Lifetime an atom can spend in an excited state

randa177
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Can you please give me a hint to start this problem?

The Einstein Aij coefficients are related to the lifetime an atom can spend in an excited state i before going to state j. Using Heisenberg’s Uncertainty Principle, show that large values of Aij lead to line profiles with large values of (lamda)

Thanks
 
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Heisenberg uncertainty principle: \Delta E \cdot \Delta t \sim \hbar

Let delta-t be the lifetime of the state. How is E related to lambda?
 
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Oh, thanks a lot! That is very easy now!
Thanks
Randa
 
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