Abstract
This Letter presents for the first time a detailed two-photon spectrum of the even-parity excitons of the yellow series in O. Contrary to one-photon data, it is possible to measure directly and exciton contributions without applying external perturbations. The two-photon spectrum gives evidence for a strong mixing between the yellow and the green series which is explained by exchange interaction and nondiagonal parts in the effective-mass Hamiltonian.
- Received 9 August 1979
DOI:https://doi.org/10.1103/PhysRevLett.43.1260
©1979 American Physical Society