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$\begingroup$ It's important to emphasize that the natural linewidth is rarely observed directly unless one makes specific efforts to reduce all other types of broadening. In particular, at room temperatures the Doppler broadening - the Doppler shifting of the line according to the thermal distribution of velocities in the gas - will generally swamp most other types of line broadening. $\endgroup$
– Emilio Pisanty
Commented Jun 26, 2015 at 11:10
$\begingroup$ Surely this answer is quite wrong...you can't calculate the linewidth of an atomic transition simply by applying the Heisenberg relationship to the size of the transition??? $\endgroup$
– Marty Green
Commented Nov 15, 2018 at 20:07

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