We calculated the he atom ground-state energy using a double generalized Laguerre polynomial in the weakest bound electron potential model (WBEPM) theory.

So we can think about what is our most loosely-bound electron, what's that highest energy orbital, and it's going to be the 2 p orbital, that's going to be what's highest in energy.

In this paper, the problem of surge radiation and ionization of bound electron in the interaction of ultra-short laser pulse and partial ionized plasma was studied for the first time.