Étude de la diffusion multiple cohérente de la lumière de résonance optique. Application au niveau 6 3P1 du mercure, III. Résultats expérimentaux

Abstract

Les résultats de la théorie développée dans deux publications précédentes ont été vérifiés expérimentalement dans le cas de la diffusion multiple des photons de la raie 2 537 Å (6 1S0 — 6 3P1) par les atomes de mercure. En particulier, le taux de polarisation de la lumière de résonance optiqùe et la durée de vie apparente ou durée de cohérence du niveau 6 3P1 ont été mesurés, dans le cas de l'excitation sélective d'un isotope pair ou de l'un des niveaux hyperfins des isotopes impairs, en fonction du nombre d'atomes par cm3 diffusant le rayonnement, pour des conditions géométriques déterminées. L'influence des conditions géométriques a été également étudiée, ainsi que la largeur et la forme des raies de résonance magnétique dans le cas de la diffusion double. Les résultats expérimentaux sont en général en bon accord avec les prévisions théoriques

Tensor polarizabilities of levels of the configurations 4f 13 6s6p and 4f 12 5d6s 2 in thulium I

“…This figure shows the Hanle-signal (Zerofield crossing) [17] in the absence of an electric field and the superpositions of the "foldover"-crossings in combined electric and magnetic fields for two different electric field strengths. In order to check the influence of line narrowing or broadening due to coherent scattering or collisions [18,19], respectively, the Hanle-effect measurements were made in each line for different densities of the atomic beam. No systematic changes could be observed, if the density was varied by a factor of 5 to 10.…”

Theoretical treatment of resonance radiation imprisonment: new approach to Holstein's equation

“…In order to get a complete description of the resonance radiation, it is true that Holstein's method encounters insoluble obstacles in getting all the eigenfunctions, but it seems similarly impossible to calculate all the Nj's, either. For Holstein's approach it could be accomplished to obtain the first or several first leading terms, but in this case it just applies to the late time; for our solution (14) and (15) the acquirement of several first leading terms is also not difficult, but consequently it is valid merely for the early time. Such being the case it seems that the conclusion could be drawn that this representation and that of Holstein are two that make up for each other's defects.…”

Magnetic Resonance in Radiating or Absorbing Atoms

“…This can be accounted for by considering the interaction of the atoms with the electromagnetic field. The many papers dealing with this subject are summarized by Barrat 40 who succeeds in developing a theory in spite of the inherent complexity of the problem. It is not surprising that such effects exist, or that imprisonment produces a narrowing of the resonance levels, but it is both surprising and gratifying to find that explicit theoretically-based formulations are possible.…”