Development of near-IR multiplex inverse Raman spectrometer and its application to elucidation of mechanism of photoconductivity

• Project/Area Number: 24750023
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Physical chemistry
• Research Institution: Gakushuin University
• Principal Investigator: TAKAYA TOMOHISA 学習院大学, 理学部, 助教 (70466796)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2012: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: 時間分解分光 / 逆ラマン分光 / 近赤外分光 / 光電子移動 / 導電性高分子

Outline of Final Research Achievements

We have developed a near-IR Raman spectrometer for observing structures of samples at molecular level without photodamage. The mechanism of energy dissipation from photoexcited beta-carotene has been revealed with the spectrometer. Stimulated Raman spectra of photoconductive polymers photoexcited with blue light have been recorded. The results strongly indicate that positively charged states are formed in the polymer in solutions. We have suggested the structure of the charged states and the mechanism of their formation from the peak position of the Raman signal and its time dependence.

Research Products

• [Journal Article] Femtosecond time-resolved near-infrared spectroscopy of oligothiophenes and polythiophene: Energy location and effective conjugation length of their low-lying excited states (2015)
  • Author(s): Shunnosuke Okino, Tomohisa Takaya, and Koichi Iwata
  • Journal Title: Chem. Lett. Volume: 44 Issue: 8 Pages: 1059-1061
  • DOI: 10.1246/cl.150330
  • NAID: 130005092604
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Relaxation Mechanism of β-Carotene from S2 (1Bu+) State to S1 (2Ag-) State: Femtosecond Time-Resolved Near-IR Absorption and Stimulated Resonance Raman Studies in 900-1550 nm Region (2014)
  • Author(s): Tomohisa Takaya and Koichi Iwata
  • Journal Title: J. Phys. Chem. A Volume: 118 Issue: 23 Pages: 4071-4078
  • DOI: 10.1021/jp504272h
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] (To be announced) (2015)
  • Author(s): Tomohisa Takaya and Koichi Iwata
  • Organizer: The 5th Asian Spectroscopy Conference
  • Place of Presentation: Sydney, Australia
  • Year and Date: 2015-09-29 – 2015-10-02
  • Invited
• [Presentation] Femtosecond time-resolved near-IR stimulated Raman study on excitation dynamics of large pi-conjugate systems: From carotenoids to photoconductive polymers (2015)
  • Author(s): Tomohisa Takaya and Koichi Iwata
  • Organizer: The XVIIth International Conference on Time-Resolved Vibrational Spectroscopy
  • Place of Presentation: Madison, WI, USA
  • Year and Date: 2015-06-21 – 2015-06-26
  • Invited
• [Presentation] Structure and Dynamics of Self-Localized Excitations in Photoconductive Polymers Studied by Femtosecond Near-IR Stimulated Raman Spectroscopy (2015)
  • Author(s): Tomohisa Takaya
  • Organizer: 日本化学会第95春季年会
  • Place of Presentation: 日本大学，千葉県船橋市
  • Year and Date: 2015-03-26 – 2015-03-29
  • Invited
• [Presentation] ポリ(3-ヘキシルチオフェン)溶液のフェムト秒時間分解近赤外誘導ラマンスペクトルと特異値分解バンド解析 (2015)
  • Author(s): 高屋智久，岩田耕一
  • Organizer: 日本化学会第95春季年会
  • Place of Presentation: 日本大学，千葉県船橋市
  • Year and Date: 2015-03-26 – 2015-03-29
• [Presentation] Femtosecond multiplex stimulated Raman spectroscopy in near-IR (2014)
  • Author(s): Tomohisa Takaya and Koichi Iwata
  • Organizer: SciX 2014
  • Place of Presentation: Reno, NV, USA
  • Year and Date: 2014-09-28 – 2014-10-03
  • Invited
