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Study of Collision Process of Ultracold Ions by Means of Quantum Jump Signals

Research Project

Project/Area Number 04452054
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 物理学一般
Research InstitutionThe University of Tokyo

Principal Investigator

TACHIKAWA Maki  The University of Tokyo Graduate School of Science Research Assistant, 大学院・理学系研究科, 助手 (60201612)

Co-Investigator(Kenkyū-buntansha) SHIMIZU Tadao  The University of Tokyo Graduate School of Science Professor, 大学院・理学系研究科, 教授 (90011668)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥7,100,000 (Direct Cost: ¥7,100,000)
Fiscal Year 1993: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1992: ¥5,400,000 (Direct Cost: ¥5,400,000)
KeywordsIon Trap / Laser Cooling / Ion Collision / Quantum Jump / RF加熱
Research Abstract

The present research has been carried out in order to clarify characteristics of collision processes of cold ions with atoms and molecules by means of the laser-induced-fluorescence (LIF) spectroscopy and the laser-cooling technique. Major outcomes are described below.
1. Collision Cooling of Trapped Ions
Mg^+ ions confined in a rf trap were cooled via elastic collisions with buffer gas at room temperature. We investigated dependences of the ion temperature, which was measured from the Doppler broadening of the LIF spectrum, on the mass and the pressure of the buffer gas. A theoretical model describing the rf heating induced by the collision with the buffer gas was successfully applied to reproduce the observed results.
2. Laser Cooling of Trapped Ions
The LIF spectrum from several tens of laser-cooled ions was observed. The spectrum has a narrow and asymmetric profile because of the effects of the laser cooling in the red-shifted region and the laser heating in the blue-shifted region. The analysis based on our model revealed that the cooling limit was several K.and that the ions were little heated by the collisions with neutral atoms under strong laser radiation.
3. Observation of Ion Cluster
A few ions were laser-cooled down to 10 mK, and localized on the equilibrium points of the Coulomb potential, forming a cluster. We observed two-dimensional images of the fluorescence from the clusters consisting of up to three ions. The fluorescence images enabled a real-time observation of breakdown of the cluster caused by the collision with residual gas.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] Y.Moriwaki: "Collision Cooling of Ions Stored in Quadrupole Radio-Frequency Trap" Jpn.J.Appl.Phys.31. L1640-L1643 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] M.Tachikawa: "Dynamic Properties of Ions Stored and Laser-Cooled in a Linear Trap" IEEE Trans.Instrum.Meas.42. 281-286 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Y.Moriwaki: "Laser Spectroscopic Study of Dynamics of Laser-Cooled Ions in Paul Trap" AIP Proc.of Int.Conference on Laser Spectroscopy XI. 290. 38 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 立川真樹: "「極限光技術」(「イオントラップ」の章)" オプトロニクス社, 7p (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Y.Moriwaki et al.: "Collision Cooling of Ions Stored in Quadrupole Radio-Frequency Trap" Jpn.J.Appl.Phys.31. L1640-L1643 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] M.Tachikawa et al.: "Dynamic Properties of Ions Stored and Laser-Cooled in a Linear Trap" IEEE Trans.Instrum.Meas.42. 281-286 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Y.Moriwaki et al.: "Laser Spectroscopic Study of Dynamics of Laser-Cooled Ions in Paul Trap" AIP Proc.of Int.Conference on Laser Spectroscopy XI. 290. 38- (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] M.Tachikawa: "Ion Trap" Kyokugenhikarigijyutu, Optronics. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Y.Moriwaki: "Laser Spectroscopic Study of Dynamics of Laser Cooled Ion in Paul Trap" Laser Spectroscopy XI.International Conference AIP Conference Proceedings. 290. 38 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Y.Moriwaki: "Collision Cooling of Ions Stored in Quadrupole Radio-Frequency Trap" Jpn.J.Appl.Phys.31. L1640-L1643 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] M.Tachikawa: "Dynamic Properties of Ions Stored and Laser-Cooled in Linear Trap" IEEE Trans.Instrum.Meas.

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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