北京先进光源系列邀请报告（9-2）--Inelastic x-ray scattering

Abstract: Momentum resolved inelastic x-ray scattering (IXS) is another area that received a boost in the last decade. Today, measurement of phonon branches with 1-to-3 meV resolution is possible, even under extreme conditions of pressure and temperature. The source and optics requirements of such spectrometers, and the ways to improve them will be discussed.

Anothor topic that will be discussed is the so-called resonant inelastic x-ray scattering (RIXS) that measures collective excitations of valence electrons, and their dispersion. Such measurements with 100 meV or better resolution provides detailed information about d-d electron correlations, charge transfer energy, and bandwidth of hybridized energy levels.

Biographical sketch: Dr. Ercan Alp is a senior scientist at the Advanced Photon Source of the Argonne National Laboratory. He is also a visiting professor at University of Illinois at Urbana, and Northern Illinois University.

Dr. Alp received BSc and MSc degrees from the Middle East Technical University in Ankara, and PhD from Southern Illinois University. He is a member of Argonne National Laboratory since 1984. He was a post-doctoral researcher with Dr. G. Shenoy, and worked with the first group of scientists to prepare the scientific case for the Advanced Photon Source. He is known for his work in nuclear resonant x-ray spectroscopy using synchrotron radiation since 1980, when he spent a year in Hamburg as an IAEA fellow with Prof. E. Gerdau. He formed the inelastic x-ray scattering group at the APS, and he was responsible for the design and construction of the 3-ID beamline, dedicated to nuclear resonant and inelastic x-ray scattering, together with Drs. W. Sturhahn, T. Toellner, and H. Sinn. The discovery of the nuclear resonant inelastic x-ray scattering to phonon density of states is among the highlights of this period.

Dr. Alp, together with Dr. J. Hill of Brookhaven National Laboratory organized the first workshop on inelastic x-ray scattering that led to successful proposals to DOE and NSF. He served as the Managing Director of IXS-CDT project until its completion in 2007.

Dr. Alp was a member of Canadian Light Source Science Advisory Committee between 1999-2009. Together with Dr. H. Winick (SLAC), he chaired the first Scientific Committee for the SESAME project, and helped write the scientific case for a synchrotron source in the Middle East, organized workshops to develop a scientific user community. He continues to serve as a member of the Technical Committee.

Dr. Alp is the chair of the International Science Advisory Committee for the Turkish Accelerator Center. He participates in national and international panels, including Isotope Sub-committee of the DOE Nuclear Science Advisory Committee, many DOE and NIH panels, Beamline Advisory Committees for NSLS-II at Brookhaven and PETRA-III at DESY. He is recently elected to as the vice-chairman of the Forum for International Physics of the American Physical Society. He hosts international scientists and directs PhD theses for graduate students.