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Title: Self-interaction effects on charge-transfer collisions

Journal Article · · Physical Review A
 [1];  [2];  [3];  [3]
  1. Florida State Univ., Tallahassee, FL (United States). Department of Physics; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Quantum Simulations Group
  2. Florida State Univ., Tallahassee, FL (United States). Department of Physics
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Quantum Simulations Group

In this article, we investigate the role of the self-interaction error in the simulation of collisions using time-dependent density functional theory (TDDFT) and Ehrenfest dynamics. In addition, we compare many different approximations of the exchange and correlation potential, using as a test system the collision of H+ + CH4 at 30 eV. We find that semilocal approximations, like the Perdew-Burke- Ernzerhof (PBE), and even hybrid functionals, such as the Becke, 3-parameter, Lee-Yang-Parr (B3LYP), produce qualitatively incorrect predictions for the scattering of the proton. This discrepancy appears because the self-interaction error allows the electrons to jump too easily to the proton, leading to radically different forces with respect to the non-self-interacting case. Lastly, from our results, we conclude that using a functional that is self-interaction free is essential to properly describing charge-transfer collisions between ions and molecules in TDDFT.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344; NA0002630
OSTI ID:
1357389
Report Number(s):
LLNL-JRNL--709417
Journal Information:
Physical Review A, Journal Name: Physical Review A Journal Issue: 4 Vol. 95; ISSN PLRAAN; ISSN 2469-9926
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

The neutron lifetime anomaly and charge exchange collisions of trapped protons journal June 2019
Exact Time-Dependent Exchange-Correlation Potential in Electron Scattering Processes journal December 2017
A screened independent atom model for the description of ion collisions from atomic and molecular clusters journal June 2018
A screened independent atom model for the description of ion collisions from atomic and molecular clusters text January 2018

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