Experimental KLM + KLN Auger spectrum of Cu

Abstract

The KLM+KLN Auger electron spectrum of Cu (Z=29) emitted in the electron capture decay of radioactive 65Zn in a solid matrix was investigated for the first time using a combined electrostatic electron spectrometer adjusted to the 7eV instrumental resolution. Energies and relative intensities of nine resolved spectrum components were determined and compared with theoretical expectations. An agreement within 3σ was found between the semi-empirical predictions for the KLM transition energies by Larkins and the experimental data with the exception of the weak (KL2M4,5+KL2N1) and (KL3M4,5+KL3N1) lines where the differences reached 5σ. From a comparison of the measured relative KLM transition intensities with available theoretical results a conclusion was derived that calculations of the KLM transition rates at Z=29 should be based on intermediate coupling of angular momenta and take into account relativistic effects.