Optical methods for the study of radio‐frequency resonances

SEP 01, 1967

The double resonance method and optical pumping technique have led to advances in the study of nuclear spins and magnetic moments, electron magnetic moments, multiple‐quantum transitions, and nuclear hyperfine interactions. Excitation by electron impact has permitted the study of atomic levels not accessible with resonance radiation.

DOI: 10.1063/1.3034481

Alfred Kastler

DURING MY FIRST YEAR as a student at the Ecole Normale Supérieure in Paris, our professor, Eugene Bloch, introduced us to quantum physics, which was seldom taught in France at that time. Like him, I was from Alsace and spoke German. He strongly advised me to read Arnold Sommerfeld’s excellent book Atombau und Spektrallinien. When reading this book, I was particularly interested in the application of the principle of conservation of angular momentum in interactions between electromagnetic radiation and matter—an application that guided A. Rubinowicz to the interpretation of the selection rules for the angular momentum quantum number and for polarization in the Zeeman effect. On the assumption of light quanta, this principle led to attributing an angular momentum to the photons $+h/2π$ or $−h/2π,$ according to whether the light was circularly polarized to the right ${(σ}^{+})$ or to the left ${(σ}^{-}),$ natural light being a mixture of the two types of photon.

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See also: A Kastler in Lasers and Applications (W.S.C. Chang, ed.) Ohio State University, Columbus (1963).

More about the Authors

Alfred Kastler. Ecole Normale Superieure.