Monte Carlo Calculations of Electron Scattering in Photoemission

Calculations have been made of the escape probability of a photoelectron after undergoing 0, 1, 2, · · · electron-phonon scattering events. Parameters include the mean free path for scattering by phonons, $l_p$, the mean free path for scattering by electrons, $l_e$, an optical-absorption coefficient, and a surface escape cone. Results have been tabulated so as to be of use in the analysis of photoemission data. Application of the results to experimental data on aluminum indicate $l_p\approx 130$ Å and $l_e\approx 500$ Å for electrons 9 eV above the Fermi energy.