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Canadian Journal of Physics

Article

Maurizio E. Musso, F. Fuso, G. De Filippo, M. Allegrini, Dieter Gruber, Laurentius Windholz

Published Oct 1, 1998• 0 citations
Publisher

Abstract

Transfer of excitation from cadmium to sodium atoms was investigated in anheat pipe oven illuminated by a pulsed laser tuned on the intercombinationtransition of cadmium. A rich emission spectrum with cadmium as well assodium lines was observed. Intramultiplet mixing distributes the initialexcited level population 5p3P1 to the nearby fine structurelevels 5p3P0,2 of the same multiplet. We have experimentalevidence that the energy transfer pathway is from Cd (5p3PJ) to Na(4p2PJ) which is collisionally rapidly converted toNa(3d2DJ), from which the strongest emission was observed.PACS No.: 34.90+q

DOI
10.1139/p98-047

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Transfer of excitation from cadmium to sodium atoms was investigated in anheat pipe oven illuminated by a pulsed laser tuned on the intercombinationtransition of cadmium. A rich emission spectrum with cadmium as well assodium lines was observed. Intramultiplet mixing distributes the initialexcited level population 5p3P1 to the nearby fine structurelevels 5p3P0,2 of the same multiplet. We have experimentalevidence that the energy transfer pathway is from Cd (5p3PJ) to Na(4p2PJ) which is collisionally rapidly converted toNa(3d2DJ), from which the strongest emission was observed.PACS No.: 34.90+q
Transfer of excitation from cadmium to sodium atoms was investigated in an heat pipe oven illuminated by a pulsed laser tuned on the intercombination transition of cadmium. A rich emission spectrum with cadmium as well as sodium lines was observed. Intramultiplet mixing distributes the initial excited level population 5p(3)P(1) to the nearby fine structure levels 5p(3)P(0,2) of the same multiplet. We have experimental evidence that the energy transfer pathway is from Cd (5p(3)P(J)) to Na(4p(2)P(J)) which is collisionally rapidly converted to Na(3d(2)D(J)), from which the strongest emission was observed.
Collisional transfer of excitation energy from cadmium to caesium was investigated using methods of sensitized fluorescence. A mixture of cadmium and caesium vapors at low pressure was irradiated with Cd 3263.0 Å resonance radiation producing a population of Cd (53P1) atoms whose inelastic collisions with ground-state Cs atoms resulted in a transfer of excitation energy to a close-lying S, P, D and F states in caesium. The subsequent decay of these states manifested itself in the emission of sensitized fluorescence spectrum. Intensity measurements on the components of the spectrum by means of energy calibrated detector yielded some 50 cross-section values whose magnitudes range from 0.2 Å2 to 30.0 Å2 and which exhibit a pronounced resonances with ΔE the energy defect between Cd (53P1) and the appropriate level in caesium.
Collisional energy transfer between atoms and molecules proved to be an efficient method for excitation of new laser lines and spectroscopy of states forbidden for direct excitation or emission by parity conservation [1]. We have studied a number of stimulated emissions in the near IR 800 - 850nm in Na atom via Na2X—A transitions. Two tunable dye lasers have been employed, the first one scanning the X—A molecular transition and the second one tuned to Na 3p-4d single photon resonance, Fig.1. Taking the collision rate coefficient for the reaction
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.
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.