Observation of sagittal X-ray diffraction by surface acoustic waves in Bragg geometry

Vadilonga, Simone; Zizak, Ivo; Рощупкин, Д. В.; Емелин, Е. В.; Petsiuk, Andrei; Leitenberger, W.; Erko, Alexei

doi:10.1107/s1600576717002977

Cited by 8 publications

(7 citation statements)

References 32 publications

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“…CRLs enable the observation of diffraction satellites in the focal plane. It was shown by Vadilonga, Zizak, Roshchupkin, Evgenii et al (2017) that diffraction orders can be observed at large distances with a CCD camera if use is made of short-wavelength SAWs. In our case, a SAW wavelength of Ã = 3 mm and a distance of 120 cm after the acoustically modulated crystal enabled the observation of diffraction orders and examination of the dependence of their intensities on the amplitude of the input signal on the IDT in the range U = 0-20 V. Fig.…”

Section: X-ray Bragg Diffraction By Acoustically Modulated Crystals Imentioning

confidence: 99%

X-ray diffraction by surface acoustic waves

et al. 2021

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The possibilities are presented of X-ray diffraction methods for studying the propagation of surface acoustic waves (SAWs) in solids, including diffraction under total external reflection conditions and Bragg diffraction, using acoustically modulated X-ray multilayer mirrors and crystals. SAW propagation was studied using both meridional and sagittal diffraction geometries where the SAW wavevectors and X-ray photons are collinear or perpendicular, respectively. SAW propagation in a crystal leads to sinusoidal modulation of the crystal lattice and the appearance of diffraction satellites on the rocking curve. The intensities and angular positions of these diffraction satellites are determined by the SAW wavelength, amplitude and attenuation. Therefore, diffraction methods allow the analysis of the SAW propagation process and determination of SAW parameters. The influence of X-ray energy on diffraction by acoustically modulated crystals is studied for the first time. It is shown that changes in the X-ray energy can change the angular region where diffraction satellites exist under conditions of total external reflection. By contrast, in the Bragg diffraction region changes in the X-ray photon energy lead to changes in the X-ray penetration depth into the crystal and redistribution of the diffracted intensity among diffraction satellites, but do not change the angular divergence between diffraction satellites on the rocking curve. It is also shown that, in X-ray diffraction on acoustically modulated crystals on a number of successive reflections, a decrease in interplanar spacing leads to an increase in the number of diffraction satellites and a redistribution of diffracted radiation between them.

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Section: X-ray Bragg Diffraction By Acoustically Modulated Crystals Imentioning

confidence: 99%

X-ray diffraction by surface acoustic waves

et al. 2021

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“…Different X-ray diffraction schemes are used for nondestructive experimental studies of crystals modulated by a SAW, including traditional double- (Roshchupkin et al, 2003) and triple-axis (Punegov et al, 2010) diffractometry. Recently, diffraction schemes in the sagittal Bragg geometry (Vadilonga et al, 2017), as well as schemes using the coherent diffraction of a time-resolved nanofocus synchrotron beam (Reusch et al, 2013;Nicolas et al, 2014) and with composite parabolic lenses (Roshchupkin et al, 2011), have been proposed.…”

Section: Introductionmentioning

confidence: 99%

The dynamical theory of diffraction in a crystal modulated by a surface acoustic wave in the case of spatially restricted X-ray beams

Пунегов¹

2019

J Appl Cryst

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The dynamical theory of X‐ray diffraction in a crystal modulated by a surface acoustic wave (SAW) is developed for spatially restricted beams. It is shown that this approach is applicable to X‐ray reciprocal space mapping. Rayleigh's surface‐wave model is used to describe ultrasonic excitation. Based on the recurrent relations, a numerical simulation of the dynamical diffraction in a crystal modulated by a SAW is performed. Within the framework of the triple‐axis diffraction scheme, the effect of the instrumental function on X‐ray diffraction data is studied.

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“…Pulsed laser beam is introduced into the beamline before the sample chamber, and can be focussed to the same spot at the sample. Di erent X-ray detectors are mounted outside of the vacuum and can be rotated up to scattering angle of 90 • (Helmholtz-Zentrum Berlin für Materialien und Energie, 2016; Iurchuk et al, 2016;Navirian et al, 2014;Roshchupkin et al, 2016;Vadilonga et al, 2017).…”

Section: Instrument Applicationmentioning

confidence: 99%