Abstract
Abstract We measured Zeeman effects for rotationally resolved spectra of several low-lying vibrational bands of the S1 ← S0 transition of benzene and naphthalene. We demonstrated that for both benzene and naphthalene (i) Zeeman splittings of the rotational lines were caused by a magnetic moment of the S1 state, and (ii) the magnetic moment lies perpendicular to the molecular plane and originates from an electronic angular momentum induced by J–L coupling between the S1 and S2 states. We found from the Zeeman spectra that the rotational levels of the S1 state are not mixed with a triplet state, and all the perturbing levels were found to be a singlet state. Coupling to a triplet state was shown not to be responsible for nonradiative relaxation. Accordingly, intersystem crossing is not the dominant nonradiative process at low-lying vibrational states, and the main nonradiative process is presumed to be internal conversion.
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