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Excitonic Effects in X-Ray Transitions in Metals.

¹Institute of Theoretical Science and Department of Physics, University of Oregon, Eugene, Oregon 94703 and General Electric Research and Development Center, Schenectady, New York 12301.

Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry

|June 12, 2020

Summary

This summary is machine-generated.

Soft x-ray transitions in solids do not directly measure the density of states due to matrix element variations and final state interactions. Calculations show these effects significantly impact results.

Keywords:

Density of states exciton many body effects phase shifts soft x-ray transition probability

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Published on: April 17, 2018

Area of Science:

Solid-state physics
Atomic and molecular physics

Background:

Soft x-ray spectroscopy is used to study electronic structures in solids.
Traditionally, it was hoped that results directly reflect the density of states.
This relied on assumptions of small matrix element variations and negligible final state interactions.

Purpose of the Study:

To investigate the validity of using soft x-ray transitions as a direct measure of the density of states in solids.
To illustrate the impact of matrix element variations and final state interactions on spectroscopic results.

Main Methods:

Calculated the one-electron oscillator strength of a body-centered cubic (bcc) metal as a function of energy.
Estimated the strength of the Nozieres-DeDominicis singularity at the spectral threshold.
Utilized an assumed Yukawa interaction between conduction electrons and core holes to determine phase shifts.

Main Results:

Demonstrated that matrix element variations across the band are significant.
Showed that final state interactions, particularly the Nozieres-DeDominicis singularity, strongly influence spectral features.
Quantified the deviation from a direct density of states measure.

Conclusions:

The assumptions that matrix element variations and final state interactions are negligible in soft x-ray transitions are incorrect.
These effects significantly alter the interpretation of soft x-ray spectra, moving away from a direct density of states measure.
Accurate interpretation requires accounting for these electron correlation and matrix element effects.