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High-Resolution Core-Level Photoabsorption of Alkali Halides

Published online by Cambridge University Press:  15 February 2011

E. Hudson ,
E. Moler ,
Y. Zheng ,
S. Kellar ,
P. Heimann ,
Z. Hussain  and
D. A. Shirley
E. Hudson
Affiliation:
Chemical Sciences Division, Lawrence Berkeley Laboratory, Berkeley, CA 94720
E. Moler
Affiliation:
Chemical Sciences Division, Lawrence Berkeley Laboratory, Berkeley, CA 94720
Y. Zheng
Affiliation:
Chemical Sciences Division, Lawrence Berkeley Laboratory, Berkeley, CA 94720 Departments of Chemistry and Physics, Pennsylvania State University, University Park PA 16802
S. Kellar
Affiliation:
Chemical Sciences Division, Lawrence Berkeley Laboratory, Berkeley, CA 94720
P. Heimann
Affiliation:
Accelerator and Fusion Research Division, Lawrence Berkeley Laboratory, Berkeley CA 94720
Z. Hussain
Affiliation:
Accelerator and Fusion Research Division, Lawrence Berkeley Laboratory, Berkeley CA 94720
D. A. Shirley
Affiliation:
Departments of Chemistry and Physics, Pennsylvania State University, University Park PA 16802
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Abstract

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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 307: Symposium L – Applications of Synchrotron Radiation Techniques to Materials Science , 1993 , 83
Copyright
Copyright © Materials Research Society 1993

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References

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