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Multiple photon excitation and selective reactions of hydrocarbons doped in low temperature crystals

Research Project

Project/Area Number 07455312
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 反応・分離工学
Research InstitutionUniversity of Tokyo

Principal Investigator

KODA Seiichiro  University of Tokyo・Graduate School of Engineering・Professor, 大学院・工学系研究科, 教授 (10011107)

Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥7,600,000 (Direct Cost: ¥7,600,000)
Fiscal Year 1996: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1995: ¥6,000,000 (Direct Cost: ¥6,000,000)
Keywordslow temperature rare-gas crystal / free standing crystal / oxygen / infrared multiple photon absorption / cage effect / hydrogen sulfide / chlorofluorohydrocarbons / ケージ効果 / ジフロロクロロメタン / 低温結晶 / レーザー励起 / 選択的反応 / 同位体分離 / 振動緩和 / 硫化カルボニル
Research Abstract

1. The isolated molecules in low temperature crystals are expected to possess sharp absorption lines due to the decrease of the contribution of the phonon side bands, and thus selective excitation of the molecules may be easy. The vibrational relaxation is expected to be relatively slow in low temperature solids. The objective of the present research is to isolate small polyatomic molecules in low temperature rare-gas crystals and to pursue the photophysical behavior of the isolated molecules.
2. The case of oxygen molecules was studied in detail. When the oxygen molecules were isolated in Ar or Kr crystals and irradiated by KrF laser light, absorption lines assigned to the transition from the highly vibrationally excited ground electronic state to a higher electronic state were newly found. Analysis of these line positions and time behaviors gave the potential curve of the upper B electronic state, and also the mechanism and rates of the very slow relaxation of the vibrational states.
In the case of hydrogen sulfide and some chlorofluorohydrocarbons, the isolation was only possible when they were diluted to less than 1/10000. These isolated molecules could be dissociated by KrF excimer laser irradiation, but not by infrared TEA carbon dioxide laser irradiation. The latter may be due to the relatively fast vibrational relaxation in the intermediate stages and/or energy mismatch during the infrared multiple photon absorption.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] Kajihara H.(梶原秀夫): "UV absorption spectra of vibrationally excited O_2 and its accumulation under KrFexcimer laser irradiation in a low-temperature Ar crystal" Chem. Phys. Lett.256. 126-132 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Kajihara H.(梶原秀夫): "Vibrational numbering and potential curves of O_2(B_3ΣB_u~) doped in low-temperature Ar and Kr crystals" J.Molecular spectroscopy. 183. 72-80 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Kajihara H.: "UV absorption spectra of vibrationally excited O_2 and its accumulation under KrF excimer laser irradation in a low-temperature Ar crystal" Chem.Phys.Lett.256. 126-132 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Kajihara H.: "Vibrational numbering and potential curves of O_2 (B^3 SIGMA_u^-) doped in low-temperature Ar and Kr crystals" J.Molecular Spectroscopy. 183. 72-80 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Kajihara H.(梶原秀夫): "UV absorption spectra of vibrationally excited O_2 and its accumulation under KrFexcimer laser irradiation in a low-temperature Ar crystal" Chem.Phys.Lett.256. 126-132 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Kajihara H.(梶原秀夫): "Vibrational numbering and potential curves of O_2(B^3Σ_u^-)doped in low-temperature Ar and Kr crystals" J.Molecular Spectroscopy. (in press). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 梶原秀夫: "低温希ガス結晶中にドープしたO_2の振動励起状態の吸収スペクトルと振動緩和" 日本化学会第70春季年会講演予稿集. (印刷中). (1996)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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