Abstract
1 ! a method of calculating the energy levels of trapped electrons in ionic crystals was developed. This method was based on a many body formulation which included the phonon field, and detailed calculations for the F center were given. The present paper summarizes the results of applying this method to the Jt~ + center in an ionic crystal. The F 2+ center is a system consisting of two negative ion vacancies (an anion vacancy pair) and an electron in an ionic crystal. The energy levels of this center have been calculated by Nagamiya and Tatsuuma,
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