Abstract
A level-crossing effect in stimulated emission is used to determine precisely the hfs in an excited electronic state of . The effect arises from a resonant change in nonlinear polarization induced by a monochromatic field as appropriate tunable level pairs are made to cross.
- Received 7 January 1969
DOI:https://doi.org/10.1103/PhysRevLett.22.267
©1969 American Physical Society