摘要:

The synchrotron X‐ray results reported here are from the first high‐resolution triple‐crystal diffraction experiments performed at the Australian National Beamline Facility (ANBF). At the centre of the ANBF is a multipurpose high‐resolution two‐axis vacuum X‐ray diffractometer. The Si(111) sample studied has been implanted with B+ions through a one‐dimensional SiO2strip pattern with a 5.83 μm period and 4 μm open region, to produce a sample with a periodic superstructure in the lateral direction. The triple‐crystal data were collected in the form of two‐dimensional intensity maps in the vicinity of the 111 Bragg peak. Results collected in both air and vacuum are compared, as are results with and without the oxide layer. The data collected in vacuum indicate that it is possible at the ANBF to measure lattice distortions perpendicular to the sample surface with

ISSN:1600-5767    

DOI:10.1107/S0021889894010101

出版商:International Union of Crystallography    

年代:1995

数据来源: WILEY

摘要:

Newly observed diffraction phenomena that appear in the transmitted divergent‐beam (pseudo‐Kossel) patterns given by perfect or nearly perfect crystals are reported. They are seen within the areas of overlapping intensity distributions where two or more Kossel lines cross. The pseudo‐Kossel patterns were generated using a scanning electron microscope to produce a small X‐ray source (diameter<10 μm) within a 2 μm‐thick copper film coating single surfaces of polished, plate‐shaped, nearly perfect diamond specimens. Experimental conditions determined that the observed width of Kossel lines was dominated by CuKα1wavelength spread. Imposed upon the overall area of crossing of these dispersion‐broadened lines, there appear fine streaks of enhanced transmitted intensity that delineate loci along which, as the wavelength changes,coherentmultiple diffraction occurs, accompanied by enhanced Borrmann transmission. These fine‐scale features, only a few arcseconds in angular width, add markers to the broad‐line Kossel pattern that should be exploitable in lattic

ISSN:1600-5767    

DOI:10.1107/S0021889894011118

出版商:International Union of Crystallography    

年代:1995

数据来源: WILEY

ISSN:1600-5767    

DOI:10.1107/S0021889894010642

出版商:International Union of Crystallography    

年代:1995

数据来源: WILEY

ISSN:1600-5767    

DOI:10.1107/S0021889894014226

出版商:International Union of Crystallography    

年代:1995

数据来源: WILEY

ISSN:1600-5767    

DOI:10.1107/S0021889895099675

出版商:International Union of Crystallography    

年代:1995

数据来源: WILEY

ISSN:1600-5767    

DOI:10.1107/S0021889895099638

出版商:International Union of Crystallography    

年代:1995

数据来源: WILEY