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AIP conference proceedings

Quasiresonant excitation of lithium vapor

Slobodan Milošević

Published Jan 1, 2001• 0 citations
Publisher

Abstract

We performed quasiresonant laser excitation of lithium vapor and lithium-zinc (cadmium) vapor mixture at 460.3 nm and 497.2 nm. Different processes producing initial Li(2p) level population are identified and discussed. In lithium-zinc (cadmium) vapor mixture three-body reactive collision of excited atoms is found responsible for formation of the excited LiZn or LiCd dimers.

DOI
10.1063/1.1370677

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We performed quasiresonant laser excitation of lithium vapor and lithium-zinc (cadmium) vapor mixture at 460.3 nm and 497.2 nm. Different processes producing initial Li(2p) level population are identified and discussed. In lithium-zinc (cadmium) vapor mixture three-body reactive collision of excited atoms is found responsible for formation of the excited LiZn or LiCd dimers.
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
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.
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).
The photoassociation and bound-bound excitation processes of alkali-metal--group-IIB molecules have been studied for the LiZn, LiCd, and NaZn molecules. We considered two main factors relevant to these processes, namely, the densities of collision complexes and the relevant absorption coefficients. Densities in the vapor mixture were manipulated by preparation of different metal alloys, whereas the free-bound or bound-bound absorption is selected by changing a laser wavelength used for the excitation. The 22{\mathrm{}}^{2}2\ensuremath{\Pi} states were directly excited by the laser wavelength in the spectral range 435--450 nm. The densities of the LiZn, LiCd, and NaZn excimers were estimated from alkali-metal and Zn (Cd) densities using the dissociation equilibrium equation for the corresponding excimers in the ground state. The experimentally observed LiZn excimer band at 477 nm was satisfactory compared with the appropriate theoretical simulation, assuming free-bound excitation of the 22{\mathrm{}}^{2}2\ensuremath{\Pi} state at 438.5 nm. \textcopyright{} 1996 The American Physical Society.