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Dynamic x-ray diffraction by a multilayer mirror modulated with a transverse acoustic wave
V V Aristov1, A I Erko, V V Martynov
1Institute of Microelectronics Technology and High Purity Materials, Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russia.
Journal of X-Ray Science and Technology
|February 11, 2011
Summary
X-ray diffraction by acoustically modulated multilayer mirrors shows peak splitting and narrowing. Increasing sound amplitude reduces peak widths, enhancing Bragg diffraction orders for x-ray optics applications.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Optics
Background:
- Multilayer mirrors are crucial for x-ray optics.
- Acoustic modulation can alter material properties and diffraction behavior.
- Understanding dynamic diffraction is key for advanced optical devices.
Purpose of the Study:
- To analyze dynamic x-ray diffraction by multilayer mirrors under transverse acoustic modulation.
- To investigate the influence of acoustic wave amplitude and wavelength relative to extinction length.
- To characterize the resulting changes in rocking curves and peak widths.
Main Methods:
- Rigorous multiwave mode theory for dynamic diffraction analysis.
- Theoretical modeling of x-ray plane wave interaction with modulated multilayer mirrors.
- Examination of cases where acoustic wavelength (λs) is greater than extinction length (τ).
Main Results:
- Peak splitting observed in kinematic branch interactions with increasing sound amplitude for both λs < τ and λs > τ.
- Rocking curves transform into distinct rows of peaks for different diffraction orders.
- Peak widths decrease with increasing modulation amplitude, becoming narrower than in unmodulated mirrors.
Conclusions:
- Acoustic modulation provides a method to control and refine x-ray diffraction peak characteristics in multilayer mirrors.
- The observed peak splitting and narrowing offer potential for enhanced resolution in x-ray optical systems.
- This research contributes to the development of tunable x-ray optical components.
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