Space-Distribution of X-Ray Photoelectrons Ejected from theKandLAtomic Energy-Levels

A C.T.R. Wilson expansion-chamber was used to study the space-distribution of photoelectrons ejected from a gas by monochromatic x-rays. In agreement with Auger, and Watson and Van den Akker a more isotropic space-distribution was found for electrons ejected from the $L$ energy-levels than for those ejected from the $K$ energy-level. The distribution of the electrons from the $L$ energy-levels became less isotropic with an increase in frequency of the incident radiation. For a given radiation, the average forward momentum of the electrons from the $K$ energy-level was found to decrease with an increase in the binding energy of the parent atom. Within experimental error, however, for electrons from the $K$ energy level, even for different binding energies, the average forward momentum remained the same for a given velocity of ejection of the electron. The average forward momentum of electrons from the $L$ energy-level was greater than that for electrons from the $K$ energy-level for a given velocity of ejection. The space-distribution of electrons from the $K$ energy-level was in fair accord with the recent results of quantum mechanics.