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Dissociative electron attachment in effusive beams of S 2 has been studied in the incident electron energy range 0-11 eV. Two S − processes are observed at 2.4 and around 4.55 eV. From the ion kinetic energy and angular distributions, the symmetries of the dissociative S − 2 resonant states have been determined as 4 − u and 2 u . In the sulphur vapour S n (2 n 8), S − n formation occurs at zero energy and around 4 and 7.5 eV, in addition to the S − /S 2 processes.