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Chinese Physics Letters

Determination of fine structure transition cross sections of Rb(7 2 D ) atoms induced by collisions with molecules of H 2 or CO

Sun Xian-ping, Liu Zidong, Senlin Li

Published Dec 1, 1990• 0 citations
Publisher

Abstract

The cross sections for fine-structure transition (FST) of Rb(7 2 D ) atoms induced by collision with molecules of H 2 and CO have been experimentally determined by the method of selective stepwise excitation of Rb atoms and observation of the resulting fluorescence. The cross sections (in units of 10 -14 cm 2 ) for Rb(7 2 D )-H 2 are σ fs *(7 2 D 5/2 → 7 2 D 3/2 ) = 0.16 ± 0.03, σ fs *'(7 2 D 3/2 → 7 2 D 5/2 ) = 0.24 ± 0.05, for Rb(7 2 D )-CO: σ fs * = 0.10 ± 0.06 and σ fs * ' = 0.15 ± 0.09. The cross sections σ tr * for transfer out of the 7 2 D doublet were also determined.

DOI
10.1088/0256-307x/7/12/004

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Journal of Physics B Atomic Molecular and Optical Physics•Mar 28, 1992•9 citations
The cross sections for fine-structure transition (FST) of Rb(7 2 D ) atoms induced by collision with molecules of H 2 and CO have been experimentally determined by the method of selective stepwise excitation of Rb atoms and observation of the resulting fluorescence. The cross sections (in units of 10 -14 cm 2 ) for Rb(7 2 D )-H 2 are σ fs *(7 2 D 5/2 → 7 2 D 3/2 ) = 0.16 ± 0.03, σ fs *'(7 2 D 3/2 → 7 2 D 5/2 ) = 0.24 ± 0.05, for Rb(7 2 D )-CO: σ fs * = 0.10 ± 0.06 and σ fs * ' = 0.15 ± 0.09. The cross sections σ tr * for transfer out of the 7 2 D doublet were also determined.
In a vapor cell, the relative intensities of a sensitized fluorescence I3/21 and a direct fluorescence I3/22, as a function of T (100 to 200℃), had been measured by the methods of selective stepwise excitations with a Rb lamp and a tunable CW dye laser. From these measurements, the fine-structure transition cross-section in the 7 2D states of Rb induced in collidsion with ground-state Rb atoms were determined to be σfs (7 2D5/2→72D3/2) = 4.7 × 10-13 cm2 and σfs1 (7 2D3/2→7 2D5/2) = 7.0 × 10-13cm2 and the cross-section for transfer of excited Rb 7 2D-state atoms out of the doublet were also determined as σtr(5/2) (7 2D5/2→states other than Rb 7 2D) = 0.62 × 10-13 cm2. The calculcted result for the geometrical cross-section of excited Rb 7 2D state shows that the magnitunes of σfs and σfs1 can be described relatively well by σgeom.
Cross sections for 72D{7}^{2}D72D and 82D{8}^{2}D82D fine-structure mixing in Rb, induced by collisions with various ground-state atoms and N2{\mathrm{N}}_{2}N2​ molecules, have been determined using methods of atomic fluorescence. Rb vapor, pure or mixed with a buffer gas, was irradiated in a glass fluorescence cell with pulses of radiation from a N2{\mathrm{N}}_{2}N2​ laser-pumped dye laser, populating a 2D^{2}D2D fine-structure state by two-photon absorption. 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. Measurements of relative intensities of the two components in relation to buffer-gas pressure yielded the following cross sections (in units of ${10}^{\ensuremath{-}14}$ cm2{\mathrm{cm}}^{2}cm2): $Q({7}^{2}{D}_{\frac{3}{2}}\ensuremath{\rightarrow}{7}^{2}{D}_{\frac{5}{2}})=14.1,15.5,\mathrm{and}10.0$; $Q({7}^{2}{D}_{\frac{3}{2}}\ensuremath{\leftarrow}{7}^{2}{D}_{\frac{5}{2}})=9.0,10.5,\mathrm{and}6.9$, for Kr, Xe, and N2{\mathrm{N}}_{2}N2​, respectively; $Q({8}^{2}{D}_{\frac{3}{2}}\ensuremath{\rightarrow}{8}^{2}{D}_{\frac{5}{2}})=8.9,4.9,12.4,24.9,25.8,12.1,\mathrm{and}43.1$; $Q({8}^{2}{D}_{\frac{3}{2}}\ensuremath{\leftarrow}{8}^{2}{D}_{\frac{5}{2}})=5.8,3.2,9.4,15.1,17.6,8.3,\mathrm{and}28.5$, for He, Ne, Ar, Kr, Xe, N2{\mathrm{N}}_{2}N2​, and Rb, respectively. Cross sections for the effective depopulation of the 2D^{2}D2D states were also determined.
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.
Inelastic collisional processes in fine-structure-state mixing have been studied by selective stepwise excitation and observation of the resulting fluorescence during collisions of excited rubidium 62D526^{2}D_{\frac{5}{2}}62D25​​ state atoms with various noble-gas atoms. It is shown that for intermediately excited rubidium atoms the fine-structure-state mixing cross sections are generally increasing from helium to xexon. The cross sections for the process $\mathrm{Rb}(6^{2}D_{\frac{5}{2}})+A(n^{1}S_{0})\ensuremath{\rightarrow}\mathrm{Rb}(6^{2}D_{\frac{3}{2}})+A(n^{1}S_{0})+\ensuremath{\Delta}E$ have the values ${\ensuremath{\sigma}}_{\mathrm{fs}}^{*}=2.4\ifmmode\pm\else\textpm\fi{}0.9, 3.1\ifmmode\pm\else\textpm\fi{}1.2, 2.6\ifmmode\pm\else\textpm\fi{}1.0, 5.8\ifmmode\pm\else\textpm\fi{}2.2, \mathrm{and} 9.3\ifmmode\pm\else\textpm\fi{}5.6$ in units of ${10}^{\ensuremath{-}14}$ cm2{\mathrm{cm}}^{2}cm2, where AAA denotes in sequence any one of the noble gas atoms He, Ne, Ar, Kr, and Xe, respectively. Transfer cross sections for the transfer of excited Rb62D6^{2}D62D-state atoms out of the doublet were also determined and are about an order of magnitude smaller than the fine-structure-mixing cross sections.
A diode-laser fluorescence experiment was performed in order to study fine-structure transitions between 5 2 P states of rubidium atoms colliding with ground-state potassium or caesium atoms. The Rb (5 2 P 3 2/) state was optically excited and the intensity ratio of sensitized to direct fluorescence was measured. The obtained cross sections for the excitation energy transfer Rb( 2 P 3 2/) to Rb( 2 P 1 2/) induced by collisions with K and Cs (T=573 K) are sigma =54 AA 2 +or-30% and sigma =15 AA 2 +or-30%, respectively. Assuming detailed balancing, the cross sections for the reverse process Rb( 2 P 1 2/) to Rb( 2 P 3 2/) are sigma =60 AA 2 +or-30%, and sigma =16.5 AA 2 +or-30% for K and Cs, respectively.