The temperature dependence of the linewidth of the lowest two r; excitons in Csl and in CsBr and of a very narrow I ? ; exciton in CsI is reported. All spectra are measured by three-photon spectroscopy. The analysis of the experimental results allows conclusions about the decay mechanism of excitons in alkali halides. The temperature dependent broadening is quantitatively described by taking into account exciton-phonon interaction.Die Temperaturabhiingigkeit der Linienbreiten der beiden niederenergetischen r;-Exzitonen in CsI und CsBr und eines sehr schmalen r;-Exzitons in CsI wird untersucht. Alle Spektren werden mit der Methode der Dreiphotonenspektroskopie ausgemessen. Die Auswertung der experimentellen Resultate erlaubt Ruckschliisse auf den Zerfdlsmechanismus der Exzitonen in Alkalihalogeniden.Unter Einbeziehung der Exziton-Phonon-Wechselwirkung kann die temperaturabhiingige Linienverbreiterung quantitativ beschrieben werden.
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