Investigating extreme states of matter by x-ray absorption spectroscopy

Wednesday, February 29, 2012 - 3:00pm

Speaker: S.Pascarelli, ESRF, BP220, F-38043 Grenoble, France

Sakura Pascarelli received a Laurea in Physics at the University La Sapienza (Rome, Italy) and a PhD degree in Physics at the University Joseph Fourier (Grenoble, France). She has been involved with synchrotron radiation instrumentation and research for over 20 years. Her research today deals with studies on the correlation between magnetism and structure in compressed matter, using X-ray Absorption Spectroscopy and X-ray Magnetic Linear and Circular Dichroism She is presently Deputy Head of the Electronic Structure and Magnetism Group within the Experiment Division of the ESRF and also scientist in charge of the x-ray absorption spectroscopy beamlines BM23 and ID24.

Program Description

The European Synchrotron Radiation Facility is presently undergoing an important upgrade program. Within this upgrade, eight new beamlines will be constructed and will become operational between 2012 and 2016. One of the first upgrade beamlines (UPBL) is UPBL11, designed to provide state-of-the-art 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 fully operational in 2012. This instrument will provide the user community new opportunities for investigating matter at extreme conditions of pressure, temperature and magnetic field. Target experiments for the future include kinetic studies of chemical reactions at high pressure and temperature, and investigation of extreme states of matter that can be maintained only over very short periods of time.

In this presentation, 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. Future perspectives for the investigation of laser-shocked matter are also discussed.

Investigating extreme states of matter by x-ray absorption spectroscopy
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