Coherence in the Phosphorescence Triplet State of Naphthalene in Dihalobenzenes

Abstract

The use of multiple pulse sequence in the lowest phosphorescent triplet state of naphthalene in single crystals of dihalobenzenes, p-dichlorobenzene and p-dibromobenzene is reported. Spin relaxation times from these experiments indicate that the external perturbations from the halogens overwhelm subtle intramolecular interactions such as deuteration of the guest naphthalene molecule. In addition, the use of a new method of determining the nature of line width broadening is reported. The result of the presaturated pulse optically detected magnetic resonance (ODMR) shows that the zero Held ODMR of naphthalene in dihalobenzenes is inhomogeneously broadened for the bulk of the spins.