FREE-EXCITON LUMINESCENCE OF SOLID XENON AND SOLID KRYPTON

With time and spectrally resolved experiments. the luminescence of sol id Xe and solid Kr was re-investigated. It is for the first time that obtained time and spectrally resolved results are consistent with one another, For solid Xe, the luminescence of free excitons turns out to be extremely strong, exceeding the emission of self-trapped excitons b y a factor of 50 (peak-to-peak ratio). For the first time, an experime ntal determination of self-trapping rates without any assumption conce rning radiative lifetimes was possible. The numerical values in the lo w 10(8) s-1 range are about 4 orders of magnitude smaller than origina lly estimated. The present values are in good agreement with theoretic al predictions.