Measurement of Rb Excited States

Jerry Sell, Brian M. Patterson, Alina Gearba +5 more

P. M. Rupasinghe, Fiona Wee, Thomas Bullock +1 more

Abstract The Saturated Absorption Spectroscopy (SAS) was performed to measure the hyperfine constants of rubidium 5P1/2 excited state using an external-cavity diode laser (ECDL) operating at 795 nm. We report our measurements for the magnetic dipole coupling constants 120.79(29) and 407.75(57) for 85 Rb and 87 Rb respectively. Our measurement of the 85 Rb hyperfine constant shows a good agreement with previous results and our measurement of the 87 Rb hyperfine constant resolves the discrepancy of results that exists in the literature.

Sun Xian-ping, Hu Z, Zeng Xi-zhi +2 more

The processes of excitation transfer from the 82S1/2 state to the 62D state of rubidium in Rb(82S1/2) – Rb(52S1/2) and Rb(82S1/2) – H2 collisions have been studied experimentally. During irradiating the Rb vapor, mixed with H2, by two light beams for selective stepwise excitation, the Rb 82S1/2 → 52P3/2 direct fluorescence and the Rb 62D3/2 → 52P1/2 sensitized fluorescence have been measured as a function of H2 gas pressure. The measurements yielded the cross-sections σ(82S1/2 → 62D) and σ*(82S1/2 → 62D) of Rb 82S1/2 → 62D excitation transfer induced by collisions with 52S1/2 Rb atom and H2 molecules respectively. The results are discussed in detail.

H. T. Duong, Sylvain Liberman, Jacques Pinard

Yifan Shen

Rb atoms were excited to the 5P3/2 level using a single-mode laser diode. The 5P3/2 state atom density was measured by the absorption of line from a Rb hollow-cathode lamp. The excited atom density is combined with measured fluorescence ratio to determine collisional cross section for the energy pooling process [i.e. Rb(5P3/2)+Rb(5P3/2)→Rb(5D)+Rb(5S)]. The cross section is (5.0±1.9)(?)10-14cm2. Cross section for 5P3/2 →5P1/2 transfer in Rb, induced in collision with ground-state Rb atoms, has been determined using methods of atomic fluorescence. The resulting fluorescence included a direct component arising from the optically excited state and a sensitized component due to the collisionally populated fine-structure state and the energy-pooling collisions. Measurement of relative intensities of the two components yielded the following cross section: σ(5P3/2→5P1/2)=(3.0±0.9)×10-15cm2. It is found that the rate for the energy pooling is an order of magnitude more efficient than 5P3/2→5P1/2 mixture. Comparisons of our result with other experiments have been made.

Angelo A. Lamola, William R. Ware