A laser requires a metastable state that is a relatively long- lived excited atomic state. What is the uncertainly in the energy of the metastable state compared to non-metastable excited states?
Answer to relevant QuestionsWhy is the energy threshold for electron–positron pair production actually higher than the sum of their two masses (1.022 MeV in energy terms)? What is the energy of a beam of electrons that exhibits a first-order maximum at an angle of when diffracted by a crystal grating with a lattice plane spacing of 0.215 nm? How many possible sets of quantum numbers are there for the subshells with (a) ℓ = 2 and (b) ℓ = 3? (a) If there were no electron spin, the 1s state would contain a maximum of (1) zero, (2) one, (3) two electrons. Why? (b) What would be the first two inert or noble gases if there were no electron spin? (a) If the lifetime of excited state A is longer than that of another excited state B, then the width of a spectral line due to natural broadening for a transition from state A to the ground state will be (1) smaller than, ...
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