High Resolution Spectroscopy with Tunable Dye Lasers



If tunable dye lasers are used for the spectroscopic investigation of electronically excited atoms and molecules two groups of methods are available which yield a resolution comparable to the natural width of the investigated transitions. To the first group belong the well known methods of radio frequency spectroscopy as for example the optical double resonance method and furthermore the purely optical techniques such as the level crossing method and the observation of quantum beats. For this group of methods a narrow spectral distribution of the exciting light is not needed, in fact a broad banded excitation is even more favorable. The advantage of the use of tunable dye lasers for these experiments, compared to an excitation with classical light sources, is that a higher population of the excited states may be achieved. This results in a better signal to noise ratio and in a more accurate measurement. Furthermore, levels can now be populated which could not be reached by the excitation with discharge lamps since the corresponding transition probabilities are too small.


Atomic Beam Zero Field Beat Signal Quantum Beat Natural Width 
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Copyright information

© Plenum Press, New York 1974

Authors and Affiliations

  1. 1.I. Physikalisches InstitutUniversität zu KölnKölnFederal Republic of Germany

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