Accession Number : ADA265265


Title :   X-Ray Standing Waves on Surfaces


Corporate Author : CORNELL UNIV ITHACA NY DEPT OF CHEMISTRY


Personal Author(s) : Abruna, Hector D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a265265.pdf


Report Date : Jan 1993


Pagination or Media Count : 20


Abstract : The x-ray standing wave technique is a sensitive tool for determining the position of atoms within a crystal, adsorbed onto a surface or distributed within the crystal or at the interface. The technique is based on the x-ray standing wave field that arises as a result of the interference of coherently related incident and reflected plane waves and is described by the theory of dynamical diffraction of x-rays. When two coherently related traveling plane waves having the same wavelength pass through each other their superposition results in a standing wave of period D = lambda/2 sin theta; where lambda is the wavelength of the traveling waves, and 2 theta is the relative angle between them. The generation of a standing wave requires both an incident and a reflected wave and the letter can be generated by either Bragg diffraction or total external reflection


Descriptors :   *CRYSTAL STRUCTURE , *X RAYS , *STANDING WAVES , PHYSICAL PROPERTIES , SURFACE PROPERTIES , BRAGG ANGLE


Subject Categories : Crystallography
      Atomic and Molecular Physics and Spectroscopy


Distribution Statement : APPROVED FOR PUBLIC RELEASE