Energy and angular distributions of backscattered electrons from the collision of8−keVelectrons with a thick tungsten target

Abstract

The energy and angular distributions of backscattered electrons produced under impact of $8.0\text{\ensuremath{-}}\mathrm{keV}$ electrons with a thick tungsten target are measured. The energy range of backscattered electrons is considered between 70 and $1700\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$. The angle of incidence $\ensuremath{\alpha}$ and the takeoff angle $\ensuremath{\theta}$ are chosen to have values $\ensuremath{\alpha}=0\ifmmode^\circ\else\textdegree\fi{}$, 10\ifmmode^\circ\else\textdegree\fi{}, and 20\ifmmode^\circ\else\textdegree\fi{} and $\ensuremath{\theta}=110\ifmmode^\circ\else\textdegree\fi{}$, 120\ifmmode^\circ\else\textdegree\fi{}, and 130\ifmmode^\circ\else\textdegree\fi{}, respectively. The energy distribution function exhibits two sharp peaks, which are found to appear at 216 and $548\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$. They are identified as Auger peaks of tungsten arising due to electron transitions $4d\text{\ensuremath{-}}6s6p$ and $4s\text{\ensuremath{-}}6s6p$, respectively. The measured energy spectra are compared with two different theoretical models. The theoretical predictions are found to yield a good agreement with the experiment in the considered energy range of the backscattered electrons.