Parametrization of f(N)-f(N) electric dipole transitions in point-group bases

'Two parametrizations of f(N) - f(N) electric dipole transitions for both t he zero-phonon case and the vibronic case are defined using a point-group b asis. The relationship between the two parameterizations and between the pa rameters for a point-group basis and the JM basis are given. By factorizing the coupling and summing over the partners of the transition states and vi bration modes, the calculation of dipole transition strength is simplified. This method is implemented in the RACAH computer program. Ambiguities in t he parametrizations and the issue of the number of independent polarization measurements required in low symmetry cases are also discussed. (C) 2001 E lsevier Science B.V. All rights reserved.