AbstractFluorescence from S2C1 induced by radiation at 488 nm was observed when the parent molecule S2C12was heated. The dependence of the intensity of fluorescence is third order on laser power. The mechanism of excitation is proposed to be dissociation of hot S2C12after two‐photon absorption to yield hot S2CI and one‐photon absorption of the latter to reach the fluoresing states. The fluorescence spectrum consists of two systems, called α and β here. The lower state of the a system is the ground state χ and that of the β system is assumed to be the à state. The upper states of both systems are unknown but may be related to previously observed slates lying about 460 nm and 330 nm. The vibrational structure of the β system was partially analyzed. The vibrational quantum numbers of the v2and the v3modes in the upper state are assessed to be 26 and 0, respectively, from a count of the number of nodes of the curves of the fluorescence intensity distribution. From the abrupt termination of the intensity curve of v2″ progressions, the absolute v2″ quantum numbers were determined. The excitation was in this way assigned to be (p,q + 6,0)′ ← (m,4,n + 3)″, in which p, q, m and n are no