Electronic Resource
College Park, Md.
:
American Institute of Physics (AIP)
The Journal of Chemical Physics
97 (1992), S. 7197-7202
ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
Site relaxation processes of tetracene-h12 and tetracene-d12 guests in p-terphenyl crystals are examined using high-resolution fluorescence and fluorescence excitation spectroscopy. Two of the four sites, the so-called O3 and O4 sites, undergo this process and their phonon sidebands observed in the excitation spectra are characterized by an exceptionally long and well resolved progression of a low-frequency (pseudo-) local phonon mode superimposed on a broad background. Perdeuteration of tetracene results in a frequency reduction of the progression forming mode which identifies this local phonon as a guest librational mode. The latter is suggested to induce the site relaxation via guest reorientation processes. The intensity distribution in the phonon sideband of the O3 site indicates a reorientational angle of ∼21° about the L-axis for the tetracene guest in the excited singlet state.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.463544
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