| 1. | Also, it was noted that excited atoms emit radiation with discrete frequencies.
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| 2. | The smileys :-( and :-) represent ground and optically excited atoms, respectively.
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| 3. | It has rather a simple structure to indicate energy levels of excited atom.
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| 4. | These two photons can each stimulate two more excited atoms, and so on.
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| 5. | The ejected photoelectron interacts with electrons in the surrounding non-excited atoms.
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| 6. | There is also photon emission by de-excited atoms and molecules in the gases.
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| 7. | Often it accompanies light emission from excited atoms or molecules in the gas.
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| 8. | Many such excited atoms induce emissions of photons sufficient for laser action to occur.
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| 9. | A well-known example from quantum mechanics is the explanation for the excited atoms of hydrogen.
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| 10. | Indirect photoionization can then occur when electron collisions with the excited atom eject an atomic electron.
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