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- W1979572539 abstract "The ungerade ns+nd Rydberg states of C2H2 converging to the ground state of the C2H2+ cation have been investigated in the energy range 74 000–88000 cm−1 by (3+1)-multiphoton ionisation (REMPI) and by VUV absorption spectroscopy at the Super-ACO synchrotron radiation facility. Both methods have allowed the selective analysis of the Rydberg transitions with rotational resolution. Mulliken's semi-united atom model, in which predissociation has been taken into account, was used to understand the relative three-photon intensities among the different electronic transitions within the same Rydberg supercomplex. Lifetimes have been evaluated and illustrate very different behaviours towards predissociation for the observed Rydberg states. To cite this article: S. Boyé et al., C. R. Physique 5 (2004). Nous avons étudié les états de Rydberg ungerade ns+nd de l'acétylène convergeant vers l'état fondamental du cation C2H2+ dans le domaine d'énergie 74 000–88000 cm−1 par ionisation multiphotonique résonante à (3+1)-photons et par absorption VUV au rayonnement synchrotron. Ces deux méthodes ont permis d'analyser sélectivement les transitions de Rydberg avec une résolution rotationnelle. Le modèle de l'atome semi-uni de Mulliken a permis d'interpréter les spectres à trois photons des transitions électroniques d'un même supercomplexe de Rydberg en y incluant la prédissociation. Des comportements très variés sont observés dans la prédissociation de ces états à travers l'évaluation de leurs durées de vie. Pour citer cet article : S. Boyé et al., C. R. Physique 5 (2004)." @default.
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- W1979572539 date "2004-03-01" @default.
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- W1979572539 title "Spectroscopy of acetylene Rydberg states studied by VUV absorption and (3+1)-Resonantly Enhanced Multiphoton Ionisation" @default.
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