| atomic decay w/ |
| photon emission |
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| absorption of |
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| photon |
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| excited state of atom |
| hn = Eupper - Elower |
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| 3 radiative
processes : |
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| • | photon absorption |
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| • | spontaneous decay w/ emission of photon |
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| • | stimulated emission |
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| 2 collisional
processes: |
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| • | collisional excitation |
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| • | collisional de-excitation |
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| D E = Efinal - Einitial = hn (radiation) , 1/2 mv2
(collisional) |