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What determines the time it takes for an electron to return to its ground energy stat

 
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Jul16-12, 05:54 PM   #1
 

What determines the time it takes for an electron to return to its ground energy stat


Excluding the process of Phosphorescence, an electron in an excited state will return directly or with a intermediate step to its grown state (like in a ruby LASER before the stimulated emission, where first absorbs a green photon, drops to an intermediary energy level and then emits a red photon by stimulation). But what determines the time it takes for this to happen?
Thank you
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Jul18-12, 11:27 AM   #2
 
I think that time is indeterminate
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