pyscfad.xtb.util.ke_cutoff_ewald# pyscfad.xtb.util.ke_cutoff_ewald(a, precision=1e-08)[source]# Kinetic energy cutoff for Ewald summation. \[\int_{G_0}^{\infty} dG 4\pi G^2 \frac{4\pi}{G^2} e^{-\frac{G^2}{4a^2}} < \epsilon\]
