[Laser] Prediction of laser emision ?

[Ian Carr-de Avelon]

The field which deals with this is called quantum-chromo-dynamics. To lase
you need almost stable excited states of electrons which a photon in close
proximity will stimulate to emit another photon. The states can all be
calculated, but I've only ever seen programs for the states for hydrogen 
in text books.
Yours
Ian

"Capgi&Co" <capgi@club-internet.fr> Wrote:
>Since some week I read all i can about laser (Web, books) and i am very surprise that there is very few kind of laser (I visible or near spetrum). (Ar, Kr, Ne, Cd, Cr, Cu, Au, CO2, N2, Rare Earth and Semiconductors)
>Is it a physical limitation ?
>Is there some predictive calculation to know if one other element ( like Fe, Zn ...) is able to be use as a laser medium ?
>I look in atomic transition probability tables, but for instance i don't find a maner to explain why Ar+ Kr+ or Cu++ lase.
>Is there some one who heard about this kind of research.
>What atom properties explain the stmulated emission and for some the superradiance emission.