Comptes Rendus
Spectroscopy of acetylene Rydberg states studied by VUV absorption and (3+1)-Resonantly Enhanced Multiphoton Ionisation
[Spectroscopie des états de Rydberg de l'acétylène étudiés par absorption VUV et ionisation multiphotonique résonante à (3+1)-photons]
Comptes Rendus. Physique, Volume 5 (2004) no. 2, pp. 239-248.

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.

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.

Publié le :
DOI : 10.1016/j.crhy.2004.01.012
Keywords: VUV, Acetylene, Rydberg state, REMPI, Simulations, Semi-united atom, Predissociation
Mot clés : VUV, Acétylène, État de Rydberg, IMPR, Simulations, Atome semi-uni, Prédissociation

Séverine Boyé 1 ; Andrea Campos 2 ; Jean-Hugues Fillion 3 ; Stéphane Douin 1 ; Niloufar Shafizadeh 1 ; Dolores Gauyacq 1

1 Laboratoire de photophysique moléculaire, CNRS UPR 3361, bâtiment 210, Université de Paris-Sud, 91405 Orsay cedex, France
2 Instituto de Criminalı́stica Carlos Éboli, Rua Pedro I, no 28 – Centro, Rio de Janeiro, RJ, Brazil
3 LERMA-LAMAp, UMR 8112 du CNRS, Observatoire de Paris & Université de Cergy-Pontoise, 5, mail Gay-Lussac, 95031 Cergy-Pontoise cedex, France
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     title = {Spectroscopy of acetylene {Rydberg} states studied by {VUV} absorption and {(3+1)-Resonantly} {Enhanced} {Multiphoton} {Ionisation}},
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Séverine Boyé; Andrea Campos; Jean-Hugues Fillion; Stéphane Douin; Niloufar Shafizadeh; Dolores Gauyacq. Spectroscopy of acetylene Rydberg states studied by VUV absorption and (3+1)-Resonantly Enhanced Multiphoton Ionisation. Comptes Rendus. Physique, Volume 5 (2004) no. 2, pp. 239-248. doi : 10.1016/j.crhy.2004.01.012. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2004.01.012/

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