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Can We See the Energy Densities? I. Insights from Real-Time Time-Dependent Density Functional Theory Simulations
preprintsubmitted on 23.08.2020, 23:40 and posted on 24.08.2020, 13:20 by junjie yang, Zheng Pei, Jingheng Deng, Qin Wu, Yuezhi Mao, Zhibo Yang, bin wang, Christine M. Aikens, Wanzhen Liang, Yihan Shao
In this work, we report a scheme to evaluate and analysis of energy density fluctuations during the real-time time-dependent density functional theory (RT-TDDFT) simulations. Using Ag4–N2 complexes as examples, it is shown that the energy of each molecular fragment (such as Ag4 and N2) can be readily computed by partitioning Kohn-Sham energy densities using Becke or fragment-based Hirshfeld (FBH) scheme. A strong orientation-dependence is observed for theenergy flow between the Ag4 cluster and a nearby N2 molecule in the RT-TDDFT simulations. Future applications of such an energy density analysis in electron dynamics simulations are