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| atomic
decay + |
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| photon emission |
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|
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| absorption of |
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| photon |
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|
|
| excited state of |
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| atom |
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| hn = Eupper
- Elower |
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|
|
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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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|
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| 2 collisional processes |
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| • | collisional
excitation |
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| • | collisional de-excitation |
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| E = Efinal - Einitial
= h (radiation) OR = 1/2 mv2 (collisional) |