High-resolution Spectroscopy of mass-selected Yb2 molecules produced by photoassociation of laser-cooled atoms

• Project/Area Number: 16K05654
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Physical chemistry
• Research Institution: Kyoto University
• Principal Investigator: Baba Masaaki 京都大学, 理学研究科, 教授 (80189729)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000); Fiscal Year 2018: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000); Fiscal Year 2017: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000); Fiscal Year 2016: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
• Keywords: イッテルビウム分子 / 光会合 / 質量同位体選別 / 高分解能スペクトル / レーザー冷却原子 / Ｙｂ２分子 / MOT / Yb2分子 / ポテンシャルエネルギー曲線 / 高分解能レーザー分光 / 冷却原子トラップ / 冷却原子光会合 / ポテンシャル決定

Outline of Final Research Achievements

The purpose og this study is to obtain a high-resolution spectrum of mass-selected Yb2 produced by photoassciation of laser-cooled atoms trapped in a magneto-optical trap (MOT). We develope the apparatus of not only a MOT with laser photoassociation, but also a moelcuar beam with a pulsed tunable laser. We could observe the high-resolution electronic spectrum and the experimental results on bonding energy and heavy-stom effect were compared with ab initio theoretical calculation. We desire to continue this work to completely elucidate the chemical bond by introducing mass-scaling law on the basis of the accurate molecular constants.

Academic Significance and Societal Importance of the Research Achievements

Yb2のような重原子の分子では，通常の分子では顕著ではない相互作用が重要になると予想されるが，これまで実験的な困難から，その高分解能スペクトルの測定結果はなかった．本研究は，電子遷移の高分解能スペクトルを測定してその解明の糸口を見つけたことで，化学結合解明への貢献は大きく，基礎学術的な意義は大きい．また，重原子の化合物は，ＩＴ機器を支える新規物質として重要であり，その基本的な知見を得たことで，社会的にも大きな意義を持っており，この研究の今後の展開が期待される．

Research Products

• [Presentation] 高精度高分解能レーザー分子分光 (2018)
  • Author(s): 馬場正昭，御園雅俊，榎本勝成
  • Organizer: 第１８回分子分光研究会
• [Presentation] 高精度高分解能レーザー分光による分子の構造と励起状態ダイナミクス (2018)
  • Author(s): 馬場正昭
  • Organizer: 分子科学討論会２０１８
  • Invited
• [Presentation] Supersonic-jet laser spectroscopy of nonplanar aromatic hydrocarbon (2018)
  • Author(s): 金岡歩美
  • Organizer: 2nd Asian Workshop n Molecular Spectroscopy
  • Int'l Joint Research
• [Presentation] Ultrahigh-Resolution Spectroscopy of PAHs (2018)
  • Author(s): 馬場正昭
  • Organizer: 2nd Asian Workshop n Molecular Spectroscopy
  • Int'l Joint Research
• [Presentation] 高精度高分解能レーザー分子分光 (2018)
  • Author(s): 馬場正昭
  • Organizer: 分子分光研究会
• [Presentation] High-resolution Spectroscopy of Deuterated Benzenes (2017)
  • Author(s): 国重沙知
  • Organizer: 1st Asian Workshop n Molecular Spectroscopy
  • Int'l Joint Research