Raman Scattering for Weakened Bonds in the Intermediate States of Impurity Centres

  • Imbi Tehver
  • G. Benedek
  • V. Boltrushko
  • V. Hizhnyakov
  • T. Vaikjärv
Chapter
Part of the Progress in Theoretical Chemistry and Physics book series (PTCP, volume 23)

Abstract

A theory of the Raman scattering in resonance with an electronic transition causing a strong softening of vibrations is proposed. In this case the potential surface of the excited state has a flat minimum or maximum in the configurational coordinate space. Two cases of the vibronic coupling are considered: (1) the coupling with a single coordinate and (2) the coupling with the phonon continuum. To describe the Raman scattering the Fourier-amplitude method is applied. In the first case the calculations are performed for the pseudo-Jahn-Teller effect in the excited state. In the second case, despite a strong mixing of phonons, the equations for the Raman Fourier amplitudes can be factorized and solved analytically. It is predicted that the second-order Raman scattering will be strongly enhanced. Moreover, the second-order Raman scattering is also enhanced as compared to the first-order scattering. The Raman excitation profiles show a structure caused by the Airy oscillations. The theory is applied to the triplet-triplet optical transition in Na2 molecule confined at the surface of a 4He droplet.

Keywords

Raman Scattering Excited Electronic State Fourier Amplitude Vibronic Coupling Vibronic Interaction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The research was supported by the target-financed grant TLOFY0145 and ESF grant GLOFY7741.

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Imbi Tehver
    • 1
  • G. Benedek
    • 2
    • 3
  • V. Boltrushko
    • 1
  • V. Hizhnyakov
    • 1
  • T. Vaikjärv
    • 1
  1. 1.Institute of PhysicsUniversity of TartuTartuEstonia
  2. 2.Donostia International Physics CenterSan SebastianSpain
  3. 3.Department of Materials ScienceUniversity of Milano-BicoccaMilanItaly

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