Analytical calculation of atom ejection from the Ni (111), Ni (001), and Au (001) surfaces in frames of a three-dimensional model |
| |
Authors: | N Yu Tulyakov F L Levkovich-Maslyuk and V N Samoilov |
| |
Abstract: | Atom ejection from lattice sites at the Ni (111) and Ni (001) surfaces in the azimuthal direction toward the center of a lens
consisting of two nearest neighboring atoms in the surface plane is calculated using a developed analytical three-dimensional
model. The types of scattering of ejected atoms are classified in frames of the constructed model. It is found that the first
and second ejection cones are observed in the sputtering pattern in the case of atom ejection from the Ni (111) surface and
that the contribution of strongly blocked atoms to sputtering is considerable. The focusing of sputtered atoms at some angle
from the surface normal is observed. A maximum of the polar angular distribution of sputtered atoms is shifted nonmonotonically
as the energy increases. It is shown that the energy spent by the ejected atom on the recoiling of the lens atoms can be larger
than that spent by this atom to overcome the potential barrier. It is found that small changes in the potential hardness and
the binding energy at the magnetic phase transition can lead to a qualitative change in the ejection pattern. The expressions
for the final ejection angle and energy in the case of Ni in the f-state are found in the form of an expansion in terms of two small parameters. As one passes from the case of atom ejection
from the Ni (001) face to the case of atom ejection from the Au (001) face, the interaction cross section increases significantly
because of an increase in the atomic number and the effects of blocking and focusing turn out to be considerable. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |