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LO-Phonon-Assisted Transitions in the Two-Photon Absorption Spectrum of KI

Richard G. Stafford* and Kwangjai Park

  • Department of Physics, University of Oregon, Eugene, Oregon 97403

  • *To be submitted in partial fulfillment of the requirements for the Ph. D. degree at the University of Oregon, Eugene, Ore. 97403.
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Phys. Rev. B 4, 2006 – Published 15 September, 1971

DOI: https://doi.org/10.1103/PhysRevB.4.2006

Abstract

The two-photon absorption spectrum of KI is measured experimentally with high resolution in the exciton region at approximately 6 °K. Fine structure is resolved in which the 2P exciton is seen at 6.263 eV and a peak at 6.285 eV is identified as a LO-phonon-assisted transition. The exciton-phonon interaction is calculated using third-order time-dependent perturbation theory. The two-band model is used, where the two intermediate states are virtual excitons excited by the photons and the final state is composed of an exciton and LO-phonon. The theoretical prediction of the strength and location of the phonon-assisted peak agrees favorably with the experiment. Calculations are performed with several values for the hole mass; the value 3.0 is chosen as representing a good average for the fourfold-degenerate hole.

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Phys. Rev. B 4, 2006– Published 15 September, 1971
  • Received 9 December 1970

© 1971 American Physical Society

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