Energy pooling in the Na-Rb vapor mixture has been investigated.While some kind of buffer gas is introduced into the cell the peculiar features appear.The buffer gas enhances the energy transfer betwwen Na(3P) and Rb(5S),which can be detected through the effects induced on the highly excited states populated by the Na(3P)/Rb(5P) and Rb(5P)/Rb(5P) collisions.

Nuclear Science and TechniquesJan 1, 19960 citations

Bulletin of the American Physical Society

Fine Structure Excitation Transfer in Rb-Buffer Gas Mixtures

Jeremiah Wells, Alina Gearba, Randy Knize, Jerry Sell

Published Oct 21, 2016• 0 citations

OpenAlex

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We have examined fine-structure mixing between the rubidium

5\phantom{\rule{0.16em}{0ex}}^{2}P_{3/2}

and

5\phantom{\rule{0.16em}{0ex}}^{2}P_{1/2}

states along with quenching of these states due to collisions with methane gas. Measurements are carried out using ultrafast laser-pulse excitation to populate one of the Rb

5{\phantom{\rule{0.16em}{0ex}}}^{2}P

states, with the fluorescence produced through collisional excitation transfer observed using time-correlated single-photon counting. Fine-structure mixing rates and quenching rates are determined by the time dependence of this fluorescence. As

\mathrm{Rb}(5\phantom{\rule{0.16em}{0ex}}^{2}P

) collisional excitation transfer is relatively fast in methane gas, measurements were performed at methane pressures of

2.5--25

Torr, resulting in a collisional transfer cross section ($5\phantom{\rule{0.16em}{0ex}}^{2}P_{3/2}\ensuremath{\rightarrow}5\phantom{\rule{0.16em}{0ex}}^{2}P_{1/2}$) of $(4.23\ifmmode\pm\else\textpm\fi{}0.13)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}15}\phantom{\rule{4pt}{0ex}}{\mathrm{cm}}^{2}$. Quenching rates were found to be much slower and were performed over methane pressures of

50--4000

Torr, resulting in a quenching cross section of $(7.52\ifmmode\pm\else\textpm\fi{}0.10)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}19}\phantom{\rule{4pt}{0ex}}{\mathrm{cm}}^{2}$. These results represent a significant increase in precision compared to previous work, and also resolve a discrepancy in previous quenching measurements.