| Spontaneous Emission |
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If the atom is in the excited state with energy , it may spontaneously decay into the ground state, with energy , releasing the difference in energies between the two states as a photon. The photon will have Frequency and Energy , given by: :, where ''h'' is Planck's Constant . The Phase of the photon in spontaneous emission is random as is the direction the photon propagates in. This is not true for Stimulated Emission . An energy level diagram illustrating the process is shown below:
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