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Journal of Physics B Atomic Molecular and Optical Physics

Resonance 2s-2p excitation of lithium in the Li + Cd system

Davorka Azinović, Slobodan Milošević, Goran Pichler

Published Jun 25, 2001• 2 citations
Publisher

Abstract

Using the resonance 2s-2p excitation of the Li atom in a lithium-cadmium vapour mixture we observed cadmium atoms excited to very high energy levels such as 6s 3 S 1 , 5d 3 D J and 6p 1 P 1 . As the main excitation process we propose radiative collisions between excited lithium and ground state cadmium atoms followed by an energy-pooling collision between Cd( 3 P J ) atoms. The temporal evolution of intensities of selected lithium and cadmium atomic lines is simulated using a system of rate equations. We estimated the rate coefficient for the radiative collision Li(2p) + Cd(5 1 S 0 ) + h ν 670.8 nm + Δ E →Li(2s) + Cd(5 3 P 0 ), to be 6×10 -10 cm 3 s -1 at T = 965 K.

DOI
10.1088/0953-4075/34/13/313

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Using resonance excitation of the lithium 2p atomic level in a lithium-cadmium vapor mixture we observed cadmium atomic transitions from very high levels. Time dependent fluorescence intensity from various lithium and cadmium atomic levels is measured. Solving a system of 11 rate equations simulates the time evolutions of corresponding atom densities in the lithium and cadmium atomic energy levels. From the best fit we estimate rate coefficient for radiative collision Li(2p)+Cd(51S0)+hν670.8 forming Li(2s)+Cd(53P0).
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Energy pooling collisions of two cadmium atoms in the state 5s5p3P15s5p{}^{3}{P}_{1}5s5p3P1​ have been investigated under pulsed laser excitation and cross sections have been measured for the production of atoms in the 5s5d3DJ5s5d{}^{3}{D}_{J}5s5d3DJ​ states. We have obtained the values $(1.3\ifmmode\pm\else\textpm\fi{}0.6)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}16}$, $(1.1\ifmmode\pm\else\textpm\fi{}0.5)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}16}$, and $(0.7\ifmmode\pm\else\textpm\fi{}0.4)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}16}$ cm2{}^{2}2 for J=1,2,3J=1,2,3J=1,2,3, respectively. The effects of the radiation trapping phenomenon, important both in the cross-section determination and in the evaluation of the Cd atom density in the sealed cell used in the experiment, have been taken into account through numerical solutions of the radiation diffusion equation in the specific conditions of our experiment.