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Simple model for ph...
Simple model for phonon spectroscopy using fast electrons
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- Barthel, Juri (författare)
- Forschungszentrum Juelich, Ernst Ruska Ctr ER C 2, D-52425 Julich, Germany.
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- Zeiger, Paul, 1994- (författare)
- Uppsala universitet,Materialteori
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- Rusz, Jan, 1979- (författare)
- Uppsala universitet,Materialteori,Teoretisk fysik
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- Allen, Leslie J. (författare)
- Univ Melbourne, Sch Phys, Parkville, Vic 3010, Australia.
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Forschungszentrum Juelich, Ernst Ruska Ctr ER C 2, D-52425 Julich, Germany Materialteori (creator_code:org_t)
- American Physical Society, 2024
- 2024
- Engelska.
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Ingår i: Physical Review B. - : American Physical Society. - 2469-9950 .- 2469-9969. ; 109:18
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We propose a simple approach to simulating the phonon sector in electron energy-loss spectroscopy (EELS), as implemented in scanning transmission electron microscopy. Simplification of the problem is obtained by working with the phonon density of states (PDOS), a function of phonon energy, which is an integral over the details of the dispersion relations due to the correlated motions of the atoms. For a given PDOS, we derive a spectral distribution function, to distribute the total inelastic scattering, as calculated within the quantum excitation of phonons model, into an energy-loss/gain spectrum. The spectral distribution is obtained assuming a linear relationship between inelastic phonon scattering and atomic mean-squared displacements, a good approximation for phonon EELS with a detector covering only moderate scattering angles. We provide examples of the usefulness of the proposed approach in the modeling and interpretation of experimental phonon EELS data.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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