Seminars Archive
Novella Piancastelli
Abstract
Thursday, March 2, 2000, 11:30
Seminar Room, ground floor, Building "T"
Sincrotrone Trieste, Basovizza
I.D. required for external visitors
New trends in gas-phase resonant photoemission at third-generation light
sources.
Novella Piancastelli
(Department of Chemical Sciences and Technologies, University
"Tor Vergata", Rome, ITALY)
ABSTRACT
The advent of third-generation synchrotron light sources together with
high resolution electron energy analyzers has provided unprecedented opportunities
in the study of electronic structure and nuclear dynamics of isolated molecules.
Potential curves of core-excited molecules, vibrational structure of both
the intermediate and the final states, interference phenomena and the interplay
between electron decay and resonant fragmentation can be investigated in
great detail. Several examples will be illustrated, including: the first
direct experimental evidence of ultrafast dissociation in core-excited
water; non-Franck-Condon behaviour and breakdown of the participator-spectator
model in core-excited nitrogen; Doppler shift measured in the electron
decay of core-excited oxygen; subnatural linewidth pseudoabsorption measurements
of core-excited oxygen; exchange splitting of the O1ss* resonance
in oxygen. The experiments have been performed at the atomic and molecular
physics beam line I411 at MAX-II, MAX-Lab, Lund, Sweden, and at the Gas
Phase beam line at Elettra, Trieste, Italy.
