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AIP conference proceedings

Resonance excitation of lithium and radiative collision in Li+Cd system

Davorka Azinović

Published Jan 1, 2001• 0 citations
Publisher

Abstract

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).

DOI
10.1063/1.1370676

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Canadian Journal of Physics•Nov 15, 1974•12 citations
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).
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).
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.
We performed quasiresonant laser excitation of Li–Cd vapor mixtures at 460.3 nm (2p–4d) and 497.2 nm (2p–4s). The initial population of the Li(2p) level is caused by three processes: collisional dissociation or photodissociation of the Li 2 (B 1 Π u ) molecules or energy transfer in Li 2 (B 1 Π u ) and Li(2s) collisions. The Li(4d,4s) atoms radiatively decay towards Li(3p), from which collisional population transfer to Cd(5 3 P J ) occurs, followed by three-body reactive collisions which produce the LiCd(2 2 Π ) excimer states
The transfer of excitation energy induced in inelastic collisions between excited Hg atoms and ground-state Cd atoms was studied using methods of sensitized fluorescence. Hg atoms in a low-density Hg–Cd vapor mixture were excited with Hg 2537 Å resonance radiation to the 63P1 state and interacted with the Cd atoms which became collisionally excited to the 53P1 state and subsequently decayed emitting sensitized fluorescence. Measurements of relative intensities of Hg 2537 Å resonance fluorescence and Cd 3261 Å sensitized fluorescence yielded the cross section Q(63P1 → 53P1) = 4.6 × 10−2 Å2. The efficiency of the excitation transfer was enhanced by the addition of small quantities of N2 to the Hg–Cd system. The cross section for quenching of the Cd 53P1 state by collisions with N2 was found to be 1.7 Å2.