Abstract
Hyperfine structure in three n2D5/2 states (n=11, 12 and 13) of 87Rb was investigated by the quantum-beat method in zero magnetic field. The states of interest were excited by two-photon absorption from a single hyperfine substate (with F=1) of the ground state. The magnetic-dipole interaction constant A and the electric-quadrupole interaction constant B were obtained by analysis of the modulation frequencies of the fluorescence signals (transition n2D5/2-52P3/2). The results (MHz) are as follows: mod A(112D5/2) mod =0.361(7), mod B(112D5/2) mod =0.071(11), mod A(122D5/2) mod =0.266(9), mod B(122D5/2) mod =0.063(14), mod A(132D5/2) mod =0.20(1), mod B(132D5/2) mod =0.05(2). For all the states, A and B differ in sign. The effective lifetimes obtained as a by-product of the experiment are also presented.
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