A quantum mechanical exploration of phonon energy-loss spectroscopy using electrons in the aloof beam geometry

L J Allen, H G Brown, S D Findlay, B D Forbes

Research output: Contribution to journalArticleResearchpeer-review

2 Citations (Scopus)

Abstract

Phonon energy-loss spectroscopy using electrons has both high resolution and low resolution components, associated with short- and long-range interactions, respectively. In this paper, we discuss how these two contributions arise from a fundamental quantum mechanical perspective. Starting from a correlated model for the atomic motion we show how short range 'impact' scattering and long range 'dipole' scattering arises. The latter dominates in aloof beam imaging, an imaging geometry in which radiation damage can be avoided.

Original languageEnglish
Pages (from-to)i24-i29
Number of pages6
JournalMicroscopy
Volume67
Issue numberS1
DOIs
Publication statusPublished - 1 Mar 2018

Keywords

  • Aloof beam geometry
  • Electron energy-loss spectroscopy
  • Phonon excitation

Cite this

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A quantum mechanical exploration of phonon energy-loss spectroscopy using electrons in the aloof beam geometry. / Allen, L J; Brown, H G; Findlay, S D; Forbes, B D.

In: Microscopy, Vol. 67, No. S1, 01.03.2018, p. i24-i29.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Brown, H G

AU - Findlay, S D

AU - Forbes, B D

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N2 - Phonon energy-loss spectroscopy using electrons has both high resolution and low resolution components, associated with short- and long-range interactions, respectively. In this paper, we discuss how these two contributions arise from a fundamental quantum mechanical perspective. Starting from a correlated model for the atomic motion we show how short range 'impact' scattering and long range 'dipole' scattering arises. The latter dominates in aloof beam imaging, an imaging geometry in which radiation damage can be avoided.

AB - Phonon energy-loss spectroscopy using electrons has both high resolution and low resolution components, associated with short- and long-range interactions, respectively. In this paper, we discuss how these two contributions arise from a fundamental quantum mechanical perspective. Starting from a correlated model for the atomic motion we show how short range 'impact' scattering and long range 'dipole' scattering arises. The latter dominates in aloof beam imaging, an imaging geometry in which radiation damage can be avoided.

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KW - Phonon excitation

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