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Electronic wavefunction-selective light-dressing effect in laser-assisted elastic impact ionization

Research Project

Project/Area Number 19K15498
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 32010:Fundamental physical chemistry-related
Research InstitutionNational Institute for Materials Science (2020-2021)
The University of Tokyo (2019)

Principal Investigator

HIROI Takashi  国立研究開発法人物質・材料研究機構, 若手国際研究センター, ICYS研究員 (20754964)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords電子衝撃イオン化 / 電子状態 / 強光子場科学 / 光ドレスト効果 / 電子軌道 / コインシデンス計測
Outline of Research at the Start

本研究課題では、電子雲の変形という観点で捉えられてきた光ドレスト効果の研究をさらに進め、強い光によって引き起こされる様々な現象の初期過程の理解を深めるために重要な、電子雲を構成する各電子軌道についての光ドレスト効果を観測し、その効果を定量的に明らかにすることを目的とする。そのために、既報の装置と比較して桁違いに高い捕集効率・エネルギー分解能を持つ装置を自作し、得られた微分散乱断面積を再現できる理論の定式化及び計算を行う。

Outline of Final Research Achievements

In this study, in order to observe the light-dressing effect on electronic wavefunctions, we developed an apparatus consisting of two sets of angle-resolved time-of-flight analyzers to observe electron impact ionization occurring in a laser field, known as laser-assisted electron impact ionization (LA(e, 2e)). Using the developed apparatus, LA(e, 2e) process of Ar with one-photon energy absorption has been observed. The signal intensity of the observed LA(e,2e) process was about twice as large as that estimated by the theoretical calculations in which the interaction between a target Ar and the light field is neglected. We ascribed this discrepancy to the mixing of the electronic ground state of Ar with the electronically excited states through the formation of the light-dressed states.

Academic Significance and Societal Importance of the Research Achievements

本研究によって、電子密度分布の歪みとして捉えられてきた光ドレスト状態を、電子密度分布を構成する個々の電子波動関数の歪みとして実験的に観測できることが示された。電子衝撃イオン化は原子や分子の電子波動関数を実験的に観測する手法としても知られているため、本手法を用いることによって、高強度レーザー場中における原子や分子の波動関数の観測が可能になると考えられる。さらに発展させ、強光子場中における分子や光誘起化学反応中の系の複数の電子波動関数を決定することによって、イオン化や化学反応の高精度な設計・制御につながると期待される。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (10 results)

All 2022 2021 2020 2019

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (8 results) (of which Int'l Joint Research: 5 results,  Invited: 2 results) Book (1 results)

  • [Journal Article] Observation of laser-assisted electron-impact ionization in ultrashort intense laser fields2021

    • Author(s)
      Takashi Hiroi, Yuya Morimoto, Reika Kanya, Kaoru Yamanouchi
    • Journal Title

      Physical Review A

      Volume: 104 Issue: 6

    • DOI

      10.1103/physreva.104.062812

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Presentation] Observation of laser-assisted (e, 2e) process of Ar in intense laser fields2021

    • Author(s)
      Takashi Hiroi, Yuya Morimoto, Reika Kanya, Kaoru Yamanouchi
    • Organizer
      (virtual) International Symposium on Correlation, Polarization and Ionization in Atomic and Molecular Collisions
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Observation of laser-assisted (e, 2e) process of Ar in ultrashort intense laser fields2021

    • Author(s)
      Takashi Hiroi, Yuya Morimoto, Reika Kanya, Kaoru Yamanouchi
    • Organizer
      第15回分子科学討論会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Observation of laser-assisted (e,2e) of Ar in ultrashort intense laser fields2021

    • Author(s)
      Takashi Hiroi, Yuya Morimoto, Reika Kanya, Kaoru Yamanouchi
    • Organizer
      Pacifichem2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Observation of Laser-Assisted (e,2e) in Ultrashort Intense Laser Fields2020

    • Author(s)
      Takashi Hiroi, Yuya Morimoto, Reika Kanya, Kaoru Yamanouchi
    • Organizer
      The 22nd International Conference on Ultrafast Phenomena
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Electron impact excitation spectroscopy of highly excited H2 molecule2019

    • Author(s)
      Takashi Hiroi, Yuya Morimoto, Reika Kanya, Kaoru Yamanouchi
    • Organizer
      The 10th Shanghai-Tokyo Advanced Research Symposium on Ultrafast Intense Laser Science (STAR10)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Electron impact excitation spectroscopy of excited H2 molecule2019

    • Author(s)
      Takashi Hiroi, Yuya Morimoto, Reika Kanya, Kaoru Yamanouchi
    • Organizer
      第35回化学反応討論会
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Electron impact excitation spectroscopy of electronically excited H22019

    • Author(s)
      Takashi Hiroi, Yuya Morimoto, Reika Kanya, Kaoru Yamanouchi
    • Organizer
      第16回AMO討論会
    • Related Report
      2019 Research-status Report
  • [Presentation] Electron impact excitation spectroscopy of electronically excited H22019

    • Author(s)
      Takashi Hiroi, Yuya Morimoto, Reika Kanya, Kaoru Yamanouchi
    • Organizer
      第13回分子科学討論会
    • Related Report
      2019 Research-status Report
  • [Book] 強光子場分子科学2022

    • Author(s)
      山内 薫
    • Total Pages
      472
    • Publisher
      朝倉書店
    • ISBN
      9784254141085
    • Related Report
      2021 Annual Research Report

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Published: 2019-04-18   Modified: 2023-01-30  

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