Using the BCH theorem, we express the Hamiltonian of a Morse oscillator as a complete series of powers of the creation and annihilation operators for the harmonic oscillator. In this way, we improve the results of a previous work that uses a Bogoliubov-Tyablikov tranformation to calculate the Franck-Condon factors by means of equivalent harmonic oscillators potentials. 0 1992John Wiley & Sons, Inc.
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