Measurement of hyperfine coupling constants in the 3dt2Dj levels of K39, K40, and K41 by polarization quantum-beat spectroscopy

A. Sieradzan, R. Stoleru, Wo Yei, and M. D. Havey
Phys. Rev. A 55, 3475 – Published 1 May 1997
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Abstract

Hyperfine quantum-beat spectroscopy has been utilized in a pump-probe configuration to measure magnetic dipole (A) and electric quadrupole (B) coupling constants in the 3d2D3/2 and 3d2D5/2 levels of three isotopes of potassium. For many of these levels, the largest hyperfine splitting is smaller than the natural width, and so a subnatural linewidth technique is required. In the experiments, the 3d levels are excited on the 4d2S1/2→3d2Dj quadrupole transition with linearly polarized light. Time evolution of the alignment components in the d levels is probed by time-delayed resonant radiation on the 3d2Dj→9p2Pj transitions. Comparison of the excitation rate for two orthogonal relative polarization directions of the pump and probe laser at each delay time permits derivation of a linear polarization degree. This quantity contains beats at the various hyperfine frequencies in the d levels. Fitting the experimentally obtained time dependence to theoretical expressions allows extraction of the hyperfine coupling constants. For the 3d2D3/2 level of K40 we obtain A=0.96(4) MHz and B=0.37(8) MHz, indicating a typical precision also obtained for the other levels and isotopes.

  • Received 21 October 1996

DOI:https://doi.org/10.1103/PhysRevA.55.3475

©1997 American Physical Society

Authors & Affiliations

A. Sieradzan, R. Stoleru, and Wo Yei

  • Physics Department, Central Michigan University, Mount Pleasant, Michigan 48859

M. D. Havey

  • Physics Department, Old Dominion University, Norfolk, Virginia 23529

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Vol. 55, Iss. 5 — May 1997

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