Reorientations of the Molecular Centers O2- and S2- in the Excited Electronic State

  • L. A. Rebane


An account of possible center’s reorientation processes is presented using the example of impurity molecules O 2 - and S 2 - in alkali halide crystals. Three basic mechanisms of the reorientation of the molecular axes between the equivalent potential wells both in the ground and excited molecular electronic states may be experimentally distinguished. For the centers in thermal equilibrium with the phonons of the crystal there are thermally activated jumps over the potential barrier, thermally activated tunneling through the excited librational state, and phonon-assisted tunneling from the ground librational state. Photostimulated reorientations are also observed in low temperature limits when the thermal equilibrium has not been achieved.


Ground Electronic State Excited Electronic State Molecular Axis Polarization Degree Impurity Molecule 
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Copyright information

© Plenum Press, New York 1978

Authors and Affiliations

  • L. A. Rebane
    • 1
  1. 1.Institute of PhysicsEstonian SSR Academy of SciencesTartuUSSR

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