Stark effects on quasilinear chain excitons in dibromonaphthalene

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Abstract
Electric field perturbations on the singlet–triplet spectra of 1,4‐dibromonaphthalene (DBN) are presented. Studies of the neat crystal exciton (Δμ=0.15±0.02 and 0.16±0.02 D) and of proto in deutero DBN (Δμ=0.12±0.02 and 0.13±0.02 D) gave nonidentical but similar results. The X traps at 4958 and 4960 Å were found to have their dipoles oriented differently than host molecules. The two sublattices of the crystal were found to have significantly different values of Δμ (4952 Å, Δμ=0.16 D; 4937 Å, Δμ=0.06 D). The field dependence of the exciton Stark effect generated an upper limit value of 0.01 cm−1 for the interstack coupling in DBN. Nonlinear field dependent effects are attributed to field induced structural modifications.