Infrared (IR) pulse laser ablation of graphite followed by tightly focused ultraviolet (UV) pulse laser irradiation yields C-10(-) predominantly when the delay time between the two laser pulses is set at about 50-200 mu s. The mechanism of the formation of C-10(-) is deduced to be the attachment of slow photoelectrons to neutral C-10 produced by fragmentation of hot neutral clusters of larger sizes. There is an indication that C-10 and its anion have cyclic structures in contrast to the other chainlike clusters.