Abstract
When an insulator is subjected to ionizing radiation of high intensity, relatively large concentrations of mobile excited states such as excitons and electrons (holes) can coexist. The possibility of creating a bound state (excitonic ion) between the electron (or hole) and an exciton was first suggested by Lampert [1], and several theoretical papers have since appeared that have discussed the question of the stability of such a state consisting of a free electron (or hole) and an exciton of either the Frenkel type or Wannier type [2–7]. The Frenkel exciton is an electrically neutral, electronically excited mobile state of a crystal, and it is the collective counterpart of the isolated excited molecule. The Wannier exciton is an electrically neutral, mobile electronic state of a crystal, and it is based on the correlated hole-electron pair [eh]. The spatial extent of the hole-electron pair can vary from near-neighbors (charge-transfer or CT exciton) to those of large-radius [8]. The first experimental evidence for the existence of an excitonic ion in an organic crystal was presented by Arnold, Pope and Hsieh [9]. These authors were looking into the suggestion of Pope and Kallman [10] that earlier experiments of Pope et al [11] could represent the interaction of a free carrier and a free or trapped CT exciton.
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© 1987 Springer Science+Business Media New York
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Pope, M. (1987). Excitonic Ion and Auger Photoemission in Organic Crystals. In: Austin, R., et al. Protein Structure. Proceedings in Life Sciences. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-4796-8_22
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DOI: https://doi.org/10.1007/978-1-4612-4796-8_22
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