Non-Radiative De-Excitation of Highly Excited Self-Trapped Excitons in Alkali Halides--Mechanism of the F and H Centre Production

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  • Non-Radiative De-Excitation of Highly Excited Self-Trapped Excitons in Alkali Halides: Mechanism of the <I>F</I> and <I>H</I> Centre Production
  • Non Radiative De Excitation of Highly E

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We calculate the rates of non-radiative transitions among the excited states of the self-trapped exciton in KCl. The transition matrix elements are calculated using the same semi-empirical molecular orbital method (CNDO) as in our earlier calculations of the energy surfaces and radiolysis mechanism. The results are consistent with current experiments.<BR>One important result is that the non-radiative decay of the lowest electron-excited state of the self-trapped exciton proceeds more rapidly to the lowest hole-excited state than to the ground triplet state. Transfer of excitation energy from the electron to the hole (and hence the production of F and H centres) can proceed rapidly.

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