Abstract
The yield of desorbing Cl− ions produced by charge-transfer (CT) photo-dissociation of CC14 adsorbed on a Ag(111) substrate, CCl4/Ag + hν → CCl3/Ag(111) + C1−, is reported as a function of coverage at 193 and 248nm and near the threshold for photoelectron emission at 280nm. The ion emission cross-section is found to be enhanced for the first molecular layer in direct contact with the substrate. The crosssection for ion emission is very low; however the total CT photodissociation crosssection is shown to be large by measuring the yield of CH3C1 produced in the reaction of the Cl− with an overlayer of CH3Br. The CH3Br overlayer lowers the work function and so increases the Cl− emission, confirming the CT mechanism.
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© 1993 Springer-Verlag Berlin Heidelberg
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Dixon-Warren, S.J., Jensen, E.T., Polanyi, J.C. (1993). Charge-Transfer Photodissociation and Photoreaction in Adsorbates at a Metal Surface. In: Burns, A.R., Stechel, E.B., Jennison, D.R. (eds) Desorption Induced by Electronic Transitions DIET V. Springer Series in Surface Sciences, vol 31. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-78080-6_6
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DOI: https://doi.org/10.1007/978-3-642-78080-6_6
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