The cluster generation characteristics of some doped silica aerogels wereinvestigated under laser ablation in the negative ion channel by the time-of-flight massspectrometry. Several silica cluster sequences have been formed from the carbon and Rh6Gcoated silica aerosol samples; but no clusters formed from the doP3ntS could be detected. Incontrast; for fullerene-doped silica aerogel only information from fullerene dopant wasobtained; no silica clusters were detected. The structures of the doped silica aerogels play key roles in the laser energy transfer and cluster formation processes.