Edwin E. Quashie edited Each_simulation_of_the_ion__.tex  almost 8 years ago

Commit id: 0c8db245e75a20924154892e7f358bbe0d649e99

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Since the larger size effects are negligible this calculation used $(3\times3\times3)$ conventional cells containing $108$ host $\mathrm{Cu}$ atoms and $\mathrm{H^+}$.  % also represented by a Troullier-Martins pseudopotential ($17$ valence electrons per copper atom are explicitly considered).   To integrate the Brillouin zone a single $k$-point ($\Gamma$) was used.   The basis set is sampled with a $130~\mathrm{Ry}$ energy cutoff. We also  tested for k-point convergence in a $(3\times3\times3)$ Morkost-Pack grid (for the 108-supercell), that would be equivalent to a 2916   ($108\times 27$ simulation cell of an hypothetical periodic system, including replicas of the proton), for a selected velocities  with negligible differences of 0.08\%. 0.08\%  The projectile $\mathrm{H^+}$ is initially placed in the crystal and a time-\emph{independent} DFT calculation was completed to obtain the converged ground state results that are required for subsequent evolution.   We then perform TDDFT calculations on the electronic system with the moving proton.