Pressure dependence of the Davydov splitting in tetracene single crystals |
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Authors: | J Kalinowski R Jankowiak |
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Institution: | Institute of Physics, Technical University of Gdańsk, 80-952 Gdańsk, Poland |
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Abstract: | The reflection spectrum of the OO component of the first singlet transition of tetracene single crystal has been measured as a function of pressure in the range 1 atm–6.5 kbar. A discontinuous change in the Davydov splitting occurs near 3 kbar confirming the existence of a pressure-induced first order phase transition discovered recently by measurements of the magnetic field anisotropy in the single crystal tetracene fluorescence. The pressure-induced spectral red-shifts are larger in the low-pressure (LP) phase than those in the high-pressure (HP) crystal structure. The Davydov splitting of the OO band however increases with increasing pressure at a larger rate of 57 cm?1/kbar for the HP phase as compared with 46 cm?1/kbar for the LP phase. |
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