Abstract
Infrared transitions of excitons in Cu 2 O from the 1s to 2p levels have been investigated with a pump-probe experiment. 1s densities around 10 15 /cm 3 have been created by pumping with a cw-laser and the induced 1s M 2p absorption has been probed simultaneously. The main experimental finding is that there is a splitting of , 3.7 v meV in the 2p level scheme, which has not been reported so far. Analyzing the linewidth and shape of the transitions, we find that the effective mass of the 1s state might have been overestimated in earlier studies.
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