Absolute differential cross sections for elastic electron scattering from mercury

Publisher Website
Google Scholar
Abstract
Absolute differential cross sections sigma ( theta ) for elastic electron scattering from mercury atoms were measured in the energy range from 25 to 300 eV at scattering angles up to 135'. The smallest scattering angles were 2 and 7' at 300 and 25 eV, respectively. A target cell was used in which the pressure could be controlled precisely. The scattered beam passed through a well defined system of two apertures and a spectrometer, which removed inelastically scattered electrons without diminishing the elastic current. At each scattering angle the primary and scattered beam currents and the temperature of the target were measured at various pressures. A suitable extrapolation of these data to zero target density yields at each scattering angle an absolute value of sigma ( theta ) which is not affected by multiple scattering or disturbing ions. In the range of overlap with Bromberg's absolute values at 300 eV, his values are about 10% small than ours. The internal consistency of existing total cross section measurements is checked and by combining the present data with others the scattering amplitudes mod f mod and mod g mod of Mott's theory are extracted.

This publication has 36 references indexed in Scilit: