Re: photon emission or absorbtion and time

["Bernard G. Cleyet & Nancy Ann Seese" <georgeann@REDSHIFT.COM>]

That was one of the failures of the early, Bohr, quantum theory.  Selection rule violation
results in long life times. (Selection rules are not exact in multielectron atms.)  Long
life times are essential for pop. inversions (lasers and masers) and the nuclear
equivalent in Mössbauer effect (not inversion, just long life.)

bc

Very simple minded, incomplete, and brief, I'm sure.

GARY HEMMINGER wrote:

> We say that a photon is emitted as an electron "falls" to a lower
> energy level.  To my knowledge quantum theory says nothing
> about a duration of time for this transition.  Likewise with photon
> absorbtion.  Has anyone addressed this question?
>
> *****************************************
>   Gary Hemminger
>   Dwight-Engelwood School
>   315 E. Palisade Ave.
>   Englewood, New Jersey
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>   e-mail: hemmig@d-e.org
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