Abstract
Studying highly energetic pentacene impinging on a surface, we demonstrated that the perpendicular component of the momentum drives the dynamics of molecule-molecule interactions and hence the island nucleation process, while the parallel component governs the dynamics of the interactions between the surface and the molecule and therefore determines the sticking coefficient and the island fractality.
Highlights
Studying highly energetic pentacene impinging on a surface, we demonstrated that the perpendicular component of the momentum drives the dynamics of molecule–molecule interactions and the island nucleation process, while the parallel component governs the dynamics of the interactions between the surface and the molecule and determines the sticking coefficient and the island fractality
To gain insight into the growth dynamics, we considered samples obtained after 10 min exposure to the pentacene flux where the onset of island coalescence is not yet reached
The higher the MJ, the larger is the probability for the molecules to be scattered out from the surface plane, so that the overall amount of deposited molecules reduces and the density and size of islands decrease. These can be quantified in the island size distribution shown in Fig. 1(a) and (b) where the histograms of the island size (Aav) under different growth conditions as obtained from AFM images collected over 5 scanning areas of 10 Â 10 mm[2] for each case are reported
Summary
Studying highly energetic pentacene impinging on a surface, we demonstrated that the perpendicular component of the momentum drives the dynamics of molecule–molecule interactions and the island nucleation process, while the parallel component governs the dynamics of the interactions between the surface and the molecule and determines the sticking coefficient and the island fractality. Ek is dominated by a trapping mediated process.[9] The influence of parallel and normal momentum components of the impinging molecules was found to be important for adsorption under these conditions, as demonstrated by applying the energy scaling process in a regime between normal energy scaling[10,11] and total energy scaling.[12,13] so far no detailed study of the critical nucleus size, the variation of molecular island size and the evolution of sub-monolayer coverage for SuMBD growth at different Ek and momentum has been carried out.
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