Investigation of unknown quantum states by using a wideband passive spectroscopy at terahertz frequency region

• Project/Area Number: 20550022
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Physical chemistry
• Research Institution: Toho University
• Principal Investigator: OZEKI Hiroyuki Toho University, 理学部, 教授 (70260031)
• Co-Investigator(Kenkyū-buntansha): KOBAYASHI Kaori 富山大学, 理工学研究部, 准教授 (80397166) ; KOHJIRO Satoshi 産業技術総合研究所, エレクトロニクス研究部門, 超伝導計測デバイスグループ長 (60356962)
• Project Period (FY): 2008 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2010: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2009: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2008: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: 絶対強度 / テラヘルツ / 受動分光 / 圧力幅測定 / ギ酸メチル / 振動励起状態 / 分配関数 / 亜酸化窒素

Research Abstract

We have applied a laboratory passive spectroscopy at terahertz frequency region to the molecule whose precise energy level structure is hard to obtain. We chose methyl formate for the present study. The molecule is known to have low energy torsional modes and to give complex spectral features. The spectral assignment is underway and plenty of unassigned spectral lines are observed. We measured absolute spectral intensity of the selected lines of the molecule in the ground states at given temperature and pressure. We estimated an "effective partition function" of the molecule at our observed temperature with this result, and found that the value is consistent with the calculated energy structure derived by a high-level ab initio calculation. The present information will help us to obtain an abundance of the methyl formate in interstellar space by astronomical observation.

