Lifetimes of electronically excited states of molecules on oxide versus metal 
surfaces

Jaeger, R.M.; Homann, K.; Kuhlenbeck, H.; Freund, Hans-Joachim

doi:10.1016/0009-2614(93)89307-4

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Lifetimes of electronically excited states of molecules on oxide versus metal surfaces

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Jaeger, R., Homann, K., Kuhlenbeck, H., & Freund, H.-J. (1993). Lifetimes of electronically excited states of molecules on oxide versus metal surfaces. Chemical Physics Letters, 203(1), 41-45. doi:10.1016/0009-2614(93)89307-4.

Cite as: https://hdl.handle.net/21.11116/0000-000E-58A6-4

Abstract

The optically forbidden ¹Σ⁺→a³Π transition of CO adsorbed on an epitaxially grown Al₂O₃ (111) surface has been studied by means of electron energy loss spectroscopy. On this surface several CO adsorption states exist with adsorption enthalpies ranging from 88 (multilayer) to 170 meV. For the first time even in the (sub) monolayer range the vibrational fine structure of the energy loss peaks due to the ¹Σ⁺→a³Π electronic transition of adsorbed CO could be clearly resolved. The half widths of the loss peaks have been used to estimate the lifetimes of the excited states.