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Title: Hard-X-Ray Spectroscopy with a Spectrographic Approach

Abstract

Hard-x-ray spectroscopy relies on a suite of modem techniques for studies of vibrational, electronic, and magnetic excitations in condensed matter. At present, the energy resolution of these techniques can be improved only by decreasing the spectral window of the involved optics-monochromators arid analyzers- thereby sacrificing the intensity. Here, we demonstrate hard-x-ray spectroscopy with greatly improved energy resolution without narrowing the spectral window by adapting principles of spectrographic imaging to the hard-x-ray regime. Similar to Newton's classical prism, the hard-x-ray spectrograph disperses different "colors"-i.e., energies-of x-ray photons in space. Then, selecting each energy component with a slit ensures high energy resolution, whereas measuring x-ray spectra with all components of a broad spectral window keeps the intensity. We employ the principles of spectrographic imaging for phonon spectroscopy. Here the new approach revealed anomalous soft atomic dynamics in α-iron, a phenomenon which was not previously reported in the literature. Finally, we argue that hard-x-ray spectrographic imaging also could be a path to discovering new physics in studies of electronic and magnetic excitations.

Authors:
 [1];  [2];  [3];  [1];  [1]
  1. European Synchrotron Radiation Facility (ESRF), Grenoble (France)
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  3. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1574953
Alternate Identifier(s):
OSTI ID: 1559391
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 123; Journal Issue: 9; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Chumakov, Aleksandr I., Shvyd’ko, Yuri, Sergueev, Ilya, Bessas, Dimitrios, and Rüffer, Rudolf. Hard-X-Ray Spectroscopy with a Spectrographic Approach. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.123.097402.
Chumakov, Aleksandr I., Shvyd’ko, Yuri, Sergueev, Ilya, Bessas, Dimitrios, & Rüffer, Rudolf. Hard-X-Ray Spectroscopy with a Spectrographic Approach. United States. doi:10.1103/PhysRevLett.123.097402.
Chumakov, Aleksandr I., Shvyd’ko, Yuri, Sergueev, Ilya, Bessas, Dimitrios, and Rüffer, Rudolf. Thu . "Hard-X-Ray Spectroscopy with a Spectrographic Approach". United States. doi:10.1103/PhysRevLett.123.097402.
@article{osti_1574953,
title = {Hard-X-Ray Spectroscopy with a Spectrographic Approach},
author = {Chumakov, Aleksandr I. and Shvyd’ko, Yuri and Sergueev, Ilya and Bessas, Dimitrios and Rüffer, Rudolf},
abstractNote = {Hard-x-ray spectroscopy relies on a suite of modem techniques for studies of vibrational, electronic, and magnetic excitations in condensed matter. At present, the energy resolution of these techniques can be improved only by decreasing the spectral window of the involved optics-monochromators arid analyzers- thereby sacrificing the intensity. Here, we demonstrate hard-x-ray spectroscopy with greatly improved energy resolution without narrowing the spectral window by adapting principles of spectrographic imaging to the hard-x-ray regime. Similar to Newton's classical prism, the hard-x-ray spectrograph disperses different "colors"-i.e., energies-of x-ray photons in space. Then, selecting each energy component with a slit ensures high energy resolution, whereas measuring x-ray spectra with all components of a broad spectral window keeps the intensity. We employ the principles of spectrographic imaging for phonon spectroscopy. Here the new approach revealed anomalous soft atomic dynamics in α-iron, a phenomenon which was not previously reported in the literature. Finally, we argue that hard-x-ray spectrographic imaging also could be a path to discovering new physics in studies of electronic and magnetic excitations.},
doi = {10.1103/PhysRevLett.123.097402},
journal = {Physical Review Letters},
number = 9,
volume = 123,
place = {United States},
year = {2019},
month = {8}
}

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