Threshold laws in delayed emission: an experimental approach
Laboratoire de Spectrométrie Ionique et Moléculaire, UMR CNRS 5579, Université Lyon 1, 69622 Villeurbanne, France
Corresponding author: a email@example.com
Revised: 16 October 2006
Published online: 24 May 2007
Delayed emission is a common decay process for very excited complex systems where the excitation energy is, to a large extent, statistically distributed over all accessible degrees of freedom. A rich variety of delayed decay processes is found in complex molecules and clusters such as thermionic emission, evaporation of heavy fragments or blackbody radiation. In this article, we present the general threshold laws that govern the kinetic energy spectrum of matter particles (electrons or fragments) ejected from spherically symmetric species in such processes, and we illustrate these laws by experimental results obtained in photoelectron and photoion spectroscopy. Deviations from simple laws for non spherical species are also evidenced.
PACS: 36.40.-c – Atomic and molecular clusters / 36.40.Qv – Stability and fragmentation of clusters / 33.60.Cv – Ultraviolet and vacuum ultraviolet photoelectron spectra
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2007