Elektronendichten und Elektronentemperaturen bei Verdichtungsstößen
Electromagnetically driven shock-waves of about Mach 50 in Helium have been spectroscopically analysed. Shape and relative intensities of the HeII-3203 and HeI-5876 lines and continuum have been measured during the first microsecond following the luminous front. From 0.15 μsec up to 0.85 μsec after luminous onset electron density decreases from 2.5·1017cm−3 to 1017cm−3. The electron temperature drops from 4.5 eV to 4.0 eV. Values as calculated byRankine-Hugoniot coincide with experimental results within 10%. From HeI-5876 and HeI-3889 precursor radiation and no corresponding radiation from HeII-lines it is to be concluded that the signals are due to secondary emission.