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Journal of Physics B Atomic Molecular and Optical Physics

Laser-induced collisional energy transfer in a rubidium-sodium mixture: experiment and interpretation in the framework of the non-adiabatic collision theory

Bernard Cheron, Hélène Kucal, D. Hennecart

Published Dec 14, 1990• 7 citations
Publisher

Abstract

The laser-induced collisional energy transfer process: Rb(5 2 P 3 2/)+Na(3 2 S 1 2/)+hv implies Rb(5 2 S 1 2/)+Na(3 2 D 3 2.5/2/), is experimentally investigated. The relative transfer cross section or transfer profile is measured versus the frequency of the photon. The far wing of the transfer profile is well interpreted using the quasi-static approximation. However, it is shown that the central part of the profile is reproduced only by taking into account non-adiabatic mixing between molecular levels during the collision.

DOI
10.1088/0953-4075/23/23/011

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The laser-induced collisional energy transfer process: Rb(5 2 P 3 2/)+Na(3 2 S 1 2/)+hv implies Rb(5 2 S 1 2/)+Na(3 2 D 3 2.5/2/), is experimentally investigated. The relative transfer cross section or transfer profile is measured versus the frequency of the photon. The far wing of the transfer profile is well interpreted using the quasi-static approximation. However, it is shown that the central part of the profile is reproduced only by taking into account non-adiabatic mixing between molecular levels during the collision.
The cross sections for the excitation energy transfer in the collisional processes Na*(3P 1 2/)+M(nS 1 2/) to or from Na*(3p 3 2/)+m(Ns 3 2/), m being ground-state Rb (n=5) or Cs (n=6) atom, have been measured by laser fluorescence method. With either of the two sodium 3P fine-structure states optically excited, the intensity ratio of the sensitized to direct fluorescence was measured. The polarization effects due to partially polarized and anisotropic direct fluorescence were investigated. The measured cross sections (T=530 K) for the sodium 3P fine-structure excitation transfer induced by collisions with Rb are: sigma ( 1 / 2 to 3 / 2 )=170 AA 2 , with an overall accuracy of 20%. The corresponding values in the Cs case are: sigma ( 1 / 2 to 3 / 2 )=140 AA 2 , sigma ( 3 / 2 to 1 / 2 )=83 AA 2 . The theoretical calculations reveal the decisive role of the dipole-quadrupole interaction. The obtained values are in satisfactory agreement with the experiment only if both the dipole-dipole and dipole-quadrupole interactions are taken into account, while the calculations involving the dipole-dipole term alone yield the cross section values which are as much as one order of magnitude lower than the experimentally observed ones.
An experimental study of laser-induced collisional energy transfer in a mixture of europium and strontium vapors is reported. The profile of the excitation spectrum in the static wing has been measured with high accuracy and compared with available calculations, demonstrating that simple two-level models are inadequate to describe the transfer process. A comparison with the predictions of a three-level model assuming dipole-dipole interaction, recently developed by Bambini and Berman, shows for the first time agreement between theory and experiment.
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 .
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