Ground and excited state dipole moments of coumarin 337 laser dye

This paper reports that the effects of spectral properties of coumarin 337 laser dye have been investigated in different solvents considering solvent parameters like dielectric constant (epsilon) and refractive index (n) of different solvent polarities. The ground state (mu(g)) and excited state (mu(e)) dipole moments are calculated using Lippert's. Bakhshiev's, and Kawski-Chamma-Viallet's equations. In all these three equations the variation of Stokes shift was used to calculate the excited state (mu(e)) dipole moment. It is observed that the Bakhshiev method is comparatively better than the other two methods for ground state and excited state dipole moment calculations. The angle between the excited state and ground state dipole moments is also calculated. (C) 2010 Elsevier B.V. All rights reserved.