitation
- 1 April 1999
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 59 (4), 2749-2763
- https://doi.org/10.1103/physreva.59.2749
Abstract
This paper reports the results of measurements of cross sections for electron excitation out of the and metastable levels of argon (the and 2 levels, respectively, of the configuration) into eight of the ten levels of the manifold. The metastable atoms were generated by two methods: (a) an atomic beam emerging from a hollow-cathode discharge, and (b) charge-exchange collisions between a fast argon-ion beam and cesium atoms. The metastable argon atoms are excited by a crossed electron beam into the levels and the emissions from these levels are utilized to determine the cross sections. Removal of the atoms in the hollow-cathode discharge experiment by means of laser pumping allows us to determine the separate contributions from each metastable level to the observed fluorescence signal. The magnitudes of the cross sections for excitation out of the metastable levels into the different levels of the manifold vary vastly. The patterns of the observed variations are interpreted by means of a multipole analysis. This multipole model is also used to discuss the comparison of excitation cross sections out of the metastable levels with those out of the ground level.
Keywords
This publication has 33 references indexed in Scilit:
- Measurement of electron-impact excitation into thelevels of argon using Fourier-transform spectroscopyPhysical Review A, 1998
- Cross sections for electron excitation of the2t3S metastable level of He into higher triplet levelsPhysical Review A, 1997
- Convergent close-coupling calculations of electron - helium scatteringJournal of Physics B: Atomic, Molecular and Optical Physics, 1997
- Apparatus for measuring electron-impact excitation cross sections using fast metastable atoms produced via charge exchangeReview of Scientific Instruments, 1996
- Cross sections of electron excitation out of metastable helium levels with a fast metastable target produced via charge exchangePhysical Review A, 1996
- The influence of metastables on the plasma-induced emission in a helium rf dischargePlasma Physics and Controlled Fusion, 1996
- Electron excitation from the 11S, 23S and 21S states of helium. An eleven-state R-matrix calculationJournal of Physics B: Atomic and Molecular Physics, 1985
- Composition of partially metastable rare gas beamsThe Journal of Chemical Physics, 1976
- Experimental and Theoretical Studies of Electron-Impact Excitation of NeonPhysical Review A, 1970
- The Lifetime of the 2^{2}S_{1/2} State of Hydrogen in an Iionized Atmosphere.The Astrophysical Journal, 1952