what are metastable state and population inversion?
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Population inversion, in physics, the redistribution of atomic energy levels that takes place in a system so that laser action can occur. ... Normally, a system of atoms is in temperature equilibrium and there are always more atoms in low energy states than in higher ones.
A metastable state is one in internal equilibrium, that is, within the range of configurations to which there is access by continuous change, the system has the lowest possible free energy.
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