A series of measurements of the line shape of the fluorine resonance versus magnetic field have been made using a molecular-beam apparatus. Good theoretical agreement has been found for RbF. The CsF behavior is complicated by the overlapping Cs spectrum. The equivalent field at the fluorine nucleus per unit molecular rotation, $H_r$, is found to be 2.28±0.20 gauss and 3.00±0.15 gauss for RbF and CsF respectively. These results are less than those previously measured.

• Received 7 October 1954

DOI:https://doi.org/10.1103/PhysRev.98.470