Resonant diffraction of synchrotron radiation in rubidium dihydrophosphate crystals

Journal Article · Mon Mar 15 04:00:00 EDT 2010 · Crystallography Reports

DOI:https://doi.org/10.1134/S1063774510020021· OSTI ID:22051233

Mukhamedzhanov, E Kh; Kovalchuk, M V; Borisov, M M ^[1]; Ovchinnikova, E N; Troshkov, E V ^[2]

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1. Russian Research Centre 'Kurchatov Institute' (Russian Federation)
2. Moscow State University (Russian Federation)

Purely resonant Bragg reflections 006, 55bar 0, and 666 in a rubidium dihydrophosphate (RbH{sub 2}PO{sub 4}) crystal at the K edge of rubidium have been experimentally and theoretically investigated. These reflections remain forbidden when the resonant dipole-dipole (E1E1) contribution to the resonant atomic factor is taken into account; they may be due to the dipole-quadrupole (E1E2) transitions as well as to the anisotropy atomic factor, which is caused by thermal atomic displacements (thermally induced contribution) and/or local jumps of hydrogen atoms. A numerical simulation showed that, at room temperature (experimental conditions), the thermally induced contribution to the 'forbidden' reflections is dominant.

• OSTI ID: 22051233
• Journal Information: Crystallography Reports, Journal Name: Crystallography Reports Journal Issue: 2 Vol. 55; ISSN 1063-7745; ISSN CYSTE3
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANISOTROPY
ATOMIC DISPLACEMENTS
BRAGG REFLECTION
COMPUTERIZED SIMULATION
CRYSTALS
DIFFRACTION
DIPOLES
PHOSPHATES
RUBIDIUM COMPOUNDS
SYNCHROTRON RADIATION
TEMPERATURE RANGE 0273-0400 K