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Submillimeter-Wave(400-700 GHz) Sources and Spectroscopy of the H_2D^+Ion

Research Project

Project/Area Number 62470015
Research Category

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

Allocation TypeSingle-year Grants
Research Field 構造化学
Research InstitutionNagoya University

Principal Investigator

SAITO Shuji  Nagoya University, Faculty of Science, Professor, 理学部, 教授 (30106158)

Co-Investigator(Kenkyū-buntansha) YAMAMOTO Satoshi  Nagoya Univ., Faculty of Science, Research Asso., 理学部, 助手 (80182624)
Project Period (FY) 1987 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥6,700,000 (Direct Cost: ¥6,700,000)
Fiscal Year 1989: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1988: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1987: ¥3,000,000 (Direct Cost: ¥3,000,000)
KeywordsMicrowave spectroscopy / Transient molecule / Interstellar molecule / Free radical / Radio telescope / Unidentified interstellar line / Millimeter-wave Spectroscopy / Submillimeter-wave spectroscopy / フリーラジカル / 電波望遠鏡星間分子 / 星間化学 / ミリ波 / 分子イオン
Research Abstract

We constructed doublers and triplers from a combination of millimeter wave klystrons and nonlinear mixers (GaAs Schottky diode), aiming to obtain the radiation power at 400-700 GHz suitable for spectroscopy of the submillimeter-wave transitions of the H_2D^+ion. However, the output power generated from the tripler constructed was too low in power to carry out spectroscopy in the submillimeter-wave region. We have tried to improve the tripler to give a higher output power. A quadrupler giving the output power in the frequency region above 400 GHz is planned in the coming year.
We have studied several transient molecules, especially potential candidates for interstellar molecules by using the high-sensitivity millimeter and submillimeter-wave spectrometer combined with the multipliers developed in the Research Project.. We identified four new interstellar molecules, CH_2CN(^2B_1), cyclic-C_3H(^2B_2), CP(^2SIGMA^+), and C_4Si, mainly on the basis of the laboratory spectroscopic results. We also studied several new molecules such as PS(2PI_r), MgS, CaS, AlS(^2SIGMA^+). FeS(^5DELTA_i), NH_2O(^2B_1), ND_2(^2B_2), and HSiS(^2A'), and determined their detailed molecular constants with high precision.

Report

(4 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • 1987 Annual Research Report
  • Research Products

    (28 results)

All Other

All Publications (28 results)

  • [Publications] S.Saito: "Laboratory Microwave Spectroscopy of Interstellar Molecules" Appl.Spectrosc.Rev.26. (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] M.Ohishi: "Detection of a New Circumstellar Carbon Chain Molecule,C_4Si" Astrophys.J.345. L83-L86 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] S.Saito: "The Microwave Spectrum of the CP Radical and Related Astronomical Search" Astrophys.J.341. 1114-1119 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] W.M.Irvine: "Identification of the Interstellar Cyanomethyl Radical(CH_2CN)in the Molecular Clouds TMC-1 and Sagittarius B2" Astrophys.J.334. L107-L111 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] S.Saito: "Laboratory Detection of a New Interstellar Free Radical CH_2CN(^2B_1)" Astrolphys.J.334. L113-L116 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] S.Saito: "The Microwave Spectrum of the H_2Cl^+ Ion" J.Chem.Phys.88. 2281-2283 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] S. Saito: "Laboratory Microwave Spectroscopy of Interstellar Molecules" Appl. Spectrosc. Rev., (1990).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] M. Ohishi et al.: "Detection of a New Circumstellar Carbon Chain Molecle, C_4Si" Astrophys. J., 345, L83-L86 (1990).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] S. Saito et al.: "The Microwave Spectrum of the CP Radical and Related Astronomical Search" Astrophys. J., 341, 1114-1119 (1989).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] W. M. Irvine et al.: "Identification of the Interstellar Cyanomethyl Radical (CH_2CN) in the Molecular Clouds TMC-1 and Sagittarius B2" Astrophys. J., 334, L107-L111 (1988).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] S. Saito et al.: "Laboratory Detection of a New Interstellar Free Radical CH_2CN(^2B_1)" Astrophys. J., 334, L113-L116 (1988).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] S. Saito et al.: "The Microwave Spectrum of the H_2Cl^+ Ion" J. Chem. Phys., 88, 2281-2283 (1988).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] S.Saito: "Laboratory Microwave Spectroscopy of Interstellar Molecules" Appl.Spectrosc.Rev.26. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] S.Yamamoto: "Laboratory Microwave Spectroscopy of the Linear C_3H and C_3D Radicals and Related Astronomical Observation" S.Yamamoto. 348. 363-369 (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] M.Ohishi: "Detection of a New Circumstellar Carbon Chain Molecule,C_4Si" Astrophys.J.345. L83-L86 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] S.Takano: "Millimetr Wave Spectra of MgS and CaS" Chem.Phys.Letters. 159. 563-566 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] S.Saito: "The Microwave Spectrum of the CP Radical and Related Astronomical Search" Astrophys.J.341. 1114-1119 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] H.Mikami: "Laboratory Microwave Spectroscopy of the C_3N Radical in the Vibrationally Excited State ν_5" Astron.Astrophys.217. L5-L8 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] S.Saito: Astrophys.J.334. L113-L116 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] W.M.Irvine: Astrophys.J.334. L107-L111 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] S.Saito: Astrophys.J.341. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] H.Kanata: J.Mol.Spectrosc.131. 89-95 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] S.Yamamoto: Astrophysical Journal. 322. L55-L58 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] S.Saito: Journal of Chemical Physics. 88. (1988)

    • Related Report
      1987 Annual Research Report
  • [Publications] S.Yamamoto: Astrophysical Journal. 323. L149-L153 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] M.Ohishi: Astrophysical Journal. (1988)

    • Related Report
      1987 Annual Research Report
  • [Publications] S.Yamamoto: Journal Chemical Physics. (1988)

    • Related Report
      1987 Annual Research Report
  • [Publications] S.Saito: Astrophysical Journal. (1988)

    • Related Report
      1987 Annual Research Report

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Published: 1987-04-01   Modified: 2016-04-21  

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