Picosecond Polarization Grating Study of the Effect of Excess Excitation Energy on the Rotational Dynamics of Rhodamine 6G in Different Electronic States
|Published in||Journal of Physical Chemistry. C. 1996, vol. 100, no. 21, p. 8628-8632|
|Abstract||The effect of excess excitation energy on the rotational dynamics of rhodamine 6G in the ground and the first singlet excited state has been investigated in series of n-alcohols and alkanenitriles using the picosecond polarization grating technique. In nitriles, the reorientation times are the same for excitation at the S1 ← S0 and S2 ← S0 transitions, and no state dependence could be detected. In alcohols, the rotational dynamics of rhodamine 6G in the excited state is about 25% faster when formed with 1.15 eV excess excitation energy. This effect is ascribed to a decrease of the hydrodynamic volume due to dissociation of solute/solvent hydrogen bond following intramolecular vibrational redistribution. An accompanying perturbation of the solvent shell structure caused by the fast local temperature jump is not excluded.|
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|Research group||Groupe Vauthey|
|GUMY, Jean-Claude, VAUTHEY, Eric. Picosecond Polarization Grating Study of the Effect of Excess Excitation Energy on the Rotational Dynamics of Rhodamine 6G in Different Electronic States. In: Journal of Physical Chemistry. C, 1996, vol. 100, n° 21, p. 8628-8632. https://archive-ouverte.unige.ch/unige:2982|