Quick measurement of crystal truncation rod profiles in simultaneous multi-wavelength dispersive mode
- Photon Factory, Institute of Material Structure Science, KEK, Tsukuba, Ibaraki (Japan)
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba (Japan)
- Department of Physics, Tokyo Gakugei University, Koganei, Tokyo (Japan)
- Japan Synchrotron Radiation Research Institute, SPring-8, Hyogo (Japan)
To conduct time-resolved measurements in the wide momentum transfer (q = 4{pi} sin{theta}/{lambda}, {theta}: the glancing angle of the x-ray beam, {lambda}: x-ray wavelength) range of interest, we developed a method that can simultaneously measure the whole profile of x-ray diffraction and crystal truncation rod scattering of interest with no need of rotation of the specimen, detector, and monochromator crystal during the measurement. With a curved crystal polychromator (Si 111 diffraction), a horizontally convergent x-ray beam having a one-to-one correlation between wavelength (energy: 16.24-23.0 keV) and direction is produced. The convergent x-ray beam components of different wavelengths are incident on the specimen in a geometry where {theta} is the same for all the x-ray components and are diffracted within corresponding vertical scattering planes by a specimen ([GaAs(12ML)/AlAs(8 ML)]{sub 50} on GaAs(001) substrate) placed at the focal point. Although {theta} is the same for all the directions, q continuously varies because {lambda} changes as a function of direction. The normalized horizontal intensity distribution across the beam, as measured using a two-dimensional pixel array detector downstream of the specimen, represents the reflectivity curve profile both near to and far from the Bragg point. As for the crystal truncation rod scattering around the 002 reflection, the diffraction profile from the Bragg peak down to reflectivity of 1.0 x 10{sup -9} was measured with a sufficient data collection time (1000-2000 s). With data collection times of 100, 10, 1.0, and 0.1 s, profiles down to a reflectivity of {approx}6 x 10{sup -9}, {approx}2 x 10{sup -8}, {approx}8 x 10{sup -8}, and {approx}8 x 10{sup -7} were measured, respectively. To demonstrate the time-resolving capability of the system, reflectivity curves were measured with time resolutions of 1.0 s while rotating the specimen. We have also measured the diffraction profile around the 113 reflection in the non-specular reflection geometry.
- OSTI ID:
- 22036767
- Journal Information:
- Journal of Applied Physics, Vol. 110, Issue 10; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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