Charge-transfer photodissociation of adsorbed molecules via electron image states

Details Charge-transfer photodissociation of adsorbed molecules via electron image states Charge-transfer photodissociation of adsorbed molecules via electron image states

2007-09-12

arxiv.org/abs/0709.1953v2

Physics

Chemical Physics

submitted to Journal of Chemical Physics

Scientific paper

10.1063/1.2822331

The 248nm and 193nm photodissociation of submonolayer quantities of CH$_3$Br and CH$_3$I adsorbed on thin layers of n-hexane indicate that the dissociation is caused by dissociative electron attachment from sub-vacuum level photoelectrons created in the copper substrate. The characteristics of this photodissociation-- translation energy distributions and coverage dependences show that the dissociation is mediated by an image potential state which temporarily traps the photoelectrons near the n-hexane--vacuum interface, and then the charge transfers from this image state to the affinity level of a co-adsorbed halomethane which then dissociates.

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