SECONDARY PHOTOELECTRON-SPECTRA OF NACL AND KBR EXCITED BY XUV RADIATION - EXPERIMENTS AND COMPUTER-SIMULATIONS

Energy distributions of slow electrons (0 to 10 eV) emitted by thin layers of NaCl and KBr irradiated by monochromatic XUV photons with various energies in the interval of 50 to 300 eV are measured. For all cases the photoelectron spectrum starts with an intense peak of slow secondaries and has a hot-secondary structure at the energies 1 to 5 eV. The smaller the photon absorption depth, the stronger is this structure. An attempt is made to reproduce such a behaviour of spectra by a Monte Carlo simulation of electron-electron and electron-phonon scattering sequences induced in solids by XUV photon absorption. It appears that for high-energy (> 2 to 3 eV) conduction electrons the electron-phonon scattering is mainly due to acoustic phonons.