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Physisorbed Rare Gas Adlayers
Abstract Within the Born-Oppenheimer approximation, the motion of a rare gas atom in front of a substrate surface can be described with a three dimensional potential energy relief, depending on two coordinates parallel V(x,y) and one perpendicular to the surface V(z). Since the electron affinity of the rare gases is negative and their ionization energy is large compared to the work function of almost all substrates, the electronic configuration of the rare gas atom is only slightly perturbed upon adsorption. Thus, rare gases interact with substrates mainly via induced dipole forces (van der Waals interaction), which can be modelled by a superposition of a long-range van der Waals attractive term (decaying as z-3) and a short range repulsive term. The corresponding adsorption potential is shown in Fig.2.1; the minimum of V(z) determines the adsorption energy in the limit of zero coverage. Particles which are bound to surfaces via these dispersion forces are called physisorbed. Typical physisorption energies range from several to hundreds of meV.
Physisorbed Rare Gas Adlayers
Abstract Within the Born-Oppenheimer approximation, the motion of a rare gas atom in front of a substrate surface can be described with a three dimensional potential energy relief, depending on two coordinates parallel V(x,y) and one perpendicular to the surface V(z). Since the electron affinity of the rare gases is negative and their ionization energy is large compared to the work function of almost all substrates, the electronic configuration of the rare gas atom is only slightly perturbed upon adsorption. Thus, rare gases interact with substrates mainly via induced dipole forces (van der Waals interaction), which can be modelled by a superposition of a long-range van der Waals attractive term (decaying as z-3) and a short range repulsive term. The corresponding adsorption potential is shown in Fig.2.1; the minimum of V(z) determines the adsorption energy in the limit of zero coverage. Particles which are bound to surfaces via these dispersion forces are called physisorbed. Typical physisorption energies range from several to hundreds of meV.
Physisorbed Rare Gas Adlayers
Kern, Klaus (author) / Comsa, George (author)
1988-01-01
44 pages
Article/Chapter (Book)
Electronic Resource
English
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