Landau-Zener transitions through small electronic eigenvalue gaps in the Born-Oppenheimer approximation

Nous etudions la propagation de paquets d'ondes moleculaires au travers des deux types les plus simples de croisements evites de niveaux d'energie electroniques, dans la limite ou le gap entre ces valeurs propres decroit lorsque les masses nucleaires augmentent. Pour ces types de croisements evites, les niveaux d'energie electroniques ne dependent essentiellement que d'un seul des parametres de configuration nucleaire , comme c'est le cas pour toute molecule diatomique. Nous observons que les probabilites de transition sont d'ordre un et sont determines par la formule de Landau-Zener.

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