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

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Published 10 June 2005 • Copyright (c) 2005 The Japan Society of Applied Physics
, , Citation Tomoaki Yago et al 2005 Jpn. J. Appl. Phys. 44 4145 DOI 10.1143/JJAP.44.4145

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Author affiliations

1 Semiconductor Research Institute, Semiconductor Research Foundation, Kawauchi, Aoba-ku, Sendai 980-0862, Japan

2 Photo Dynamics Research Center, RIKEN, 519-1399 Aramaki, Aoba-ku, Sendai 980-0845, Japan

3 Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan

4 Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan

5 Department of Material Science, Graduate School of Engineering, Tohoku University, Aoba-yama 02, Sendai 980-8579, Japan

6 Faculty of Social Welfare, Iwate Prefectural University, Takizawa, Iwate 020-0193, Japan

7 Iwate Prefectural University, Takizawa, Iwate 020-0193, Japan

Dates

  1. Received 19 August 2004
  2. Accepted 28 February 2005
  3. Published

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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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10.1143/JJAP.44.4145