Electron and Photon Stimulated Desorption from Organic Molecular Solids: Final State Leading to Desorption
The electron and photon stimulated desorption (ESD, PSD) of ions and excited neutrals from molecular solids has recently received considerable attention. Much work has been performed on small molecules of well-known electronic structure, with the objective of elucidating desorption mechanisms in considerable detail. The work of Stulen, et al  and STOCKBAUER, et al  on hydrogen-bonded films, and that of SAMBE, et al  and ROSENBERG, et al [4,5] on a variety of systems should be mentioned in this regard. Another approach has involved the examination of desorption from larger systems such as neopentane and similar alkanes ; the objectives here have been the discernment of the general features of the ion desorption mechanisms, the extent to which desorption-inducing excitations are localized within the molecule and the influence of chemical structure on the desorption process. Previous studies in this area on alkanes  and partially fluorinated hydrocarbons  have revealed that H+, CH3+, F+, and CF+ desorption results from multi valence hole states localized within functional groups (e.g., CH3), and that these multi-hole states result from the decay of C2s(H+, CH3+) or F2s (F+, CF+) holes. These conclusions are generally similar to those drawn from the studies of simple systems [1–5]. The reasons for localization of a multi-hole excitation within a covalent system have been discussed elsewhere [8,9].
KeywordsHydrocarbon Fluori Tungsten Alkane Cyclohexane
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