Research Products

• [Journal Article] Terahertz spectroscopy of the CHD radical (^3A") (2011)
  • Author(s): H.Ozeki, et al.
  • Journal Title: Astronomy and Astrophysics Volume: 527
  • Peer Reviewed
• [Journal Article] Overview and Early Results of the Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES) (2010)
  • Author(s): K.Kikuchi, et al.
  • Journal Title: J.Geophys.Res. Volume: 115
  • Peer Reviewed
• [Journal Article] Hyperfine Resolved Fourier Transform Microwave and Millimeter-wave Spectroscopy of the Iodomethyl Radical, CH_2I(X ^2B_1) (2010)
  • Author(s): S.Bailleux, et al.
  • Journal Title: J.Phys.Chem.A 114 Pages: 4776-4784
  • Peer Reviewed
• [Journal Article] Laboratory Submillimeter-wave Spectroscopy by using a Heterodyne Detection Technique (2009)
  • Author(s): H. Ozeki, H. Ishiwata, K. Kobayashi, K. Kikuchi, T. Yamada, M. Maezawa, S. Kohjiro
  • Journal Title: High Resolution Molecular Spectroscopy 2009(Stabia, Italy)
• [Journal Article] SIS Mixer as Noise Detector for Optimization of Photonic Local Oscillators in Terahertz Range (2009)
  • Author(s): S. Kohjiro, et al.
  • Journal Title: IEEE Trans.Appl.Supercpnd. 19 Pages: 389-395
  • Peer Reviewed
• [Journal Article] Wideband submillimeter-wave spectroscopy with a superconducting heterodyne receiver : New aspects of high-resolution molecular spectroscopy
  • Author(s): H. Ozeki, et al. (著者多数)
  • Journal Title: J. Mol. Spectrosc. (in press)
  • Peer Reviewed
• [Presentation] JEM/SMILES電波分光計の応答特性 (2011)
  • Author(s): Mizobuchi, et al.
  • Organizer: 大気圏シンポジウム2011 (第25回大気圏シンポジウム)
  • Place of Presentation: 宇宙科学研究所相模原キャンパス(神奈川県)
  • Year and Date: 2011-02-21
• [Presentation] CH_2IClのフーリエ変換マイクロ波スペクトル (2010)
  • Author(s): Sakai, et al.
  • Organizer: 第四回分子科学討論会
  • Place of Presentation: 大阪大学(大阪府)
  • Year and Date: 2010-09-14
• [Presentation] In-orbit performance and calibration of SMILES (2010)
  • Author(s): S.Ochiai, et al.
  • Organizer: IRMMW-THz2010 (35th International conference on Infrared and Millimeter waves)
  • Place of Presentation: Rome(Italy)
  • Year and Date: 2010-09-05
• [Presentation] Experimental determination of the rotational partition function by a passive spectrometer (2010)
  • Author(s): H.Ozeki, et al.
  • Organizer: 55^<th> International Symposium on Molecular Spectroscopy
  • Place of Presentation: Columbus (USA)
  • Year and Date: 2010-06-20
• [Presentation] 超伝導サブミリ波リム放射サウンダ(SMILES)によるClO観測:初期観測と比較・検証 (2010)
  • Author(s): Shiotani, et al.
  • Organizer: 日本地球惑星科学連合2010年大会
  • Place of Presentation: 幕張メッセ国際会議場(千葉県)
  • Year and Date: 2010-05-23
• [Presentation] Experimental determination of the rotational partition function by a passive spectrometer (2010)
  • Author(s): H. Ozeki, H. Ishiwata, K. Kobayashi, K. Kikuchi, T. Yamada, M. Maezawa, S. Kohjiro
  • Organizer: 55^<th> International Symposium on Molecular Spectroscopy
  • Place of Presentation: Columbus USA
• [Presentation] テラヘルツ帯超伝導受信機の分子分光学への応用(3) (2009)
  • Author(s): 尾関博之, 他
  • Organizer: 第三回分子科学討論会
  • Place of Presentation: 名古屋
  • Year and Date: 2009-09-24
• [Presentation] テラヘルツ帯分子分光の現状と展望 (2009)
  • Author(s): 尾関博之
  • Organizer: 電子情報通信学会ソサイエティ大会
  • Place of Presentation: 新潟大学(招待講演)
  • Year and Date: 2009-09-15
• [Presentation] テラヘルツ帯分子分光の現状と展望 (2009)
  • Author(s): 尾関博之
  • Organizer: 電子情報通信学会ソサイエティ大会
  • Place of Presentation: 新潟
  • Year and Date: 2009-09-15
• [Presentation] Laboratory submillimeter-wave spectroscopy by using a heterodyne detection technique (2009)
  • Author(s): 尾関博之, et al.
  • Organizer: 21^<st> Colloquium on High Resolution Molecular Spectroscopy
  • Place of Presentation: Naples, Italy
  • Year and Date: 2009-09-03
• [Presentation] 4P020「テラヘルツ帯超伝導受信機の分子分光学への応用(3)」 (2009)
  • Author(s): 尾関博之、石渡久昭、小林かおり、菊池健一、山田陸宏、前澤正明、神代暁
  • Organizer: 第三回分子科学討論会
  • Place of Presentation: 名古屋
• [Presentation] A0.2-0.5 THz Low-Noise Heterodyne Receiver Based on a Superconducting Tunneling Mixer Pumped by a Photonic Local Oscillator (2009)
  • Author(s): S. Kohjiro, et al.
  • Organizer: 2009 Asia-Pacific Microwave Photonics Conference
  • Place of Presentation: Beijing
• [Presentation] テラヘルツ帯超伝導受信機の分子分光学への応用(2) (2008)
  • Author(s): 菊池健一, 神代暁, 前澤正明, 小林かおり, 尾関博之, 石渡久昭
  • Organizer: 分子科学討論会2008
  • Place of Presentation: 福岡国際会議場
  • Year and Date: 2008-09-25
• [Book] 分光測定入門シリーズ(第9巻「電波を用いる分光-地球(惑星)大気、宇宙を探る-」) (2009)
  • Author(s): 住吉吉英、尾関博之、高野秀路
  • Publisher: 講談社サイエンティフィック
• [Book] 分光測定入門シリーズ13 電波を使った分光 -地球(惑星)大気、宇宙を見る (2009)
  • Author(s): 住吉吉英, 高野秀路, 尾関博之
  • Total Pages: 195
  • Publisher: 講談社サイエンティフィック
• [Book] 分光測定入門シリーズ13 電波を使った分光-地球(惑星)大気、宇宙を見る (2009)
  • Author(s): 住吉吉英, 高野秀路, 尾関博之
  • Publisher: 講談社サイェンティフィック
• [Remarks] ホームページ等
  • URL: http://www.env.sci.toho-u.ac.jp/lab/ozeki_lab/index.html
• [Remarks]
  • URL: http://www.env.sci.toho-u.ac.jp/lab/ozeki_lab/index.html
• [Remarks]
  • URL: http://www.env.sci.toho-u.ac.jp/lab/ozeki_lab/index.html