| Zugriffsnummer | 19918 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | X-ray bragg diffraction in asymmetric backscattering geometry |
| Autor(in); Institution |
Shvyd'ko, Yu. V.; Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois, USA
Lerche, M.; University of Illinois at Urbana-Champaign, Urbane, Illinois, USA; Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois, USA
Kuetgens, Ulrich; 4.3, Quantenoptik und Längeneinheit, PTB-Braunschweig
Rüter, H. D.; Universität Hamburg, Institut für Experimentalphysik, Hamburg, GERMANY
Alatas, A.; Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois, USA
Zhao, J.; Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois, USA
|
| Quelle/Jahr | Physical Review Letters: 97 (2006), 235502-1 - 235502-4 |
| ISSN | 0031-9007 (PRINT) ; 1079-7114 (ONLINE) |
| DOI | |
| URL | |
| Verlag | Ridge, NY: APS |
| Klassifikationscode | PACS: 61.10.-i ; PACS: 41.50.+h ; PACS: 42.25.Fx |
| Zusammenfassung | We observe three effects in the Bragg diffraction of x rays in backscattering geometry from asymmetrically cut crystals. First, exact Bragg backscattering takes place not at normal incidence to the reflecting atomic planes. Second, a well-collimated (≈ 1 μrad) beam is transformed after the Bragg reflection into a strongly divergent beam (230 μrad) with reflection angle dependent on x-ray wavelength - an effect of angular dispersion The asymmetrically cut crystal thus behaves like an optical prism, dispersing an incident collimated polychromatic beam. This dispersion rate is ≈ 8.5 mrad/eV. Third, parasitic Bragg reflection accompanying Bragg backreflection are suppressed. These effects offer a radically new means for monochromatization of x rays not limited by the intrinsic width of the bragg reflection. |
