Intramolecular coupling effect in the refractive index for a simple three-level model of molecules diluted in water

Authors

  • M. Garcia-Sucre,

    1. Centro de Física, Instituto Venezolano de Investigaciones Cientificas, Apartado 21827, Caracas 1020A, Venezuela
    2. Escuela de Química, Universidad Central de Venezuela, Caracas 47102 Venezuela
    3. Instituto de Física e Química de São Carlos, Universidad de São Paulo, Cx.P. 369, 13560, Sã Carlos, SP, Brazil
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  • J. L. Paz,

    1. Departamento de Química, Universidad Simón Bolivar, Apartado 89000, Caracas 1080A, Venezuela
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  • E. Squitieri,

    1. Escuela de Química, Universidad Central de Venezuela, Caracas 47102 Venezuela
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  • V. Mujica

    1. Centro de Física, Instituto Venezolano de Investigaciones Cientificas, Apartado 21827, Caracas 1020A, Venezuela
    2. Escuela de Química, Universidad Central de Venezuela, Caracas 47102 Venezuela
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Abstract

We have calculated the first-, second-, and third-order contribution to the refractive index of a dilute aqueous solution of three-level molecules irradiated by an intense one-frequency external field. Each solute molecule is described by two coupled harmonic curves of electronic energies with the same force constant and with minima displaced in energy and nuclear coordinate. We assume that the intramolecular coupling mixes only the states corresponding to two near degenerate of the three levels considered. Important linear and nonlinear contributions of the solute molecules to the refractive index have been found, mostly in the so-called weak and intermediate coupling regions. © 1993 John Wiley & Sons, Inc.

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