X-ray-diffraction studies of acoustoelectrically amplified phonons

Chapman, L. D.; Colella, R.; Bray, Ralph

doi:10.1103/physrevb.27.2264

Cited by 22 publications

(12 citation statements)

References 22 publications

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“…Since the pioneering papers of Fox & Carr (1931), Langer (1931) and Barrett & Howe (1932), diffraction of X-rays and neutrons in a crystal volume modulated by ultrasonic waves has attracted a large number of experimental and theoretical studies (White, 1950;Saccocio et al, 1967;Haruta, 1967;Carlson et al, 1971;Kö hler et al, 1974;LeRoux et al, 1975LeRoux et al, , 1976Entin & Assur, 1981;Chapman et al, 1983;Punegov & Pavlov, 1994). The observed experimental rocking curves were explained using the dynamical scattering theory (Kö hler et al, 1974;Authier, 2001), including the phenomenon of X-ray acoustic resonance (Entin & Assur, 1981;Punegov & Pavlov, 1994).…”

Section: Introductionmentioning

confidence: 99%

Coherent and diffuse X-ray scattering in crystals modulated by a surface acoustic wave

Пунегов¹,

Nesterets

Рощупкин

2010

J Appl Cryst

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Equations describing the coherent and diffuse scattering in a crystal modulated by a surface acoustic wave (SAW) are derived using the dynamical X‐ray diffraction theory. The effect of depth attenuation of the Rayleigh surface wave amplitude on the crystal rocking curve profiles is investigated. Results of the numerical simulation of the dynamical diffraction in a mosaic crystal modulated by a SAW, taking into account a block size distribution, are presented. It is shown that the diffuse scattering is distributed in the reciprocal space not only in the vicinity of the main diffraction peak but also about the satellite diffraction peaks, and this distribution depends on the size fluctuations of the crystal defects. Theoretical reciprocal space maps and rocking curves are compared with the corresponding experimental results.

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Section: Introductionmentioning

confidence: 99%

Coherent and diffuse X-ray scattering in crystals modulated by a surface acoustic wave

Пунегов¹,

Nesterets

Рощупкин

2010

J Appl Cryst

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“…1-3 The choice of Si is due to the availability of large perfect crystals at a low cost, having relatively high radiation resistance. [7][8][9][10] In an important case of Bragg diffraction, surface acoustic waves ͑SAWs͒ are of special interest because they are excited in the thin near-surface crystal layer having a thickness compatible with the x-ray extinction length. Recently diamond crystals have been tested as candidates for the design of high-heat-load transmission ͑Laue͒ crystal monochromators for undulator beamlines.…”

Section: Introductionmentioning

confidence: 99%

Acoustically adjustable LiNbO3 double-crystal monochromator for synchrotron radiation

Polikarpov

Oliveira

Zolotoyabko

1999

Review of Scientific Instruments

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First experiments with the acoustically controlled LiNbO3 double-crystal monochromator for synchrotron radiation have been performed on the diffraction beamline of the Brazilian National Synchrotron Light Laboratory. In order to modify x-ray optical properties of LiNbO3 crystals, 290 MHz surface acoustic waves were generated with the aid of interdigital transducers, fabricated on the polished crystal surfaces by using microelectronics technology. It was shown that by the appropriate choice of diffraction planes, the LiNbO3 double-crystal monochromator can be used for both high-flux and high-resolution applications. Surface acoustic waves allow adjustment of an angular width of diffraction profile to a divergence of the incident synchrotron radiation, optimizing matching conditions for x rays of different wavelengths. Diffraction measurements under surface acoustic wave excitation demonstrated that the parameters of the x-ray beam issuing from the monochromatization system are indeed acoustically controlled, providing a 2–2.5-fold broadening of the diffraction profile and a 1.5-fold gain in the maximum diffraction intensity.

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“…In many cases, deformation-induced periodic modulation of atomic and electron densities exhibits properties of an artificial superlattice with parameters (period and amplitude) that could be easily and reproducibly varied. For example, high-resolution X-ray diffraction spectra from an acoustic superlattice contain angular satellites due to inelastic scattering with emission and absorption of ultrasound phonons (Kohler et al, 1974;Entin, 1979;Entin & Assur, 1981;Chapman et al, 1983). The posi-tions of satellites are determined by the momentum conservation law, i.e.…”

Section: Introductionmentioning

confidence: 99%

X-ray Bragg Diffraction in a Strong Acoustic Field

Zolotoyabko¹,

Polikarpov²

1998

J Appl Cryst

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High-resolution X-ray diffraction spectra were recorded using LiNbO3-based acousto-optical devices under surface acoustic wave excitation with a frequency of 290 MHz. Triplicate growth of the spectral angular width and a 2.5 increase in the integrated diffraction intensity were detected at a maximum acoustic amplitude of 0.17 nm. The experimental results are compared with theoretical simulations. Bearing in mind possible applications of these findings to synchrotron radiation monochromators, special attention is paid to an analysis of the maximum intensity gains which are achievable in this kind of experiment.

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X-ray-diffraction studies of acoustoelectrically amplified phonons

Cited by 22 publications

References 22 publications

Coherent and diffuse X-ray scattering in crystals modulated by a surface acoustic wave

Coherent and diffuse X-ray scattering in crystals modulated by a surface acoustic wave

Acoustically adjustable LiNbO3 double-crystal monochromator for synchrotron radiation

X-ray Bragg Diffraction in a Strong Acoustic Field

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