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Title: Mass spectrometric evidence for suprathermal ionization in an inductively coupled argon plasma

Abstract

Mass spectra have been obtained of species in the axial channel of an inductively coupled argon plasma by extracting ions from the inductively coupled plasma into a vacuum system housing a quadrupole mass spectrometer. Ionization temperatures (T/sub ion/) are obtained from relative count rates of m/z-resolved ions according to two general types of ionization equilibrium considerations: (a) the radio of doubly/singly charged ions of the same element, and (b) the ratio of singly charged ions from two elements of different ionization energy. The T/sub ion/ values derived from measurement of Ar/sup +2//Ar/sup +/, Ba/sup +2//Ba/sup +/, Sr/sup +2//Sr/sup +/, and Cd/sup +//I/sup +/ are all greater than those expected from excitation temperatures measured by other workers. The latter three values for T/sub ion/ are in reasonable agreement with values obtained by optical spectrometry for a variety of argon inductively coupled plasmas.

Authors:
; ;
Publication Date:
Research Org.:
Ames Laboratory-USDOE and Department of Chemistry, Iowa State University, Ames, Iowa 50011
OSTI Identifier:
6208898
DOE Contract Number:  
W-7405-ENG-82
Resource Type:
Journal Article
Journal Name:
Appl. Spectrosc.; (United States)
Additional Journal Information:
Journal Volume: 35:4
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; PLASMA; MASS SPECTROSCOPY; ARGON IONS; BARIUM IONS; CADMIUM IONS; EXPERIMENTAL DATA; IODINE IONS; IONIZATION; PLASMA DIAGNOSTICS; STRONTIUM IONS; TEMPERATURE MEASUREMENT; CHARGED PARTICLES; DATA; INFORMATION; IONS; NUMERICAL DATA; SPECTROSCOPY; 700102* - Fusion Energy- Plasma Research- Diagnostics

Citation Formats

Houk, R.S., Svec, H.J., and Fassel, V.A. Mass spectrometric evidence for suprathermal ionization in an inductively coupled argon plasma. United States: N. p., 1981. Web. doi:10.1366/0003702814732391.
Houk, R.S., Svec, H.J., & Fassel, V.A. Mass spectrometric evidence for suprathermal ionization in an inductively coupled argon plasma. United States. doi:10.1366/0003702814732391.
Houk, R.S., Svec, H.J., and Fassel, V.A. Wed . "Mass spectrometric evidence for suprathermal ionization in an inductively coupled argon plasma". United States. doi:10.1366/0003702814732391.
@article{osti_6208898,
title = {Mass spectrometric evidence for suprathermal ionization in an inductively coupled argon plasma},
author = {Houk, R.S. and Svec, H.J. and Fassel, V.A.},
abstractNote = {Mass spectra have been obtained of species in the axial channel of an inductively coupled argon plasma by extracting ions from the inductively coupled plasma into a vacuum system housing a quadrupole mass spectrometer. Ionization temperatures (T/sub ion/) are obtained from relative count rates of m/z-resolved ions according to two general types of ionization equilibrium considerations: (a) the radio of doubly/singly charged ions of the same element, and (b) the ratio of singly charged ions from two elements of different ionization energy. The T/sub ion/ values derived from measurement of Ar/sup +2//Ar/sup +/, Ba/sup +2//Ba/sup +/, Sr/sup +2//Sr/sup +/, and Cd/sup +//I/sup +/ are all greater than those expected from excitation temperatures measured by other workers. The latter three values for T/sub ion/ are in reasonable agreement with values obtained by optical spectrometry for a variety of argon inductively coupled plasmas.},
doi = {10.1366/0003702814732391},
journal = {Appl. Spectrosc.; (United States)},
number = ,
volume = 35:4,
place = {United States},
year = {1981},
month = {7}
}