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Physica Scripta

Energy Transfer and Nonlinear Processes in Atoms and Dimers

Stoyan Dinev

Published Jan 1, 1989• 0 citations
Publisher

Abstract

Second harmonic generation and parametric emission in K and Na have been extensively studied. The experimental measurements for the s, p and d states of K ( n = 7-34) and the 5 s state of Na are compared with theoretical models of ionization d.c.-induced field and collisional l -mixing of states. Collisional energy transfer in the wings of Na 3 p and between Na and Na 2 has been used to excite tunable stimulated emission in the range 800-850 nm.

DOI
10.1088/0031-8949/1989/t26/003

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Second harmonic generation and parametric emission in K and Na have been extensively studied. The experimental measurements for the s, p and d states of K ( n = 7-34) and the 5 s state of Na are compared with theoretical models of ionization d.c.-induced field and collisional l -mixing of states. Collisional energy transfer in the wings of Na 3 p and between Na and Na 2 has been used to excite tunable stimulated emission in the range 800-850 nm.
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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
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.