Seminars Archive
Robert W. Schoenlein
Abstract
Monday, May 7, 2001, 15:30
Seminar Room, ground floor, Building "T"
Sincrotrone Trieste, Basovizza
Ultrafast X-ray Science at the Advanced Light Source: Recent Results and
Future Plans.
Robert W. Schoenlein
(Lawrence Berkeley National Laboratory )
ABSTRACT
An important research frontier is the application of x-ray tecniques
such as diffraction and EXAFS to investigate structural dynamics
(atomic motion and the making and breaking of chemical bonds) which
drive phase transitions in solids, chemical reactions, and
rapid biological processes. The fundamental time scale for such processes
is an atomic vibrational period, ~100 fs, which is
nearly three oders of magnitude beyond the present capabilities of
synchrotrons. We have recently generated femtosecond
synchrotron pulses from the Advanced Light Source using ultrashort
laser pulses to manipulate the stored electron beam.
We are presetly commissioning a bend-magnet beamline with 100 fs time
resolution for ultrafast x-ray science, and have proposed
a femtosecond undulator beamline for the ALS. This talk will describe
the techniques used in generating femtosecond x-rays
from a synchrotron and will provide an overview of the research program
in ultrafast x-ray science that is being developed at the ALS.
