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Title: Innovative diffraction gratings for high-resolution resonant inelastic soft x-ray scattering spectroscopy

Abstract

High-resolution Resonant Inelastic X-ray Scattering (RIXS) requires diffraction gratings with very exacting characteristics. The gratings should provide both very high dispersion and high efficiency which are conflicting requirements and extremely challenging to satisfy in the soft x-ray region for a traditional grazing incidence geometry. To achieve high dispersion one should increase the groove density of a grating; this however results in a diffraction angle beyond the critical angle range and results in drastic efficiency loss. The problem can be solved by use of multilayer coated blazed gratings (MBG). In this work we have investigated the diffraction characteristics of MBGs via numerical simulations and have developed a procedure for optimization of grating design for a multiplexed high resolution imaging spectrometer for RIXS spectroscopy to be built in sector 6 at the Advanced Light Source (ALS). We found that highest diffraction efficiency can be achieved for gratings optimized for 4{sup th} or 5{sup th} order operation. Fabrication of such gratings is an extremely challenging technological problem. We present a first experimental prototype of these gratings and report its performance. High order and high line density gratings have the potential to be a revolutionary new optical element that should have great impact inmore » the area of soft x-ray RIXS.« less

Authors:
; ; ; ;  [1]
  1. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720 (United States)
Publication Date:
OSTI Identifier:
22608400
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1741; Journal Issue: 1; Conference: SRI2015: 12. international conference on synchrotron radiation instrumentation, New York, NY (United States), 6-10 Jul 2015; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ADVANCED LIGHT SOURCE; COMPUTERIZED SIMULATION; DESIGN; DIFFRACTION GRATINGS; DISPERSIONS; EFFICIENCY; LAYERS; OPTIMIZATION; RESOLUTION; SOFT X RADIATION; SPECTROMETERS; SPECTROSCOPY; X-RAY DIFFRACTION

Citation Formats

Voronov, D.L., Warwick, T., Gullikson, E. M., Salmassi, F., and Padmore, H. A. Innovative diffraction gratings for high-resolution resonant inelastic soft x-ray scattering spectroscopy. United States: N. p., 2016. Web. doi:10.1063/1.4952887.
Voronov, D.L., Warwick, T., Gullikson, E. M., Salmassi, F., & Padmore, H. A. Innovative diffraction gratings for high-resolution resonant inelastic soft x-ray scattering spectroscopy. United States. doi:10.1063/1.4952887.
Voronov, D.L., Warwick, T., Gullikson, E. M., Salmassi, F., and Padmore, H. A. Wed . "Innovative diffraction gratings for high-resolution resonant inelastic soft x-ray scattering spectroscopy". United States. doi:10.1063/1.4952887.
@article{osti_22608400,
title = {Innovative diffraction gratings for high-resolution resonant inelastic soft x-ray scattering spectroscopy},
author = {Voronov, D.L. and Warwick, T. and Gullikson, E. M. and Salmassi, F. and Padmore, H. A.},
abstractNote = {High-resolution Resonant Inelastic X-ray Scattering (RIXS) requires diffraction gratings with very exacting characteristics. The gratings should provide both very high dispersion and high efficiency which are conflicting requirements and extremely challenging to satisfy in the soft x-ray region for a traditional grazing incidence geometry. To achieve high dispersion one should increase the groove density of a grating; this however results in a diffraction angle beyond the critical angle range and results in drastic efficiency loss. The problem can be solved by use of multilayer coated blazed gratings (MBG). In this work we have investigated the diffraction characteristics of MBGs via numerical simulations and have developed a procedure for optimization of grating design for a multiplexed high resolution imaging spectrometer for RIXS spectroscopy to be built in sector 6 at the Advanced Light Source (ALS). We found that highest diffraction efficiency can be achieved for gratings optimized for 4{sup th} or 5{sup th} order operation. Fabrication of such gratings is an extremely challenging technological problem. We present a first experimental prototype of these gratings and report its performance. High order and high line density gratings have the potential to be a revolutionary new optical element that should have great impact in the area of soft x-ray RIXS.},
doi = {10.1063/1.4952887},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1741,
place = {United States},
year = {Wed Jul 27 00:00:00 EDT 2016},
month = {Wed Jul 27 00:00:00 EDT 2016}
}