tailieunhanh - Odd even high-order harmonic generation from helium atom approaching from time-dependent density functional theory

In this work, we investigate the validation of the even-to-odd universality helium atom consisting of two electrons, applying the time-dependent density functional theory. The results demonstrate that the multielectron effect manifesting through the repulsive Coulomb and exchange-correlation interactions does not considerably change the universality of the even-to-odd ratio of the helium atom. |