Table of Contents
Laser Chemistry
Volume 3, Issue 1-6, Pages 85-96

On the Extraction of Time Information From Energy-Resolved Experiments

Laboratoire des Collisions Atomiques et Moléculaires, Bâtiment 351, Université de Paris-Sud, Orsay 91405, France

Copyright © 1983 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


It is well known that in principle energy-resolved and time-resolved experiments provide complementary information. A few examples are reviewed where the time evolution of rapidly relaxing molecular systems is or could be better studied by energy-resolved experiments: (1) the evolution of a pair of resonances coupled with each other through a set of continua, (2) an irreversible relaxation of the intermediate state in the two-photon excitation of a polyatomic molecule, and (3) the derivation of a “dissociation time” from the angular distribution of fragments from photodissociation by linearly polarized light. In the first case it is shown how all parameters necessary for a time-dependent description may be obtained from the measurement, as functions of the excitation wavelength, of both the total absorption cross section across the resonances and the partial cross section for a single exit channel. In the last two cases the relevance of a description in terms of an “eigentime” of the molecule is demonstrated.