1、To assign more than three degrees of freedom to a helium atom would lead to incorrect predictions.
2、So let's take two cases of shielding if we're talking about, for example, the helium, a helium nucleus or a helium atom.
3、When we plug it into equations we just use the number, e So, let's think of what we could have if we have two electrons in a helium atom that are shielded in two extreme ways.
4、Electron-electron correlation in the doubly excited states of the helium atom has been investigated by partial wave analysis, thereby the geometric character of relevant states has been revealed.
