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Multi-electron Photoexcitation of Atoms in a Strong DC Electric Field

Research Project

Project/Area Number 14540384
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 物理学一般
Research InstitutionHigh Energy Accelerator Research Organization

Principal Investigator

AZUMA Yoshiro  High Energy Accelerator Research Organization, Institute of Materials Structure Science, Associate Professor (50270393)

Project Period (FY) 2002 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2003: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2002: ¥2,200,000 (Direct Cost: ¥2,200,000)
Keywordssynchrotron radiation / radiative lifetime / many electron effects / photoexcitation / metastable atom / 多電子光励起 / 強電場 / シュタルク効果 / 電子相関 / 原子分光
Research Abstract

Two major results were achieved during the duration of research. These include,
(1) Photoion measurements of helium two electron photoexcitation in a strong electric field.
(2) The achievement of "Lifetime Resolved Fluorescence Spectroscopy"
The former (1) concerns multielectron photoexcitation of atoms in a strong static electric field. The project has opened virgin territory for new research on atomic structure and dynamics in a situation where the effect of electron correlation is comparable to that of the external electric field. As a matter of fact parallel developments in theory has been quick to come by, including the work on propensity rules of perturbations (Tong & Lin, Phys. Rev. Lett. 92, 223003, 2004). The implicati9ns to solid state physics, such as the behaviour of quasi-free electrons in electric fields also merit further exploration. An apparatus capable of imposing an electric field exceeding 100kV/cm has been constructed, tested at the Photon Factory, and the final measu … More rements were made at the Advanced Light Source at Berkeley, taking advantage of the high resolution and high flux available at third generation synchrotron light sources.
The latter (2) result came as a new development. The strong field apparatus was originally designed only to accommodate photoion detection. Nevertheless, based mainly on the initiative of our postdoctoral fellow James Harries, implementations were made to accomplishi the detection of fluorescence and metastable atoms. This employs single-bunch operation of the synchrotron ring and makes use of the time structure of the signals to to separately detect fluorescence and meta-stable species. It was found particularly useful that the accurate determination of radiative lifetime became possible. This enabled the measurement of the two dimensional spectrum of excitation energy versus radiative lifetime "profile". The few to several lifetimes corresponding to different final ionic states can be analyzed from the 2D spectrum. This amounts to achieving the measurement of photon energy scan spectrum with constant final ionic state (Lifetime Resolved Fluorescence Spectroscopy). It is our claim that this is the third new method, with new merits and demerits in comparison to constant ionic state (CIS) electron spectroscopy, or energy analysis of fluorescence. Less

Report

(3 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • Research Products

    (10 results)

All 2004 2003 Other

All Journal Article (6 results) Publications (4 results)

  • [Journal Article] Experimental determination of the lifetimes of the 2pnd doubly excited states of helium by the detection of VUV fluorescence2004

    • Author(s)
      Y.Azuma, et al.
    • Journal Title

      Journal of Physics B 37

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Experimental determination of the lifetimes of the 2pnd doubly excited states of helium by the detection of VUV fluorescence2004

    • Author(s)
      James R.Harries, James P.Sullivan, Yoshiro Azuma
    • Journal Title

      J.Phys. B37

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Double Photoeacitation of Helium in a Strong dc Electric Field2003

    • Author(s)
      Y.Azuma, et al.
    • Journal Title

      Physical Review Letters 90

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Doubly excited states of helium observed in N- and 1- specific partial photoionization cross-sections using lifetime-resolved fluorescence spectroscopy2003

    • Author(s)
      Y.Azuma, et al.
    • Journal Title

      Journal of Physics B 36

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Doubly excited states of helium observed in N- and L-specific partial photoionization cross-sections using lifetime-resolved fluorescence spectroscopy2003

    • Author(s)
      James R.Harries, James P.Sullivan, Satoshi Obara, Peter Hammond, Yoshiro Azuma
    • Journal Title

      J.Phys. B36(19)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Double Photoexcitation of Helium in a Strong dc Electric Field2003

    • Author(s)
      James R.Harries, James P.Sullivan, James B.Sternberg, Satoshi Obara, Tadayuki Suzuki, Peter Hammond, John Bozek, Nora Berrah, Monica Halka, Yoshiro Azuma
    • Journal Title

      Phys.Rev.Lett. 90(13)

      Pages: 133002-133002

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] J.R.Harries, Y.Azuma, その他: "Double Photoexcitation of Helium in a Strong dc Electric Field"Physical Review Letters. 90, 13. 133002 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] J.R.Harries, Y.Azuma, その他: "Doubly excited states of helium observed in N- and I-specific partial Photoionization cross-sections using lifetime-resolved fluorescence"Journal of Physics B. 36. L319-L326 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] J.R.Harries, Y.Azuma, その他: "Experimental determination of the lifetimes of the doubly excited states of helium by detection of VUV fluorescence"Journal of Physics B. L169-L173 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Yoshiro Azuma et al.: "Double Photoexcitation of Helium in a Strong dc Electric Field"Physical Review Letters. 90 13. 133002-1-133002-4 (2003)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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