Mach-Shock electron distributions from solids

Heavy ion induced density fluctuations in the electron plasma of solids known as wakes show the characteristic features of Mach-shock waves. We propose a method to detect the electron wake in solid state materials by measuring the angular distribution of emitted electrons of low energy. These show up as distinct maxima at certain angles. In the emission angle we find an increase with bombarding energy, following the Mach relation cos THETAsub(em) = Vsub(s)/V0. (orig.)