Noun
a definite stable energy that a physical system can have; used especially of the state of electrons in atoms or molecules
Source: WordNetaccording to quantum theory only certain energy levels are possible Source: Internet
Additionally, an electron always tends to fall to the lowest possible energy state. Source: Internet
Adiabatic ionization is a form of ionization in which an electron is removed from or added to an atom or molecule in its lowest energy state to form an ion in its lowest energy state. Source: Internet
An electron in an excited state may decay to a lower energy state which is not occupied, according to a particular time constant characterizing that transition. Source: Internet
A strong inhomogeneous magnetic field will separate out atoms in the higher energy state from a beam of mixed state atoms. Source: Internet
A transition from the higher to a lower energy state, however, produces an additional photon; this is the process of stimulated emission. Source: Internet