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- W2086978461 abstract "A two-step excitation experiment has been employed to measure the collisional rate coefficients and to study the velocity distribution of $mathrm{Cs}(6{P}_{1∕2})$ atoms that have undergone a single hyperfine state-changing collision with Ar. In addition, argon pressure broadening rates and shifts of the cesium $6{P}_{1∕2}({F}^{ensuremath{'}})ensuremath{rightarrow}8{S}_{1∕2}({F}^{ensuremath{''}})$ transitions have been determined. In the experiment, a single mode, cw Ti:sapphire laser is tuned to line center of the $6{S}_{1∕2}(F=4)ensuremath{rightarrow}6{P}_{1∕2}$(${F}^{ensuremath{'}}=3$ or 4) transition. Then, the frequency of a single mode cw dye laser is scanned over the $6{P}_{1∕2}ensuremath{rightarrow}8{S}_{1∕2}$ manifold to probe the populations of the $6{P}_{1∕2}$ hyperfine levels. Absorption of probe laser photons is monitored by detecting $8{S}_{1∕2}ensuremath{rightarrow}6{P}_{3∕2}$ fluorescence. The experiment is conducted at room temperature, where the Cs density is low $(nensuremath{sim}3.4ifmmodetimeselsetexttimesfi{}{10}^{10}phantom{rule{0.3em}{0ex}}mathrm{atoms}phantom{rule{0.3em}{0ex}}{mathrm{cm}}^{ensuremath{-}3})$, and thus the probability of a $mathrm{Cs}text{ensuremath{-}}mathrm{Cs}$ collision is negligible during the $mathrm{Cs}(6{P}_{1∕2})$ radiative lifetime. The Ar pressure is varied from 0 to $1.52phantom{rule{0.3em}{0ex}}mathrm{Torr}$, and $mathrm{Cs}text{ensuremath{-}}mathrm{Ar}$ collisions cause population to be transferred from the directly excited $6{P}_{1∕2}({F}^{ensuremath{'}})$ level to the other $6{P}_{1∕2}$ hyperfine level. The data are analyzed using a density matrix formalism to yield the rate coefficients for $mathrm{Cs}(6{P}_{1∕2})text{ensuremath{-}}mathrm{Ar}$ hyperfine state-changing collisions. In addition, the one-dimensional velocity changing collision kernel for $mathrm{Cs}(6{P}_{1∕2})$ atoms prepared with ${v}_{z}=0$ that undergo ${F}^{ensuremath{'}}=3ensuremath{leftrightarrow}{F}^{ensuremath{'}}=4$ hyperfine state-changing collisions with argon is reported." @default.
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- W2086978461 date "2008-03-10" @default.
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- W2086978461 title "Hyperfine state-changing collisions ofCs(6P1∕2)atoms with argon perturbers" @default.
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- W2086978461 doi "https://doi.org/10.1103/physreva.77.032704" @default.
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