TY - JOUR
T1 - Sticking of rare gas atoms in wetting and nonwetting systems
AU - Menzel, D.
AU - Brenig, W.
AU - Brunner, T.
AU - Frieß, W.
AU - Schlichting, H.
PY - 1993/12/12
Y1 - 1993/12/12
N2 - In earlier work we have investigated the sticking of the rare gases Ne to Xe on a typical flat transition metal surface, Ru(001), on which layer-by-layer growth occurs, i.e. which constitute wetting systems. Theoretical modelling using forced-oscillator calculations with a minimum of free parameters was able to reproduce the initial sticking coefficinets, s0, and their dependence on gas temperature using essentially one free parameter; in particular the strong quantum effect of zero phonon scattering can be well understood in this model. As further tests we have measured the s0-values of the same gases on slightly (H-covered Ru(001); Pt(111)) and strongly (K-mono- and multilayers on Ru(001)) modified surfaces. In particular the latter systems constitute sensitive tests of the model, since here the interaction energies of the rare gases with the surface are smaller than those on their own solid, so that 3D island growth occurs from very low coverages on; i.e., they constitute nonwetting systems. Our model is able to explain the results even for such strongly varying interaction parameters qualitatively and, where fully applicable, quantitatively.
AB - In earlier work we have investigated the sticking of the rare gases Ne to Xe on a typical flat transition metal surface, Ru(001), on which layer-by-layer growth occurs, i.e. which constitute wetting systems. Theoretical modelling using forced-oscillator calculations with a minimum of free parameters was able to reproduce the initial sticking coefficinets, s0, and their dependence on gas temperature using essentially one free parameter; in particular the strong quantum effect of zero phonon scattering can be well understood in this model. As further tests we have measured the s0-values of the same gases on slightly (H-covered Ru(001); Pt(111)) and strongly (K-mono- and multilayers on Ru(001)) modified surfaces. In particular the latter systems constitute sensitive tests of the model, since here the interaction energies of the rare gases with the surface are smaller than those on their own solid, so that 3D island growth occurs from very low coverages on; i.e., they constitute nonwetting systems. Our model is able to explain the results even for such strongly varying interaction parameters qualitatively and, where fully applicable, quantitatively.
UR - http://www.scopus.com/inward/record.url?scp=0343511979&partnerID=8YFLogxK
U2 - 10.1016/0368-2048(93)80125-6
DO - 10.1016/0368-2048(93)80125-6
M3 - Article
AN - SCOPUS:0343511979
SN - 0368-2048
VL - 64-65
SP - 583
EP - 590
JO - Journal of Electron Spectroscopy and Related Phenomena
JF - Journal of Electron Spectroscopy and Related Phenomena
IS - C
ER -