Abstract
For Rb87 the level crossing method was applied to the first four levels (n = 5, 6, 7, and 8) of the np2P3/2 series in the Rb I spectrum. By using magnetic dipole interaction constants from corresponding zero field optical double resonance experiments, the electronic gJ factors of 5, 6, and 7p2P3/2 were calculated from the level crossing data. For these levels the natural radiative lifetimes were determined from the half-widths of the level crossing signals. For 8p2P3/2 the a factor was obtained assuming gJ = -1.336 (2). From the measured electric quadrupole interaction constants b, decreasing values of the nuclear quadrupole moment Q were obtained in 5, 6, 7, and 8p2P3/2. When core polarization effects are taken into account, the different 2P3/2 levels yield consistent values for the quadrupole moment. We find
| gJ(5p2P3/2) = -1.3362 (6) | gJ(6p2P3/2) = -1.3347 (10) |
| τ (5p2P3/2) = 25.8 (8) ns | τ (6p2P3/2) = 111 (3) ns |
| b (5p2P3/2) = 12.510 (57) MHz | b (6p2P3/2) = 3.947 (13) MHz |
| Q(5p2P3/2) = 0.131 barn | Q(6p2P3/2) = 0.133 barn |
| gJ(7p2P3/2) = -1.3359 (11) | a(8p2P3/2) = 6.747 (14) MHz |
| τ (7p2P3/2) = 233 (10) ns | b (8p2P3/2) = 0.933 (20) MHz |
| b (7p2P3/2) = 1.768 (8) MHz | Q(8p2P3/2) = 0.131 barn |
| Q(7p2P3/2) = 0.133 barn |
Considering possible sources of error in the evaluation of the quadrupole moment we obtain Q(Rb87) = +0.132 (9) barn.
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