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Confined helium, density dependence of the inelastic electron and photon scattering cross-sections and the optical oscillator strength.

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Title: Confined helium, density dependence of the inelastic electron and photon scattering cross-sections and the optical oscillator strength.
Authors: Pyper, N. C.1 (AUTHOR), Whelan, Colm T.2 (AUTHOR) cwhelan@odu.edu
Source: Proceedings of the Royal Society A: Mathematical, Physical & Engineering Sciences. Jun2022, Vol. 478 Issue 2262, p1-17. 17p.
Subjects: Photon scattering, Oscillator strengths, Electron scattering, Light scattering, Electronic excitation, Inelastic scattering, Bubbles
Abstract: The electron and photon excitation of confined and compressed atoms is discussed. It is shown that the optical oscillator strength, the inelastic X-ray and electron impact cross-sections are all density-dependent. Ab-initio electronic structure calculations are presented for the 1s2→1s2p(1P) transition in helium, which predict that the amplitudes for the inelastic scattering of electrons, optical absorption and the excitation energy are all significantly increased in bulk condensed phases of pure helium compared to those of an isolated atom. The enhancements increase with atomic density but are very similar for bcc and fcc structured bulk phases of the same density. These enhancements need to be incorporated into the analysis of scanning transmission electron microscope studies of helium nano bubbles embedded in different materials. The excitation energy and cross-section enhancements with increasing density arise from the contraction of the 2p orbital on entering a condensed phase. For the bulk phases, but not the bubbles, the close agreement between the experimental and computed values of the energy shifts can be well described by a simple relationship. [ABSTRACT FROM AUTHOR]
Copyright of Proceedings of the Royal Society A: Mathematical, Physical & Engineering Sciences is the property of Royal Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
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PubTypeId: academicJournal
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  Data: Confined helium, density dependence of the inelastic electron and photon scattering cross-sections and the optical oscillator strength.
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  Data: <searchLink fieldCode="AR" term="%22Pyper%2C+N%2E+C%2E%22">Pyper, N. C.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Whelan%2C+Colm+T%2E%22">Whelan, Colm T.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> cwhelan@odu.edu</i>
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  Data: <searchLink fieldCode="DE" term="%22Photon+scattering%22">Photon scattering</searchLink><br /><searchLink fieldCode="DE" term="%22Oscillator+strengths%22">Oscillator strengths</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+scattering%22">Electron scattering</searchLink><br /><searchLink fieldCode="DE" term="%22Light+scattering%22">Light scattering</searchLink><br /><searchLink fieldCode="DE" term="%22Electronic+excitation%22">Electronic excitation</searchLink><br /><searchLink fieldCode="DE" term="%22Inelastic+scattering%22">Inelastic scattering</searchLink><br /><searchLink fieldCode="DE" term="%22Bubbles%22">Bubbles</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The electron and photon excitation of confined and compressed atoms is discussed. It is shown that the optical oscillator strength, the inelastic X-ray and electron impact cross-sections are all density-dependent. Ab-initio electronic structure calculations are presented for the 1s2→1s2p(1P) transition in helium, which predict that the amplitudes for the inelastic scattering of electrons, optical absorption and the excitation energy are all significantly increased in bulk condensed phases of pure helium compared to those of an isolated atom. The enhancements increase with atomic density but are very similar for bcc and fcc structured bulk phases of the same density. These enhancements need to be incorporated into the analysis of scanning transmission electron microscope studies of helium nano bubbles embedded in different materials. The excitation energy and cross-section enhancements with increasing density arise from the contraction of the 2p orbital on entering a condensed phase. For the bulk phases, but not the bubbles, the close agreement between the experimental and computed values of the energy shifts can be well described by a simple relationship. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Proceedings of the Royal Society A: Mathematical, Physical & Engineering Sciences is the property of Royal Society and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1098/rspa.2022.0036
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 17
        StartPage: 1
    Subjects:
      – SubjectFull: Photon scattering
        Type: general
      – SubjectFull: Oscillator strengths
        Type: general
      – SubjectFull: Electron scattering
        Type: general
      – SubjectFull: Light scattering
        Type: general
      – SubjectFull: Electronic excitation
        Type: general
      – SubjectFull: Inelastic scattering
        Type: general
      – SubjectFull: Bubbles
        Type: general
    Titles:
      – TitleFull: Confined helium, density dependence of the inelastic electron and photon scattering cross-sections and the optical oscillator strength.
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            NameFull: Pyper, N. C.
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            NameFull: Whelan, Colm T.
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            – D: 01
              M: 06
              Text: Jun2022
              Type: published
              Y: 2022
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              Value: 478
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            – TitleFull: Proceedings of the Royal Society A: Mathematical, Physical & Engineering Sciences
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