A study of the VUV emission from highly ionized krypton in a theta pinch plasma

https://doi.org/10.1016/0022-4073(83)90029-8Get rights and content

Abstract

The ionization rates of Kr(IX), (X), (XI), and (XII) have been measured using a fast 60-kV-60kJ theta pinch as a plasma source. The line emission from each ion stage has been identified and the time evolution observed. A coupled set of rate equations was used along with time- and space-resolved measurements of the electron density and temperature to model the plasma light emission. The ionization rates of Kunze were adjusted by multiplying the rate for each ion stage with a constant until the peak intensity of the calculated emission agreed with the time of the observed peak intensity. The constants required for best fit were 2.5, 0.15, 3.0, and 2.0 for Kr(IX), (X), (XI), and (XII), respectively. Two successive ionization stages, Kr(X) and Kr(XI), have shown the same time dependence and possible reasons for this observation are discussed. During the course of modeling the light emission, we have also found that the rate for the excitation from the 3dn to the 3p53dn+1 level in Kr(X) (n=9) and Kr(XI) (n=8) is a factor of 5 lower than predicted by the van Regemorter excitation rate equation.

References (24)

  • A.W. DeSilva et al.
  • H.J. Kunze

    Space Sci. Rev.

    (1972)
  • E. Hinnov

    Phys. Rev. A

    (1976)
  • D.E. Post et al.

    At. Data Nucl. Data Tables

    (1971)
  • L.A. Jones et al.

    J. Phys. B

    (1976)
  • F.C. Jahoda et al.

    Los Alamos Scientific Laboratory Report

    (1972)
    D.B. Thomson et al.

    Pulsed High Beta Plasmas

  • R.U. Datla et al.

    Phys. Rev. A

    (1972)
  • R.D. Cowan

    J. Opt. Soc. Am.

    (1968)
    R.D. Cowan

    J. Opt. Soc. Am.

    (1968)
  • R.D. Cowan

    The Theory of Atomic Structure and Spectra

    (1981)
    R.D. Cowan

    Los Alamos Scientific Laboratory Report

    (1977)
  • R.L. Kelly et al.

    Naval Research Laboratory Report NRL-7599

    (1973)
    R.L. Kelly

    ORNL-5922

    (1982)
  • B.C. Fawcett et al.

    Proc. Phys. Soc.

    (1964)
  • H. van Regemorter

    Astroph. J.

    (1962)
  • Cited by (9)

    • Electron-ion collisional rate coefficients from time-dependent plasmas

      1988, Journal of Quantitative Spectroscopy and Radiative Transfer
    • Modeling of the LIFE minichamber Xe theta pinch experiment

      2011, Proceedings of SPIE - The International Society for Optical Engineering
    • Evidence for coherent electron motions in multiphoton x-ray production from kr and xe clusters

      1994, Journal of Physics B: Atomic, Molecular and Optical Physics
    • Multiphoton-induced X-ray emission and amplification from clusters

      1993, Applied Physics B Photophysics and Laser Chemistry
    View all citing articles on Scopus
    View full text