Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9586173 | Journal of Luminescence | 2005 | 4 Pages |
Abstract
We propose a non-resonant two-photon absorption as a method to create a high-density gas of para-excitons uniformly distributed in a whole volume of a crystal. In non-linear pump-probe experiments we measure changes of the IR absorption induced by the presence of optically excited para-excitons. This way, we directly determine the energy of the para-excitonic 1sâ2p transition at 129Â meV. On the basis of temporal evolution of the induced absorption signal we find the lifetime of the para-excitons to be of the order of 10Â ms.
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Physical and Theoretical Chemistry
Authors
K. Karpinska, P.H.M. van Loosdrecht, I.P. Handayani, A. Revcolevschi,