Observation of post-collision interaction (PCI) in HBr using two-dimensional photoelectron spectroscopy

The creation and subsequent Auger decay of the 3d-1 core-hole state in HBr is studied using two-dimensional photoelectron spectroscopy. In this technique the yield of electrons is collected as a function of both photon and electron kinetic energy. The effects of post-collision interaction (PCI) observed in the energy shift of the HBr+(3d-1) photoelectron lines. The energy shifts are compared with previous experimental results on Kr. This comparison suggests that the molecular nature of HBr has little effect on the PCI energy exchange mechanism.