VII. NUCLEAR MAGNETIC RESONANCE AND HYPERFINE STRUCTURE

There are four main objectives in the work of this group: first, the investigation of molecular and solid-state problems by nuclear magnetic-resonance techniques; second, the investigation of the structure of atomic nuclei, particularly of radioactive nuclei, by nuclear magnetic-resonance techniques and by the investigation of atomic hyperfine-structure and isotope shift; third, the development of atomic resonance techniques for the study of resonance radiation; and fourth, the study of the earth ' s magnetosphere. 1. Nuclear Magnetic Resonance Our molecular studies by means of nuclear resonance continue to emphasize: (a) the nature of phase transitions, particularly those involving order-disorder phenomena, in solids; (b) intermolecular forces, including their reflection in the transport properties of fluids; and (c) determination of the structures of simple molecules. J. S. Waugh 2. Hyperfine Structure Optical pumping and nuclear resonance have been used successfully to achieve new results. The results of our isotope-shift experiments have clarified the causes of th