At about 850℃ on common glass welded cuprous oxide crystal sample is under more than 10kg/mm2 plane compressive stress at 77°K. We have investigated systematically the splittings and intensities of the strong reflection lines of the pale-blue and blue exciton line series in some samples with plane stress perpendicular to C4, C3, and C2 symmetry axes of the crystal respectively. If it is assumed, as by E. F. Gross and colleagues, that these series are relative to Γ7+-Γ8- and Γ8+-Γ8- band edge transitions, the present experimental facts can be interpreted satisfactorilly. The effects of the same stress on the yellow and green hydrogenic exciton line series of this crystal are investigated also. For the cases of plane stress perpendicular to C4, C3, and C2 symmetry axes respectively, the shift of each line of these series are determined, the results show that the effect of the stress on the Rydberg constant and the series limit of the green series is large than that of the yellow series.
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