Asymmetrically cut crystals for synchrotron radiation monochromators

Rı́o, M. Sánchez del; Cerrina, F.

doi:10.1063/1.1143785

Cited by 39 publications

(25 citation statements)

References 8 publications

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“…The equivalence between a grating and an asymmetric multilayer has been noted before [2,4], demonstrated, and applied [8,9]. This equivalence is also valid in the case of diffraction from crystals, where it is well known that the diffracted x rays from an asymmetric-cut crystal are dispersed, in accordance with the grating equation [10,11]. In fact, dynamical diffraction theory can be applied with full validity to the case of asymmetric-cut multilayers, as is presented in Section 3.…”

Section: Asymmetric-cut Multilayersmentioning

confidence: 72%

High-efficiency x-ray gratings with asymmetric-cut multilayers

Bajt¹,

Chapman

Aquila³

et al. 2012

J. Opt. Soc. Am. A

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We present the fabrication and analysis of efficient and highly dispersive gratings for the x-ray and extreme ultraviolet (EUV) regime. We show that an asymmetric-cut multilayer structure can act as a near-perfect blazed grating. The precision and high line density are achieved by layer deposition of materials, which can be controlled to the angstrom level. We demonstrate this in the EUV regime with two structures made by cutting and polishing magnetron-sputtered multilayer mirrors of over 2000 bilayers thick, each with a period of 6.88 nm. These were cut at angles of 2.9°and 7.8°to the surface. Within the 3% bandwidth rocking curve of the multilayer, the angular dispersion of the diffracted wave was in agreement with the grating equation for elements with 7250 and 19,700 line pairs/mm, respectively. The dependence of the measured efficiency was in excellent agreement with a formulation of dynamical diffraction theory for multilayered structures. At a wavelength of 13.2 nm, the efficiency of the first-order diffraction was over 95% of the reflectivity of the uncut multilayer. We predict that such structures should also be effective at shorter x-ray wavelengths. Both the Laue (transmitting) and Bragg (reflecting) geometries are incorporated in our formalism, which is applied to the analysis of multilayer Laue lenses and focusing and dispersing Bragg optics.

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Section: Asymmetric-cut Multilayersmentioning

confidence: 72%

High-efficiency x-ray gratings with asymmetric-cut multilayers

Bajt¹,

Chapman

Aquila³

et al. 2012

J. Opt. Soc. Am. A

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“…Ultimate resolution in the few keV range is only achievable with silicon and quartz crystals. The minimum energy is about 1.5 and 2 keV for quartz and silicon with a calculated resolution of around 200 meV, which increases to about 500 meV at 10 keV [17,18]. With large area spherically bent crystals, resolutions were achieved of 260 meV at 1.7 keV and 330 meV at 2.4 keV for quartz 100 and silicon 111 reflections [15].…”

Section: Methodsmentioning

confidence: 99%

X-ray spectroscopy of light hadronic atoms

Gotta

2009

Hyperfine Interact

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A series of measurements on light exotic atoms has been performed over the last 15 years at the pion factory of the Paul Scherrer Institut and at CERN's antiproton facility LEAR using the cyclotron trap and a focusing Bragg crystal spectrometer. The experiments with pions reached already an accuracy close to the presently achievable technical limits. The information on antiprotons remains unsatisfactory because the studies were terminated with the shut down of LEAR. Some aspects of high resolution X-ray spectroscopy are discussed as well as relations between the elementary processes of absorption and annihilation to observables in light nuclei.

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“…[10][11][12] We will discuss only the bending of flat crystals to approximately elliptical sections, as appropriate for meridinal Bragg (reflection) geometeries. Our goal is to produce a dispersive beam that has the smallest possible focal spot and contains a broad energy bandwidth (∆E/E ≈ 0.1) with a strong linear correlation between angle and energy (to provide good energy resolution).…”

Section: Focusing Propertiesmentioning

confidence: 99%