Dec 5, 2005 15:30
Esen Ercan Alp, Argonne National Laboratory
on State of art in x-ray science and sources: a snapshot in 2005


X-ray science, now 110 years old, is surprisingly full of new and exciting possibilities. Advances in theoretical understanding of the interaction between photons, and the charge and spin of electrons and nuclei, new accelerator - based sources, breakthroughs in crystal and thin-film based optics and timeresolved one or two dimensional detectors combined created a fertile ground over which thousands of scientists are working. Traditional boundaries between x-ray scattering, x-ray spectroscopy and x-ray imaging have all but disappeared, giving way to new areas like spectromicroscopy, whereby diffraction, fluorescence and absorption spectroscopy, and microfocusing are combined to provide powerful x-ray nanoscopes.

In this presentation, I will present a snapshot of todays synchrotron radiation based x-ray world, describe the new sources existing and on the horizon, and explain how they have changes the way we use x-rays in biology, geology, physics, chemistry, archeology, as well as in cross-disciplinary areas like environmental science, soil science, forensic science, and materials science.

While the presentation is an overview, I will provide ample specific examples, and focus on experimental aspects of each topic. Among the topics I would like to discuss are measurement of phonon density of states of materials under high pressure and temperature approaching to the conditions near the center of the earth, measurement of sound velocity and dynamic viscosity of liquid sapphire, boron and silicon, phonon confinement in multilayers, measurement of valence and spin change under high pressure, vibrational spectroscopy of proteins and model porphyrins.