Hi, I am trying to understand how one determines the natural linewidth. On my assignment, I am only given an energy (589.1 nm transition in sodium). I have two sources that I have found that seem to contradict each other:(adsbygoogle = window.adsbygoogle || []).push({});

Source 1: Slides 5 and 6

Source 2: Hyperphysics

If I plug in either the lifetime or the energy value provided in the example from the powerpoint (slide 6) into the Hyperphysics calculator, the corresponding value isn't consistent with slide 6.

I am confused on which is the correct formula, as well as how one determines the natural linewidth without knowing the lifetime of a transition. Is the energy of the transition actually relevant?

Can anyone please advise? Thank you for your time and help.

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# Calculation of the Natural Linewidth

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