德国图宾根大学Frank Schreiber教授9月28日上午学术报告

发布时间:2017-09-25访问量:211设置

报告人:Frank Schreiber教授Institut für Angewandte Physik, Universit?t Tübingen, 72076 Tübingen, Germany

报告题目:X-ray standing waves for structurally resolved spectroscopy

报告时间:10:00 AM, Sep. 28th (Thursday)

报告地点:909-B

  

Abstract  

In this lecture, we outline the opportunities provided by a technique calledX-ray standing waves (XSW).If an incoming X-ray wave and a reflected X-ray wave,e.g. caused by Bragg diffraction from the lattice planes of a crystal,overlap, they can form a standing wave pattern.This gives rise to an X-ray intensity pattern,which is modulated in space on the length scale of the lattice planes,i.e. sub-nanometers.Importantly, it can be employed to excite characteristic transitionsin a crystal or on the surface of a crystal.The intensity of these transitions can then be very finely modulatedby tuning the incoming beam through the Bragg condition.It turns out that these can be used to determine the structure of adsorbatesor thin films with a precision better than 0.01 nanometers.We will discuss examples of organic semiconductorson metal contacts in which the exact geometric structure including the distortionof the molecules is a key to the understanding of interface dipoles andassociated workfunction changes as well as electron injection efficienciesin devices.

  


 

Biography

  • 1987-1992 undergraduate studies in physics at Bochum University

  • 1992 Diploma (with distinction)      

  • 1995 Dr. rer. nat. (with distinction) at Bochum University

  • 1995/1996 Research in Paris and Prague

  • 1996-1997 Post-Doctoral Fellow at Princeton University

  • 1998-2002 Research Assistant in Stuttgart (University and MPI-MF)

  • 2002 Habilitation in Stuttgart

  • 2002-2004 University Lecturer at the University of Oxford and Fellow of Wadham College

  • since December 2004 Professor (Chair) at Tübingen University

  

Contact: Steffen Duhm

  

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