Temperature and coverage control of O2 photofragmentation on Si(111)7 × 7 G. Comtet, G. Dujardin, L. Hellner and A. Mayne Europhys. Lett., 36 5 (1996) 355-360 Published online: 01 September 2002 DOI: 10.1209/epl/i1996-00235-7