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CdS nanoclusters ranging in diameters between 1 and 4 nm were prepared in aqueous solution using aliphatic mercaptoalcohols as ligands. The photon energies of the ls ls absorption and the respective oscillator strengths are in accordance with size quanti zation theory. Nonlinear optical properties are discussed in terms of the influence of trapped charge carriers on the excitonic transition. Onion-shell-like composite parti cles from CdS and HgS were prepared by successive substitution anddoi:10.1098/rsta.1996.0029 fatcat:2cvos2veqzhcngw3rjwpaa47ii