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Precise frequency measurement of pure rotational transitions in the vibrationally excited state of molecule

Research Project

Project/Area Number 10640382
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 物理学一般
Research InstitutionToyama University

Principal Investigator

MATSUSHIMA Fusakazu  Toyama University, Department of Physics, Associate Professor, 理学部, 助教授 (40142236)

Co-Investigator(Kenkyū-buntansha) TAKAGI Kojiro  Toyama University, Department of Physics, Professor, 理学部, 教授 (60018976)
ODASHIMA Hitoshi  Toyama University, Department of Physics, Associate Professor, 理学部, 助教授 (50233557)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,900,000)
Fiscal Year 1999: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1998: ¥2,900,000 (Direct Cost: ¥2,900,000)
Keywordsfar-infrared / molecular spectroscopy / rotational spectra / vibrationally excited state / HィイD22ィエD2O / 分子 / 分光学 / レーザー / 水分子
Research Abstract

Frequencies of pure rotational transitions in the vibrationally excited states of molecules have been measured as precise as ordinary microwave spectroscopy. The obtained frequency data are necessary for examining proposed theories of molecules. A tunable far-infrared spectrometer of Toyama university was used in the study. Precision of rotational frequency data was improved by more than two orders of magnitude in the present study.
Firstly, the first excited state of υ2 vibrational mode of HィイD22ィエD2O molecule were investigated. Weak rotational transitions in the vibrationally excited state were successfully observed and measured by our tunable far-infrared spectrometer. Furthermore, a hot sample cell was designed, constructed, and used to observe weaker rotational transitions. Comparing our frequency data with calculated frequencies based on previously reported molecular parameters, it was proved that calculation based on old parameters sometimes brings discrepancies as large as several hundred MHz. A new set of molecular parameters was determined using our data. A high power diode laser system was also desiged and constructed in order to optically pump molecules to highly excited state of vibration.
Secondly, rotational. frequency in the vibrationally ground state of HィイD22ィエD2ィイD117ィエD1O, HィイD22ィエD2ィイD118ィエD1O, DィイD22ィエD2O were measured. Together with frequency data in the vibrationally excited state, these data of isotopomers are necessary for checking the validity of newly proposed molecular theories.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] Hitoshi Odashima: "Tunable Far-Infrared Spectroscopy of ^<82>KrD^+, ^<84>KrD^+, ^<86>KrD^+, and ^<82>KrH^+"Journal of Molecular Spectroscopy. 190. 107-111 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Fusakazu Matsushima: "Rotational Spectra of ^<20>NeH^+, ^<20>NeD^+, ^<22>NeH^+ and ^<22>NeD^+"Journal of Chemical Physics. 109. 2242-2245 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Fusakazu Matsushima: "Frequency Measurement of Pure Rotational Transitions of H_2^<17>O and H_2^<18>O from 0.5 to 5THz"Journal of Molecular Spectroscopy. 193. 217-223 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hitoshi Odashima: "Far-Infrared Rotational Spectrum of ArD^+"Journal of Molecular Spectroscopy. 195. 356-359 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H. Odashima, F. Matsushima, A. Kozato, S. Tsunekawa, K. Takagi, and H. Linnartz: "Tunable Far-Infrared Spectroscopy of ィイD182ィエD1KrDィイD1+ィエD1, ィイD184ィエD1KrDィイD1+ィエD1, ィイD186ィエD1KrDィイD1+ィエD1 and ィイD182ィエD1KrHィイD1+ィエD1"J. Mol. Spectrosc.. 190. 107-111 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] F. Matsushima, Y. Ohtaki, O. Torige, and K. Takagi: "Rotational Spectra of ィイD120ィエD1NeHィイD1+ィエD1, ィイD120ィエD1NeDィイD1+ィエD1, ィイD122ィエD1NeHィイD1+ィエD1 and ィイD122ィエD1NeDィイD1+ィエD1"J Chem. Phys.. 109. 2242-2245 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] F. Matsushima, H. Nagase, T. Nakauchi, H. Odashima and K. Takagi: "Frequency Measurement of Pure Rotational Transitions of HィイD317(/)2ィエD3O and HィイD318(/)2ィエD3O from 0.5 to 5 THz"J. Mol. Spectrosc.. 193. 217-223 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H. Odashima, A. Kozato, F. Matsushima, S. Tsunekawa, and K. Takagi: "Far-Infrares Rotational Spectrum of ArDィイD1+ィエD1"J. Mol. Spectrosc.. 195. 356-359 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Hitoshi Odashima: "Tunable Far-Infrared Spectroscopy of ^<82>KrD^+,^<84>KrD^+,^<86>KrD^+ and ^<82>KrH^+"Journal of Molecular Spectroscopy. 190. 107-111 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] Fusakazu Matsushima: "Rotational Spectra of ^<20>NeH^+,^<20>NeD^+,^<22>NeH^+ and ^<22>NeD^+"Journal of Chemical Physics. 109. 2242-2245 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] Fusakazu Matsushima: "Frequency Measuremest of Pure Rotational Transitions of H_2^<17>O and H_2^<18>O from 0.5 to 5 THz"Journal of Molecular Spectroscopy. 193. 217-223 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Hitoshi Odashima: "Far-Infrared Rotational Spectrum of ArD^+"Journal of Molecular Spectroscopy. 195. 356-359 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Fusakazu Matsushima: "Frequency Measurement of Pure Rotational Transitions of H_2^<17>O and H_2^<18>O from 0.5 to 5THz" Journal of Molecular Spectroscopy. 193巻. 217-223 (1999)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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