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Resonance Charge Transfer Effects in Carbon Plasmas and Measured Population Inversion*

Published online by Cambridge University Press:  25 September 2017

R.H. Dixon  and
R.C. Elton
R.H. Dixon
Affiliation:
U.S. Naval Research Laboratory, Washington, D.C., USA
R.C. Elton
Affiliation:
U.S. Naval Research Laboratory, Washington, D.C., USA

Extract

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Resonance line CV and CVI plasma spectra in the 40 Å region indicate a reduced (Nn /wn) population density inversion of ∽4X between n=4 and n=3 excited levels. Inversion between n=5 and n=3 is also observed. The ions are created from a graphite target by a 5 J, 16 ns Nd glass laser pulse focused to a 0.5 mm spot, i.e., 2 x 1011 W/cm2 . These ions expand into a gaseous atmosphere (H, He, Ne, Ar, …) . The greatest degree of inversion is observed at ∽15 mm from the target surface at a pressure of 1-2 Torr in helium or hydrogen. At this distance both ions and neutrals are detected by space - and time-resolved spectroscopy, and an electron density of 5 x 1016 cm– is measured from Stark broadening.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 43: Vth Conference on UV & X-Ray Spectroscopy of Astrophysical & Laboratory Plasmas , July 1977 , pp. 2
Copyright
Copyright © Crown Research Institutes 1977

Footnotes

*

Supported in part by the U.S. Energy Research and Development Administration under Contract No. E (49-20)-1010

References

* Supported in part by the U.S. Energy Research and Development Administration under Contract No. E (49-20)-1010