Feature of secondary ion emission at various temperature of irradiated copper single crystal

The difference between the forms and positions of the maximum of the energy spectrum of secondary 63 Cu + ions emitted from the (100) face of a Cu single crystal in close-packed directions and between them at different target temperatures is revealed. For a sample at room temperature, it is established that the most probable ion energy E max and the width h of the energy spectra at half-height increase with the polar emission angle, θ, measured from the normal to the surface. The opposite tendency, namely, a decrease in E max with increasing θ, is obtained for ions emitted from a single crystal heated to several hundred degrees Celsius. Based on modern models of secondary ion emission, the observed regularities, which must be taken into account in the theoretical description of the process and in the practical application of secondary ions in mass spectroscopy, are discussed.