Journal of Photoscience
- Volume 12 Issue 3
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- Pages.119-122
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- 2005
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- 1225-8555(pISSN)
Experimentally Measured Rotational Reorientation Time of Coumarin 6 Laser Dye in Ethanol and Acetonitrile Solvents
- Renuka, C.G. (Department of Physics, Karnatak University) ;
- Raikar, U.S. (Department of Physics, Karnatak University)
- Published : 2005.12.31
Abstract
The photophysical properties of coumarin 6 laser dye have been studied in two solvents; ethanol and acetonitrile using steady-state fluorescence depolarization technique. The experimentally measured reorientation time of coumarin 6 is more or less the same in given solvents at particular temperature. It is found that coumarin 6 rotates slower in acetonitrile than in ethanol especially at higher values of viscosity over temperature. We also measure the ground and excited state dipole moments of coumarin 6 by solvent perturbation method. The results found that excited state dipole moment is greater than ground state dipole moment, which indicates that excited state is more polar than the ground state.
Keywords
- Coumarin 6 laser dye;
- fluorescence polarization;
- rotational reorientation;
- anisotropy, dipole moment