Other
Scientific paper
Sep 1961
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1961rspsa.263..353d&link_type=abstract
Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 263, Issue 1314, pp. 353-370
Other
83
Scientific paper
A theory is formulated to describe the modulation which has been observed in fluorescent light from atoms subjected simultaneously to optical and radio-frequency radiation. The optical field stimulates one or more of a set of excited states of the atom, between which the radio-frequency field establishes coherence. This coherence is manifest in the fluorescent radiation. Interference between radiations of different frequency leads to modulation. General expressions are given for the intensity of the fluorescent light as a function of time. The Zeeman structure of the transition (6^3P_1 - 6^1S_0), λ2537 Å, in mercury is studied in detail. Modulation at frequencies, 1, 2, 3 and 4 times that of the radio-frequency field, ω_0, is predicted, and resonant effects at static magnetic fields, 0, 1/2, 1, 3/2, 2 and 3 times H_0, the field for which ω_0 is the Larmor frequency. Resonances at fields other than H_0 are due to excitation with light of mixed polarization. Most of the predicted effects have been found experimentally. A `frequency diagram' is introduced and discussed, to represent the combined effects of static and radio-frequency magnetic fields. To each excited state belong a set of r frequencies, where r is the number of states linked by the radio-frequency perturbation. The 9 levels are drawn, as functions of H, for the states m_J = 0, ±1, of ^3P_1. The resonances at fields other than H_0 may be associated with intersections of frequency levels belonging to different m_J.
Dodd J. N.
Series G. W.
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