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CORRELATIONS ELECTRONIQUES DES ETATS DOUBLE-RYDBERG DU BARYUM : CONTRIBUTIONS EXPERIMENTALES ET THEORIQUES

Abstract : The study focuses on the double-Rydberg Nl1 n'l2 states of barium such that one electron is much more excited than the other. The production of such states is achieved by sequential laser excitation of the isolated core via the 6s nl2 (n - n') relay level. The detection consists in analyzing the excited Ba+ ions, self-ionization products of the Ni1 nl2 states, either directly or after selective ionization in Ba++ (photoionization or ionization by microwave field). The ions are analyzed by a time-of-flight spectrometry technique. In a first part, we study the self-ionizing series 7p1/2n'd and 7P3/2n'd and the double-Rydberg 9dnl series (l=s, p, d) whose properties are interpreted with an independent electron model based on the quantum defect theory and the approximation of the isolated core. In a second part, the study of the highly excited double-Rydberg series Nl1 n'l2 withN-25 ( n'-40 and 12=p or d) shows the evolution from situations where there is no correlation effect to those where the correlation is clearly demonstrated (N>0.5n'). The effects are interpreted by taking into account the polarization of the core excites Nl1 by the field created by the external electron n'l2. The theoretical model is based on a Born-Oppenheimer approach which generalizes the approximation of the isolated heart. This study allows us to analyze the limit of the excitation of the isolated heart set for N>(3n'^4/8)^(1/5). In the last part we study the doubly excited states of large orbital angular momentum 6pjnl (j=1/2, 3/2) and 6djnl (j=3/2, 5/2) or l=n-1 , n-2, ... Their low self-ionization rate has allowed to highlight the effect of the j1I2 type coupling between the two electrons. The experimental results are interpreted from the independent electron model perturbed by the Coulomb interaction of the two electrons.
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Laurence Pruvost. CORRELATIONS ELECTRONIQUES DES ETATS DOUBLE-RYDBERG DU BARYUM : CONTRIBUTIONS EXPERIMENTALES ET THEORIQUES. Physique Quantique [quant-ph]. Université de Paris-Sud, 1990. Français. ⟨tel-02963816⟩

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