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... • In this theory electrons are considered to be point objects in orbit around the nucleus • It gives a 1st order explanation of the spectral lines, & remains a useful treatment of electron behaviour • Next year you will gain enough QM knowledge to see how the true quantum description of such systems ...
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Population inversion

In science, specifically statistical mechanics, a population inversion occurs while a system (such as a group of atoms or molecules) exists in a state with more members in an excited state than in lower energy states. It is called an ""inversion"" because in many familiar and commonly encountered physical systems, this is not possible. The concept is of fundamental importance in laser science because the production of a population inversion is a necessary step in the workings of a standard laser.
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