Spectroscopy of acetylene Rydberg states studied by VUV absorption and (3+1)-Resonantly Enhanced Multiphoton Ionisation

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

doi:10.1016/j.crhy.2004.01.012

Spectroscopy of acetylene Rydberg states studied by VUV absorption and (3+1)-Resonantly Enhanced Multiphoton Ionisation

Presented by: Guy Laval

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

Comptes Rendus. Physique, Gas phase molecular spectroscopy, Volume 5 (2004) no. 2, pp. 239-248.

Abstract
Résumé

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– $88 000 {cm}^{- 1}$ 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.

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– $88 000 {cm}^{- 1}$ 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.

Published online: 2004-03-01

DOI: 10.1016/j.crhy.2004.01.012

Keywords: VUV, Acetylene, Rydberg state, REMPI, Simulations, Semi-united atom, Predissociation
Mots-clés : VUV, Acétylène, État de Rydberg, IMPR, Simulations, Atome semi-uni, Prédissociation

Author's affiliations:

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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     author = {S\'everine Boy\'e and Andrea Campos and Jean-Hugues Fillion and St\'ephane Douin and Niloufar Shafizadeh and Dolores Gauyacq},
     title = {Spectroscopy of acetylene {Rydberg} states studied by {VUV} absorption and {(3+1)-Resonantly} {Enhanced} {Multiphoton} {Ionisation}},
     journal = {Comptes Rendus. Physique},
     pages = {239--248},
     publisher = {Elsevier},
     volume = {5},
     number = {2},
     year = {2004},
     doi = {10.1016/j.crhy.2004.01.012},
     language = {en},
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%A Stéphane Douin
%A Niloufar Shafizadeh
%A Dolores Gauyacq
%T 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, Gas phase molecular spectroscopy, 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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