Biexciton fluorescence line shape in CdS

  • R. Planel
  • C. Benoî à la Guillaume
Excitonic Molecules
Part of the Lecture Notes in Physics book series (LNP, volume 57)


A careful experimental study of the M line in CdS is presented, with special attention to polarisation properties. The data can be fitted by a theoretical model of the line shape in both polarization (E⊥C and E//C) taking into account the results of group theory, with the recombination of the molecule considered as giving two polaritons. A more precise value of the energy EB(o) of the ground state of the excitonic molecule is obtained EB(o)/2 = 2.5497 eV ± 0.2 meV.


Line Shape Excitation Level Experimental Line Shape Excitonic Molecule Theoretical Line Shape 
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    A more detailed paper on the model has been submitted for publication in Phys. Rev.Google Scholar
  6. 6).
    We have used the following parameter for CdS: ε = 7.3, exciton masses m// = 5.2 mo, m = 0.9 mo; EexL = 2.5540 and ΔLT = 1.9 meV. Our value of photon energies take into account the refractive index of air, a point which has been usually omitted, as in the well known paper of J. J. Hopfield and D. G. Thomas, Phys. Rev. 122 (1961) 35.Google Scholar

Copyright information

© Springer-Verlag 1976

Authors and Affiliations

  • R. Planel
    • 1
  • C. Benoî à la Guillaume
    • 1
  1. 1.Groupe de Physique des Solides de l' Ecole Normale SupérieureUniversité de Paris VIIParis Cedex 05

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