Abstract
The relative optical absorption coefficient of polycrystalline slabs of cuprous oxide was measured at 295°K, 77°K, and 4.2°K. At 4.2°K, is proportional to for , where is the wave number. At 77°K an additional component appears, so that , with and . This is attributed to indirect transitions to exciton levels, in agreement with a theory by Elliott. The ratio of the integrated absorption coefficient of the first two exciton lines, after corrections for the background were applied, is also in satisfactory agreement with the Elliott theory.
- Received 19 July 1960
DOI:https://doi.org/10.1103/PhysRev.121.359
©1961 American Physical Society