Determination of the lifetime width of the argon L1-hole state.

Abstract

The width of the argon 2s level was experimentally obtained from x-ray emission-spectroscopy (2.25\ifmmode\pm\else\textpm\fi{}0.15 eV) and x-ray photoelectron-spectroscopy (XPS) (2.25\ifmmode\pm\else\textpm\fi{}0.05 eV) measurements. A theoretical value of 1.85 eV was obtained by a Green's-function calculation. A high-energy satellite located 2.7\ifmmode\pm\else\textpm\fi{}0.2 eV above the ${\mathit{L}}_{1\mathrm{\ensuremath{-}}}$${\mathit{M}}_{2,3}$ x-ray emission transition was confirmed and identified as the 2${\mathit{s}}^{\mathrm{\ensuremath{-}}1}$3${\mathit{p}}^{\mathrm{\ensuremath{-}}1}$\ensuremath{\rightarrow}3${\mathit{p}}^{\mathrm{\ensuremath{-}}2}$ double-hole transition. The XPS measurement of the argon 2s ionization energy gave a value of 326.25(5) eV.