Molecular Dynamics Simulation of Bulk Desorption
In static SIMS, molecular desorption may occur from the uppermost molecular surface layer by momentum transfer in the collision cascade. However, this does not seem an appropriate picture for liquid SIMS. It is widely accepted, that the neutral yield in LSIMS is large, ca. 103 in the case of glycerol[1,2]. Probably, all the molecules in a cavity centered around the original collision cascade are desorbed. This liquid-to-gas transition may occur more or less homogeneously and is conveniently termed “bulk desorption” as opposed to momentum-induced desorption. In this general sense, laser desorption and plasma desorption are most likely also bulk desorption processes.
KeywordsDesorption Process Spinodal Decomposition Collision Cascade Molecular Dynamic Result Plasma Desorption
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