Correlation Field Splitting of Intramolecular Vibrations of Crystalline Tetracene in Terahertz Region

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  • Yago Tomoaki
    Semiconductor Research Institute, Semiconductor Research Foundation
  • Ishikawa Youichi
    Photo Dynamics Research Center, RIKEN
  • Ito Hiromasa
    Photo Dynamics Research Center, RIKEN Research Institute of Electrical Communication, Tohoku University
  • Tanaka Hiromasa
    Photo Dynamics Research Center, RIKEN
  • Kwon Eunsang
    Photo Dynamics Research Center, RIKEN
  • Sakamoto Kenkichi
    Photo Dynamics Research Center, RIKEN Department of Chemistry, Graduate School of Science, Tohoku University
  • Suto Ken
    Department of Material Science, Graduate School of Engineering, Tohoku University
  • Watanabe Minro
    Faculty of Social Welfare, Iwate Prefectural University
  • Nishizawa Jun-ichi
    Semiconductor Research Institute, Semiconductor Research Foundation Photo Dynamics Research Center, RIKEN Iwate Prefectural University

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Abstract

The temperature dependence of terahertz (THz) absorption was observed for molecular crystals of tetracene using the Fourier transform infrared (FT-IR) spectroscopy. Over the frequency range of 1 to 6 THz (33 to 200 cm−1), THz absorptions corresponding to phonon and intramolecular vibrational modes were confirmed. Furthermore, the intramolecular vibrational modes exhibited correlation field splitting that originated from crystallization. A temperature-induced phase transition was successfully detected for the intramolecular vibrational modes of tetracene, even in powder form. Our results showed that these THz absorptions are highly sensitive to the molecular orientations within the crystal.

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