Positively charged ions, TenS4+ (n = 1-4), are detected in the laser desorption mass spectra of bulk TeS. Enhanced intensities for these species are seen only for the positive ions. The Clusters are formed as a result of the ion chemistry in the gas phase as elemental mixtures of Te and S also give the Same Clusters, albeit with different intensity distribution. Computational studies confirm the structural and electronic stability of these species. Te3S4+ and Te4S4+ clusters are observed for the first time in the gas phase. (c) 2005 Elsevier B.V. All rights reserved.