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Combination of doppler-free polarization spectroscopy and magnetic rotation for the example of IBr

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Abstract

We describe a spectroscopic method which combines for the first time Doppler-free laser polarization spectroscopy with the magnetic rotation technique. This is achieved by the application of a modulating weak magnetic field to the overlap region of modulated pump and probe beam. By the double modulation, molecular levels with effectiveg-factors as low as 0.05 GmB can easily be detected and distinguished from diamagnetic levels. This is demonstrated for the molecule IBr where theB'0+ state is perturbed by a repulsive Ω = 1 state which leads to increasingg-factors with increasing vibrational levels. With the normal polarization spectroscopy, several of these levels are not detectable within the manifold of overlapping lines from I2 and Br2 which are always present in this chemical system. The new method is well suited for characterizing perturbed molecular levels.

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Author notes

  1. M. Siese

    Present address: Fraunhofer Institut für Toxikologie und Aerosolforschung, Nikolai-Fuchs-Strasse 1, D-3000, Hannover, Fed. Rep. Germany

Authors and Affiliations

  1. Institut für Atom- und Molekülphysik, Abteilung Spektroskopie, Universität, Appelstrasse 2, D-3000, Hannover, Fed. Rep. Germany

    M. Siese & E. Tiemann

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  1. M. Siese
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  2. E. Tiemann
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Dedicated to Prof. Dr. Herbert Welling on the occasion of his 60th birthday

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Siese, M., Tiemann, E. Combination of doppler-free polarization spectroscopy and magnetic rotation for the example of IBr. Appl. Phys. B 49, 245–250 (1989). https://doi.org/10.1007/BF00714642

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