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Full-solid-angle photoelectron diffraction from bulk and surface atoms of clean W(110)

Technical Report ·
DOI:https://doi.org/10.2172/603661· OSTI ID:603661
 [1];  [1];  [2];  [1];  [3];  [4];  [4];  [4];
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Davis, CA (United States). Dept. of Physics
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); ICMM-CSIC, Madrid (Spain)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Osaka Univ., (Japan). Dept. of Materials Physics
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
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The authors have studied the atomic structure of the clean W(110) surface by means of site-resolved scanned-angle W4f{sub 7/2} photoelectron diffraction (PD) data obtained over nearly the full 2{pi} solid angle above the surface. Prior to the availability of high-brightness sources such as the Advanced Light Source, such large high-resolution data sets were prohibitively time consuming to obtain. The well characterized W(110) system was used as a reference case to check the accuracy of structure determinations from such scanned-angle data via R-factor comparisons of experiment with theoretical multiple scattering calculations. The photoelectron kinetic energy of {approximately}40 eV used was also lower than in many prior PD studies, providing further challenges to theory. The influence of various non-structural theoretical input parameters (e.g., scattering phase shifts, electron inelastic attenuation length, and inner potential) was thus also assessed. A final optimized structure is presented, together with comments on the future applications of this method.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC03-76SF00098
OSTI ID:
603661
Report Number(s):
LBNL--39981; ON: DE97007345; CNN: Contract N00014-94-0162
Country of Publication:
United States
Language:
English

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Related Subjects

66 PHYSICS
CRYSTAL STRUCTURE
ELECTRON DIFFRACTION
MONOCRYSTALS
PHOTOELECTRON SPECTROSCOPY
TUNGSTEN