XANES and EXAFS studies on K-shell absorption in K1−xNaxCl solid solutions

Murata, Takatoshi; Matsukawa, T.; Naoé, Shun-ichi

doi:10.1016/0038-1098(88)90386-9

Cited by 28 publications

(8 citation statements)

References 7 publications

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“…The Na-Cl distance is 2.61 Å in Fig. 4, which is close to the result of Murata et al 9,10 (2.5 Å), who measured genuine EXAFS spectra using the ultra-high-vacuum soft X-ray beam line at the Institute for Molecular Science. The Na-Cl distance has been reported to be 2.82 Å.…”

Section: Resultssupporting

confidence: 88%

Extended X-ray emission fine structure of sodium†

Kawai¹,

Hayashi²,

Tanuma³

1998

Analyst

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Sodium X-ray emission spectra of NaCl powder were measured by wavelength-dispersive X-ray fluorescence spectrometry and electron probe microanalysis. The X-ray emission spectra show an oscillating fine structure similar to that of the extended X-ray absorption fine structure (EXAFS). The Fourier transform of the X-ray fluorescence spectrum shows a similar radial distribution of atoms around the sodium. These findings demonstrate that a wavelength-dispersive X-ray emission spectrometer is a powerful tool for analyzing the local structure around a light element in condensed matter, which is still not an easy task with using a third-generation synchrotron radiation facility.

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Section: Resultssupporting

confidence: 88%

Extended X-ray emission fine structure of sodium†

Kawai¹,

Hayashi²,

Tanuma³

1998

Analyst

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“…These spectra agree with earlier measurements made over a narrower energy range at room temperature using polycrystalline films [3]. The NaCI spectrum was also measured previously at low temperature [4], with sharp near-edge structure very similar to that shown here. Fig.…”

Section: Resultssupporting

confidence: 81%

High-Resolution Core-Level Photoabsorption of Alkali Halides

et al. 1993

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The X-ray Absorption Near Edge Structure (XANES) of single-crystal alkali halide salts have been measured at low temperature (T≈80 K). By employing the electron partial-yield detection technique, spectra of NaF, NaCI, and NaBr were obtained near the sodium K-edge and spectra of LiF, NaF, and KF were obtained near the fluorine K-edge. All spectra showed sharp features at the absorption threshold and broader absorption features extending 50–80 eV above threshold. The high energy resolution of the soft X-rays (ΔE/E ≈ 4000) allowed the detection of previously unobserved fine structure, particularly in the near-edge region. The narrow features below and just above threshold are attributed to core-level excitons. The intense, broader peaks further above threshold are assigned to single-electron scattering resonances. An ab initio multiple-scattering calculation is used to model the latter effect. Contributions from atomic multielectron excitations, estimated by a comparison to the K-edge photoabsorption spectrum of Ne in the gas phase, are found to be very small.

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“…22,23 Their weak presence in the XAS measurements ͑where they should nominally be absent because of the dipole selection rule͒ is made possible by the symmetry-breaking effects of vibrational disorder. 24 Our q-dependent XRS measurements directly demonstrate that the underlying DOS in the pre-edge region is indeed predominantly dipole forbidden and new real-space full multiple scattering ͑RSFMS͒ and Bethe-Salpeter equation ͑BSE͒ calculations identify the DOS as being overwhelmingly s type. However, the XRS spectra find that this DOS is associated with the higher-energy pre-edge feature in NaCl and most clearly in NaF with little or no signal from the lowerenergy features.…”

Section: Introductionmentioning

confidence: 64%

Final-state symmetry ofNa 1score-shell excitons in NaCl and NaF

Nagle

Seidler

Shirley³

et al. 2009

Phys. Rev. B

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We report measurements of the Na 1s contribution to the nonresonant inelastic x-ray scattering ͑NRIXS͒ from NaCl and NaF. Prior x-ray absorption studies have observed two pre-edge excitons in both materials. The momentum-transfer dependence ͑q dependence͒ of the measured NRIXS cross section and of real-space full multiple scattering and Bethe-Salpeter calculations determine that the higher-energy core excitons are s type for each material. The lower-energy core excitons contribute at most weakly to the NRIXS signal and we propose that these may be surface core excitons, as have been observed in several other alkali halides. The analysis of the orbital angular momentum of these features leads to a discussion of the limited sensitivity of NRIXS measurements to d-type final states when investigating 1s initial states. In this case the s-and p-type final density of states can be characterized by measurements at a small number of momentum transfers. This is in contrast to the case of more complex initial states for which measurements at a large number of momentum transfers are needed to separate the rich admixture of accessible and contributing final-state symmetries.

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XANES and EXAFS studies on K-shell absorption in K1−xNaxCl solid solutions

Cited by 28 publications

References 7 publications

Extended X-ray emission fine structure of sodium†

Extended X-ray emission fine structure of sodium†

High-Resolution Core-Level Photoabsorption of Alkali Halides

Final-state symmetry ofNa 1score-shell excitons in NaCl and NaF

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