We present phosphorescence wavelength selected optically detected magnetic resonance (ODMR) experiments on some aromatic molecules in organic glasses. The change of the ODMR frequency and width as a function of phosphorescence wavelength is interpreted in terms of a spinless stochastic Hamiltonian which describes the interaction between the probe molecule and the solvent. It is shown that the phonons in the optical spectra have a significant influence on the parameters of the ODMR profile.
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