NSLS-II User Workshop Breakout Sessions F, G, H, I, J

July 18, 2007

> User Workshop Home  |  Sessions A, B, C, D, E  |  Science-Based Discussion Groups

 
Session F: Inelastic X-ray Scattering

Chairs: J. Hill, Y. Cai

The technique of inelastic x-ray scattering allows the study of dynamics over a wide range of momentum and energy transfer. As a result, it has had growing impact in fields as diverse as condensed matter physics, the life sciences and geosciences. At NSLS-II the goal is to achieve 0.1 meV energy resolution, which will open up new areas of research for this technique. In addition, it is envisaged that there will also be ~1 meV and ~50 meV instruments at the facility. This session seeks to explore the science that such capabilities will enable, with particular attention on the very highest resolutions achievable and to begin to determine the technical requirements that these scientific goals would place on the instruments. Invited speakers include Alessandro Cunsolo (INFM-CNR) who will address the new opportunities presented by 0.1 meV resolution, Guilio Monaco (ESRF) who will review the present state-of-the-art at ~1 meV and look to the future, and Clement Burns (Western Michigan University) who will speculate on the scientific and technical challenges presented by these capabilities, including the study of electronic excitations at the higher energy resolutions. There will also be an extended discussion session in which input from the attendees will be actively sought.

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Session G: Hard Coherent Scattering and XPCS/SAXS

Chair: R. Pindak

Recent advances in the production of synchrotron radiation has fostered the development of experimental methods that utilize coherent x-rays. Applications of these methods range from studies of dynamics in disordered systems to lensless imaging of nanostructures. Expected to deliver nearly two orders of magnitude higher coherent x-ray flux in the hard x-ray range compared to the existing synchrotron sources, NSLS-II will become an exciting ground for these relatively young research fields to grow. This breakout session will explore new scientific opportunities that NSLS-II will make possible for x-ray photon spectroscopy and more broadly x-ray fluctuation spectroscopy, as well as coherent x-ray diffraction imaging. Instrumentation needed for pursuing these opportunities will also be discussed.

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Session H: XAFS

Chair: C. Nelson

X-ray absorption fine structure (XAFS) is a spectroscopic technique that provides information about the electronic and structural properties of matter on the atomic scale, and has achieved widespread use in diverse fields. In this session, the goals are to begin to develop the scientific mission and the technical capabilities of an XAFS beamline, which will be built on a damping wiggler source as a part of the NSLS-II construction project. The session will begin with an invited talk, entitled Disordered Matter at High P and T: A Challenge for X-ray Absorption Spectroscopy, presented by Adriano Filipponi (University of LAquila, Italy). Paul Northrup (BNL) will then discuss a preliminary design of the XAFS beamline for NSLS-II, which will be followed by an hour-long discussion period during which attendees are encouraged to provide input.

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Session I: Bio-SAXS

Chair: M. Allaire

In recent years there has been an increasing number of scientists exploiting Small- and Wide- Angle X-ray Scattering in the study of biological materials. Studies such as overall shape determination, protein-protein interactions, biophysical characterization of membrane protein and their environments, secondary structure information and the potential use of this technique as a tool for ligand discovery could all contribute to the understanding of biological functions. The aim of the Biological SAXS/WAXS breakout session is to learn about the advantages to build such a beamline at NSLS-II.

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Session J: Photoemission Spectroscopy

Chairs: E. Vescovo, T. Valla

Angle-Resolved Photoemission Spectroscopy (ARPES) represents an extremely powerful tool for studying anisotropic crystalline materials because it is capable of providing a complete momentum-resolved picture of the occupied electronic states. With recent advances in energy and momentum resolution, the technique is now able to resolve the effects of interaction of the electrons with other excitations in condensed matter systems. This is providing the foundation for a microscopic understanding of these interactions in both conventional systems and exotic strongly correlated materials. This workshop will discuss the technical capabilities of new ARPES instrumentation to be developed at NSLS-II in relation to the scientific questions that the new facility will be capable of exploring.

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