X. Zhou, J. White
May 1, 1990
Citations
1
Influential Citations
55
Citations
Journal
Journal of Chemical Physics
Abstract
The surface chemistry, induced by UV photons and low energy electrons, of chlorobenzene (C6H5Cl) on Ag(111) has been studied. C6H5Cl adsorbs molecularly on Ag(111) at 100 K and desorbs molecularly at 170 K (physisorbed) and 230–240 K (chemisorbed) with no thermal decomposition. The adsorption is accompanied by a surface work function change (ΔΦ) of −0.65 eV at one monolayer and −0.9 eV at multilayer coverages. Both UV photons and low energy electrons induce the decomposition of adsorbed C6H5Cl. The energy threshold for the decomposition is 3.5–3.8 eV for photons and ∼5 eV for electrons. For photons and <12 eV electrons, the decomposition involves only C–Cl bond cleavage, producing surface phenyl groups and Cl atoms. Phenyl groups recombine and desorb as biphenyl at 390–400 K during post‐irradiation temperature programmed desorption (TPD). They do not dehydrogenate. However, for electron energies higher than ∼12 eV, the decomposition involves cleavage of C–H, C–Cl, and, probably, C–C bonds. In this case, p...