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This Demonstration represents the spectra of alkali atoms, that is, the frequency dependence of the optical absorption coefficient ... and the transmission ... of a vapor column (length ... ). Spectra are shown for light tuned near the ... ( ... ) and ... ( ... ) transitions for the most abundant alkali isotopes. The calculation takes the hyperfine structure into account and assumes a pure Doppler broadening of the lines. You can vary the column length ... as well as the atomic density, which is controlled via the temperature-dependent saturated vapor pressure. The level scheme on the right shows the involved (allowed) individual hyperfine transitions that contribute to the spectrum.
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