Coupling strength for resonance force transfer of electronic energy in Van der Waals solids

  • Simpson W
  • Peterson D
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The interpretation of the absorption spectrum of a molecular crystal requires a knowledge of the strength of resonance force electrostatic interaction between molecules in the crystal as compared to an energy parameter characterizing the molecular vibrational level pattern. Depending on the relative magnitudes of these energy terms the spectrum reflects absorption by the crystal as a whole or by independent, though ori.ented m?lecul~s. These ~wo familia: cases are examined from both stationary-state and time-dependent pomts of VIew WIth the object of definmg the energy parameters. The resonance force interaction term is a theoretically derived quantity, the crystal electronic band width; the comparable vibrational energy term is shown to be the width of the total electronic band comprising all the vibronic transitions for an isolated molecule.

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  • William T. Simpson

  • Don L. Peterson

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