8 / 21
Page 55
Journal of Astrophysics & Aerospace Technology | ISSN: 2329-6542 | Volume 6
Atomic and Nuclear Physics
4
th
International Conference on
October 26-27, 2018 | Boston, USA
Interatomic potentials, atom energy and screening constants
Alexander N Zinoviev
Ioffe Institute St Petersburg, Russia
S
imple formulae for estimating atom energy (the electron subsystem energy of atom) and screening constant have been
proposed. The formula for the screening constant fits well experimental data on interaction potentials. Quantitative
description of the experiment for the effect of electronic screening on the nuclear synthesis reaction cross-section for the
D+/-D system has been obtained. A conclusion has been made that the differences between the measured cross-sections and
their theoretically predicted values which take place in more complicated cases of nuclear synthesis reactions are not caused by
uncertainties in the knowledge of interatomic potentials. The interatomic potential determines the nuclear stopping power in
materials. Experimental data prove that the approach of determining interatomic potentials from quasielastic scattering can be
successfully used. Experimental data on the scattering of atomic particles were analyzed and an analytical potential form was
proposed as the best fit of the available experimental data. It is shown that Application of any universal potential is limited to
internuclear distances R<7 af (af is the Firsov length).The paper discusses pair-specific interatomic potentials determined both
experimentally and by density-functional theory simulations with the DMol approach to choosing basic wave functions. The
interatomic potentials calculated using the DMol approach demonstrate an unexpectedly good agreement with experimental
data. Differences are mainly observed for heavy atom systems, which suggests that they can be improved by extending the basis
set and more accurately considering the relativistic effects. These data are recommended for modeling collision cascades in
ion-solid collisions.New methods to obtain potential parameters from rainbow scattering features in the atom–metal surface
collisions are discussed. Obtained results differ strongly from the known binary potential models. This difference is explained
by the influence of interaction of the projectile with metal electrons. Observed patterns of black-body radiation.
Biography
Alexander Zinoviev has his expertise in atomic, plasma and nuclear physics. Нe completed his PhD at the age of 31 and later, in 1992, got the status of Dr Habil
from Ioffe Institute in St. Petersburg. He has been selected as a head of the lab of atomic collision in solids. Не is a coordinator of the Atomic Physics Research
at Ioffe Institute.
zinoviev@inprof.ioffe.ru