A multi-crystal spectrometer with a two-dimensional position-sensitive detector and contour maps of resonant Kβ emission in Mn compounds

Hayashi, Hisashi; Kawata, Masaki; Takeda, Rumi; Udagawa, Yasuo; Watanabe, Yasuhiro; Takano, Takeshi; Nanao, Susumu; Kawamura, N.

doi:10.1016/j.elspec.2004.02.148

Cited by 48 publications

(45 citation statements)

References 37 publications

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“…This method gives a direct approach to resolve the spin dependence of excited electronic states of para-, ferro-, and antiferro-magnetic materials. Figure 9a shows a Kβ1,3 (spin-down)-and Kβ′ (spin-up)-emission contour map of MnO, 9,14 where the abscissa and the ordinate are the excitation and emission energies, respectively. Here, the 1s → 3d band is visible as an island, and the existence of two prominent ridges extending parallel to the abscissa, indicated by broken lines, is unambiguous.…”

Section: ·1 Lbs Spin-selective Xafsmentioning

confidence: 99%

“…Now, such efforts have been continued throughout the world. [12][13][14][15]46,47 As an example, a schematic and a photograph of the multicrystal spectrometer that we recently constructed 15 are shown in Fig. 12.…”

Section: Possibilities Of Lbs Selective Xafs Spectroscopy To Be Openementioning

confidence: 99%

“…The development of LBS-XAFS spectroscopy since then is rather remarkable. 10,12,14,15,[24][25][26][27] In this chapter, in order to outline the LBS-XAFS method, I pick up Kα (2p → 1s) RIXS schematically shown in Fig. 1 as an example, but essentially the same formula is applicable to other RIXS processes.…”

mentioning

confidence: 99%

“…[12][13][14][15] In the present review, we survey this novel technique, lifetimebroadening-suppressed (LBS) selective XAFS spectroscopy, while paying attention to basic aspects.…”

mentioning

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Lifetime-Broadening-Suppressed Selective XAFS Spectroscopy

Hayashi

2008

ANAL. SCI.

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Every element has its characteristic absorption edge in the x-ray region, and x-ray absorption fine structure (XAFS) appears at the high-energy side. XAFS is sensitive to local electronic states and atomic environments around the absorbing atoms, and hence has been extensively employed over wide research fields as an element-specific characterization method. 1-3 XAFS spectroscopy is, however, not free from problems. One of them is that the natural widths (a few eV 4 in ordinary experiments) that originate from the finite lifetime of core holes determine the resolution of XAFS spectra.Lifetime-broadening often prevents detailed analyses, particularly, for the pre-edge region. 5 Another problem is that conventional XAFS does not have state selectivity, and therefore chemical state information is averaged, whereas in many instances, e.g. heterogeneous catalyst studies, it is of vital importance to selectively probe different forms of the elements.It is possible to circumvent these intrinsic shortcomings of XAFS spectroscopy by making use of resonant inelastic x-ray scattering (RIXS). [5][6][7][8][9][10][11][12] Here we loosely define RIXS as x-ray emissions excited with x-ray energies near an absorption edge. 6,7 Wide applications of RIXS have been so far hindered by its low intensity.However, the intensity problem in RIXS measurements is now being solved by developing highly sensitive emission spectrometers with high resolution, optimized for the use at third-generation synchrotron sources. [12][13][14][15] In the present review, we survey this novel technique, lifetimebroadening-suppressed (LBS) selective XAFS spectroscopy, while paying attention to basic aspects. Lifetime-broadening-suppressed XAFS and Resonant Inelastic X-ray ScatteringPioneer work to overcome the resolution limitation of XAFS has been made by Hämäläinen et al. at 1991. 5 They proposed partial fluorescent yield (PFY) spectroscopy to obtain LBS-XAFS, where highly monochromatic incident x-ray energy is scanned across an absorption edge while monitoring the characteristic x-rays with better resolution than the natural width. However, it was later suggested that PFY spectra cannot be viewed as genuine LBS-XAFS 16,17 (although for wide-band materials, where core-electron interactions are small, they can be a good approximation to LBS-XAFS). 6,16,18 Partially because of this indication, there were very few reports on succeeding PFY measurements. 19 An alternative method to obtain LBS-XAFS by using RIXS has been theoretically suggested by Tulkki and Åberg, 20 even before the proposition of the PFY spectroscopy (at 1982). They have stated that "the shape of the spectrum of the scattered photons may be used to disentangle bound-state excitations from continuous absorption more effectively than in ordinary Chemical and Biological Sciences, Faculty of Science, Japan Women's University, Bunkyo, Japan **PRESTO, Japan Science and Technology Agency, 5 Sanbancho, Chiyoda, Japan Lifetime-broadening-suppressed (LBS) state-selective XAFS spectra can be dedu...

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Section: ·1 Lbs Spin-selective Xafsmentioning

confidence: 99%

Section: Possibilities Of Lbs Selective Xafs Spectroscopy To Be Openementioning

confidence: 99%

mentioning

confidence: 99%

“…[12][13][14][15] In the present review, we survey this novel technique, lifetimebroadening-suppressed (LBS) selective XAFS spectroscopy, while paying attention to basic aspects.…”

mentioning

confidence: 99%

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Lifetime-Broadening-Suppressed Selective XAFS Spectroscopy

Hayashi

2008

ANAL. SCI.

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“…The spectrometer geometry allows recording a wide energy range x-ray emission spectrum at a single excitation energy and has found a variety of applications in combination with lab, synchrotron, and XFEL sources. 30,[40][41][42][43][44] Thanks to the dispersive-type of diffraction, the spectrometer geometry provides the possibility of a single-shot measurement with a total energy bandwidth ranging from a few tens to a few hundreds of eV. The development of innovative and compact von Hamos spectrometers has also benefited from the parallel advances of position-sensitive detectors.…”

Section: Introductionmentioning

confidence: 99%

A von Hamos x-ray spectrometer based on a segmented-type diffraction crystal for single-shot x-ray emission spectroscopy and time-resolved resonant inelastic x-ray scattering studies

Szlachetko

Nachtegaal

Boni

et al. 2012

Review of Scientific Instruments

167

145

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We report on the design and performance of a wavelength-dispersive type spectrometer based on the von Hamos geometry. The spectrometer is equipped with a segmented-type crystal for x-ray diffraction and provides an energy resolution in the order of 0.25 eV and 1 eV over an energy range of 8000 eV-9600 eV. The use of a segmented crystal results in a simple and straightforward crystal preparation that allows to preserve the spectrometer resolution and spectrometer efficiency. Application of the spectrometer for time-resolved resonant inelastic x-ray scattering and single-shot x-ray emission spectroscopy is demonstrated.

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Chemical Effects in Hard X‐ray Photon‐In Photon‐Out Spectra

Hayashi

2000

Encyclopedia of Analytical Chemistry

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Hard X‐ray photon‐in photon‐out techniques are targeted at applications where the sample environment cannot be freely chosen. The resultant X‐ray emission spectra are influenced by the chemical environments of the atoms involved. If high‐resolution measurements are possible, the chemical effects in the X‐ray emission spectra can provide information about the chemical states, complementary to that offered by other X‐ray spectroscopies. X‐ray emission is classified into six categories for convenience: X‐ray diagram lines, X‐ray valence‐band emission, radiative Auger effect, resonant X‐ray emission, Compton scattering, and X‐ray Raman scattering. After a brief description of the history of research on these types of emission, the chemical effects that they reveal and related topics, including high‐resolution absorption measurements and the static structure factor, are reviewed. An overview of the instrumentation employed in both laboratories and synchrotron radiation (SR) facilities is also given.

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A multi-crystal spectrometer with a two-dimensional position-sensitive detector and contour maps of resonant Kβ emission in Mn compounds

Cited by 48 publications

References 37 publications

Lifetime-Broadening-Suppressed Selective XAFS Spectroscopy

Lifetime-Broadening-Suppressed Selective XAFS Spectroscopy

A von Hamos x-ray spectrometer based on a segmented-type diffraction crystal for single-shot x-ray emission spectroscopy and time-resolved resonant inelastic x-ray scattering studies

Chemical Effects in Hard X‐ray Photon‐In Photon‐Out Spectra

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