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Canadian Journal of Physics

Observation of collisional energy transfer from laser excited Cd atoms to Na(4p 2PJ) atoms

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

Published Jan 1, 1998• 1 citation
Publisher

Abstract

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.

DOI
10.1139/cjp-76-10-759

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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.
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
Abstract. The cross sections for the Na.4D/! Na.4F / excitation energy transfer induced by collisions with He, Ar and Na ground-state atoms have been measured. The sodium atoms in the 4D state have been produced by two-photon excitation using cw laser radiation at 578.89 nm. Within a model which takes into account collisional population and depopulation of the 4F level as well as radiative relaxation (direct or cascade) of the 3D, 4P, 4D and 4F states ending in the 3P level, the rate for the Na.4D / ! Na.4F / collisional transfer turns out to be related to the ratio of the steady-state populations created in 3D and 4D states. They have been determined by measuring the fluorescence intensities of the 3D! 3P and 4D! 3P transitions. The measurements yield the following cross section values for those
The cross sections for the excitation energy transfer induced by collisions with He, Ar and Na ground-state atoms have been measured. The sodium atoms in the 4D state have been produced by two-photon excitation using cw laser radiation at 578.89 nm. Within a model which takes into account collisional population and depopulation of the 4F level as well as radiative relaxation (direct or cascade) of the 3D, 4P, 4D and 4F states ending in the 3P level, the rate for the collisional transfer turns out to be related to the ratio of the steady-state populations created in 3D and 4D states. They have been determined by measuring the fluorescence intensities of the and transitions. The measurements yield the following cross section values for those processes investigated: , and , at .
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