High-resolution ejected-electron spectrum of calcium vapour autoionising levels excited by low-energy electron impact

Abstract
The ejected-electron spectrum of calcium vapour between 12.8 and 28.1 eV has been observed at 75 degrees with respect to an incident electron beam of 30 to 500 eV energy. A total of 165 lines are reported, corresponding to excitation of both Ca I and Ca II levels. The results are compared with photoabsorption measurements and high-energy electron impact data.