Séminaire du Lundi 4 Juin à 11H30

 IMPMC, Université P. et M. Curie, 4, Place Jussieu, 75005 Paris

Salle de Conférence, 4ème étage, Tour 22-23, Salle 1

INVESTIGATING EXTREME STATES OF MATTER BY X-RAY ABSORPTION SPECTROSCOPY

Sakura PASCARELLI (ESRF, BP220, F-38043 Grenoble, France)

Résumé:

The European Synchrotron Radiation Facility is undergoing an important
upgrade program. Eight new beamlines will become operational between 2012 and
2016. One of the beamlines is UPBL11, designed to provide conditions to perform
time resolved and extreme conditions x-ray absorption spectroscopy.
UPBL11 hosts two energy dispersive x-ray absorption spectrometers coupled
to two experimental stations, and will become operational in 2012. This instrument
will provide new opportunities for investigating matter at extreme conditions of
pressure, temperature and magnetic field, including kinetic studies of chemical
reactions at high pressure and temperature, and investigation of extreme states of
matter maintained only over very short periods of time.
I will make an overview of recent results obtained on the former energy
dispersive XAS beamline ID24 in the area of extreme conditions. Examples cover
studies of chemical reactions that occur in the interior of planets, the investigation of
pressure induced collapse of ferromagnetism in 3d metals, and first attempts to
probe the electronic and local structure in melts at high pressures. Perspectives for
the investigation of laser-shocked matter are also discussed.