• [Presentation] ポリ(3-ヘキシルチオフェン)混合物薄膜中に光生成した電荷担体の近赤外共鳴誘導ラマンスペクトル (2014)
  • Author(s): 高屋智久，榎田一平，岩田耕一，古川行夫
  • Organizer: 第8回分子科学討論会
  • Place of Presentation: 広島大学，広島県東広島市
  • Year and Date: 2014-09-21 – 2014-09-24
• [Presentation] Vibrational relaxation dynamics of carotenoids photoexcited with excess energy: A femtosecond time-resolved near-IR stimulated Raman study (2014)
  • Author(s): Tomohisa Takaya and Koichi Iwata
  • Organizer: The XXIVth International Conference on Raman Spectroscopy
  • Place of Presentation: Jena, Germany
  • Year and Date: 2014-08-10 – 2014-08-15
• [Presentation] Ultrafast multiplex near-IR resonance stimulated Raman spectroscopy in 1.0-1.6 um region (2014)
  • Author(s): Tomohisa Takaya and Koichi Iwata
  • Organizer: The 5th International Conference on Perspectives in Vibrational Spectroscopy
  • Place of Presentation: Trivandrum, India
  • Year and Date: 2014-07-08 – 2014-07-12
  • Invited
• [Presentation] 超高速時間分解近赤外吸収および異方性分光法の開発と凝縮相ダイナミクスへの応用 (2014)
  • Author(s): 高屋智久
  • Organizer: 平成26年度日本分光学会年次講演会
  • Place of Presentation: 理化学研究所，埼玉県和光市
  • Year and Date: 2014-05-26 – 2014-05-28
  • Invited
• [Presentation] Structure and dynamics of π-conjugated systems studied by femtosecond near-IR absorption and stimulated Raman spectroscopy (2014)
  • Author(s): Tomohisa Takaya
  • Organizer: Trombay Symposium on Radiation and Photochemistry 2014
  • Place of Presentation: Barbar Atomic Research Centre, Mumbai, India
  • Invited
• [Presentation] Femtosecond near-IR multiplex stimulated Raman gain and loss spectroscopy of β-carotene in 1.0-1.6 μm region (2013)
  • Author(s): Tomohisa Takaya and Koichi Iwata
  • Organizer: XVIth International Conference on Time-Resolved Vibrational Spectroscopy
  • Place of Presentation: Beppu, Oita, Japan
• [Presentation] Structure and dynamics of photoexcited polythiophene as studied by femtosecond time-resolved near-IR inverse Raman spectroscopy (2013)
  • Author(s): Tomohisa Takaya and Koichi Iwata
  • Organizer: 7th International Conference on Advanced Vibrational Spectroscopy
  • Place of Presentation: Kobe, Japan
• [Presentation] フェムト秒時間分解近赤外誘導ラマン分光によるβ-カロテンS2状態の振動緩和ダイナミクスの観測 (2013)
  • Author(s): 高屋智久，岩田耕一
  • Organizer: 第7回分子科学討論会
  • Place of Presentation: 京都テルサ
• [Presentation] Construction of ultrafast time-resolved near-IR multiplex stimulated Raman spectrometer and observation of excited-state dynamics of photoconductive polymer (2013)
  • Author(s): Tomohisa Takaya and Koichi Iwata
  • Organizer: 日本分光学会年次講演会2013
  • Place of Presentation: 大阪大学豊中キャンパス
• [Presentation] β-カロテンS2状態の時間分解近赤外誘導ラマンスペクトル (2013)
  • Author(s): 高屋智久，岩田耕一
  • Organizer: 日本化学会第93春季年会
  • Place of Presentation: 立命館大学びわこ・くさつキャンパス
• [Presentation] Femtosecond near-IR multiplex stimulated Raman gain and loss spectroscopy of β-carotene in 1.0 - 1.6 μm region (2013)
  • Author(s): Tomohisa Takaya and Koichi Iwata
  • Organizer: XVIth International Conference on Time-Resolved Vibrational Spectroscopy
  • Place of Presentation: Beppu, Oita, Japan
• [Presentation] β-カロテン励起状態の近赤外共鳴逆ラマンスペクトルおよび二重共鳴２光子スペクトルの同時測定 (2012)
  • Author(s): 高屋智久，岩田耕一
  • Organizer: 第６回分子科学討論会
  • Place of Presentation: 東京大学本郷キャンパス
• [Remarks] 岩田研究室：フェムト秒時間分解マルチプレックス近赤外誘導ラマン分光計 (専門の方向け)
  • URL: http://www-cc.gakushuin.ac.jp/~20040130/reseach.deta/femtoNIRraman.htm
• [Remarks] 岩田研究室：フェムト秒時間分解マルチプレックス近赤外誘導ラマン分光計 (一般向け)
  • URL: http://www-cc.gakushuin.ac.jp/~20040130/reseach.deta/femtoNIRraman_e.htm