Abstract
Among all the interrelated coherence effects in atomic spectroscopy the quantum beat (interference) |l-4| phenomenon is conceptually the most basic one from which the other methods like the zero- |1,5| or high field-|6| level crossing can be derived. For this reason and reasons related to the experimental potentials of BFS I choose mainly quantum beats for the discussion of coherence in FBS. For the physical interpretation of QBs we choose a four level system (i,l,2,f) in Fig. la with two nearly degenerate levels 1 and 2 separated by an energy interval ħω21 = ħ (ω2-ω1). We assume that an ensemble of such atoms is irradiated by a light pulse of length δt at t=0 and that the reemitted (scattered) light intensity is observed as a function of time t through a detection time window Δt centered at t.
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Andrä, H.J. (1978). Coherence in Beam-Foil Spectroscopy. In: Arecchi, F.T., Bonifacio, R., Scully, M.O. (eds) Coherence in Spectroscopy and Modern Physics. NATO Advanced Study Institutes Series, vol 37. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-2871-1_10
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