Probing surface properties with hyperthermal polyatomic ions: Scattering of C[sub 60][sup +] from highly oriented pyrolitic graphite, Au (111), and n-alkylthiol self-assembled monolayers

Hillenkamp, Matthias; Jester, Stefan-Sven; Kappes, Manfred M.
April 2002
Journal of Chemical Physics;4/15/2002, Vol. 116 Issue 15, p6764
Academic Journal
The influence of surface properties on the kinematics associated with hyperthermal grazing incidence scattering (E[sub coll]=200–1000 eV, θ[sub in]=75°) of large polyatomic ions was studied using the model projectile C[sub 60][sup +]. Surfaces employed were highly oriented pyrolitic graphite (HOPG), thin gold films on mica and self-assembled monolayers (SAMs) of n-alkylthiols on gold (of various chain lengths). Scattering kinematics was probed by measuring product angular and kinetic energy distributions. The internal energy distribution of scattered C[sub 60][sup +*] was determined with the help of unimolecular rate theory fits of resulting fragment mass spectra. HOPG and gold targets show qualitatively comparable scattering behavior, i.e., both collision energy dependent subspecular scattering and partitioning of collision energy into possible degrees of freedom are similar. SAMs, comprised of molecules which may be deformed easily with respect to each other and to the surface, behave quite differently. Specular scattering as well as uptake of a significantly larger amount of the incident kinetic energy (E[sub coll]) into the surface is observed—independent of chain length or chemical composition. Coupling of E[sub coll] into scattered projectile vibrations is found to be chain length dependent, with two classes of behavior observed. © 2002 American Institute of Physics.


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