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Etude théorique et expérimentale des atomes de Rydberg circulaires: vers une mesure directe de la constante de Rydberg en unités de fréquence

Abstract : Circular Rydberg states of atoms have very peculiar properties which are studied in details in this thesis. In part I, these states are described in the framework of the semi classical theory as well as in the usual point of view of Quantum mechanics. The dynamical symmetries of hydrogenic systems are systematically exploited, since they allow us to understand clearly how these states can be prepared and preserved against various perturbations in a laboratory surrounding. In part II, experiments we have performed on circular states of lithium in view of a precise measurement of the Rydberg constant R are reported. We describe in particular a novel metthod for preparing these states, known as "the crossed fields" technique. We also analyse microwave spectroscopy experiments measuring the transition frequencies between adjacing circular states. We describe experiments performed with pulsed and continuous excitation, the latter being for various reasons more promising for the measurement of R. In part III, we present a detailed calculation of transition frequencies between circular states of lithium. Starting from the Bohr model, we take into account the effect of various small perturbations, internal as well as external and estimate them with a precision corresponding to eleven significant digits. The ordering of these perturbations is unusual, since the effect of external electric or magnetic fields is larger than the internal couplings (magnetic, relativistic, interaction of valence electron with the atomic core). The result of this calculation shows that a very precise measurement of R based on the detection of the microwave spectrum of circular Rydberg atoms of Lithium is possible.
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  • HAL Id : tel-00011877, version 1

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Jean Hare. Etude théorique et expérimentale des atomes de Rydberg circulaires: vers une mesure directe de la constante de Rydberg en unités de fréquence. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 1991. Français. ⟨tel-00011877⟩

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