ChemRxiv
These are preliminary reports that have not been peer-reviewed. They should not be regarded as conclusive, guide clinical practice/health-related behavior, or be reported in news media as established information. For more information, please see our FAQs.
1/1
0/0

First Principles Determination of Electronic Excitations Induced by Charged Particles

preprint
revised on 07.08.2019 and posted on 07.08.2019 by David Lingerfelt, Panchapakesan Ganesh, Jacek Jakowski, Bobby Sumpter
A time dependent self consistent field based method for determining the rates of electronic excitations induced in materials by the presence of external point charges is presented. The method utilizes the full scalar potential of the external point charge in the interaction Hamiltonian instead of relying on multipolar expansions thereof. A general method is presented for determining the conditions under which dipole selection rules are adequate to describe the electronic response of the material to perturbation by external point charges. The position dependence of point charge induced transition rates between the ground and lowest few excited electronic states was resolved for a small polybenzoid. Notably, electronic excitations that are optically forbidden can be strongly allowed for particular positions of the perturbing point charge. Application of the methods detailed here can lead to an improved understanding of the electronic response of materials under irradiation by beams of charged particles.

History

Email Address of Submitting Author

lingerfeltdb@ornl.gov

Institution

Center for Nanophase Materials Sciences, Oak Ridge National Laboratory

Country

United States

ORCID For Submitting Author

0000-0002-5630-0534

Declaration of Conflict of Interest

Authors declare no conflict of interest.

Exports