2257
J. Phys. Chem. 1993,97, 2257-2261
Dynamics of Photodissociation of CHd/Ag( 11 1) at 248 nm E. T. Jensen and J. C. Polanyi' Department of Chemistry, University of Toronto, 80 St. George St., Toronto, Ontario, Canada M5S 1Al Received: November 5, 1992; In Final Form: January'7. 1993
The photodissociation of CHjI/Ag( 1 1 1) at 248 nm has been studied using time-of-flight mass spectrometry to detect the CH3 photofragments. At submonolayer CH3I coverage, the CH3I photodissociation was quenched by interactions with the metal substrate; at higher coverages (1 < 6 < 20 ML) fast CH3 photofragments were observed. The total yield of these C H j photofragments varied as a function of coverage from zero (
