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Measurement of the Vacuum Ultraviolet Radiation from a Shock Heated
Krypton Plasma
H. H. Carls and W. W. Zuzak
Institut für Experimentalphysik der Universität Kiel, Kiel, Germany
(Received 12 March 1970)
J. Quant. Spectrosc. Radiat. Transfer, Vol. 11, pp. 1135-1141. Pergamon
Press 1971, Printed in Great Britain
ABSTRACT
The vacuum ultraviolet radiation emitted behind Mach 12 shocks in
krypton has been measured in the wavelength region between105.0 nm and
140.0 nm. The resonance lines at 116.5 nm and 123.6 nm have been found
to dominate the spectrum. The krypton resonance lines are self-reversed
indicating the presence of a cold boundary layer. The halfwidths of the
lines are about 1.0-2.0 nm, with far extending wings. During the
relaxation period neither resonance-line radiation nor continuous
molecular radiation could be detected. After 10-20 μsec resonance
radiation is observed. The temporal variation of the intensity is
identical with that of the recombination continuum in the visible and
the near ultraviolet. During the relaxation period only weak impurity
lines (N, O, C) could be detected.