[Spectroscopie des états de Rydberg de l'acétylène étudiés par absorption VUV et ionisation multiphotonique résonante à -photons]
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– 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– 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.
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
@article{CRPHYS_2004__5_2_239_0,
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},
}
TY - JOUR AU - Séverine Boyé AU - Andrea Campos AU - Jean-Hugues Fillion AU - Stéphane Douin AU - Niloufar Shafizadeh AU - Dolores Gauyacq TI - Spectroscopy of acetylene Rydberg states studied by VUV absorption and (3+1)-Resonantly Enhanced Multiphoton Ionisation JO - Comptes Rendus. Physique PY - 2004 SP - 239 EP - 248 VL - 5 IS - 2 PB - Elsevier DO - 10.1016/j.crhy.2004.01.012 LA - en ID - CRPHYS_2004__5_2_239_0 ER -
%0 Journal Article %A Séverine Boyé %A Andrea Campos %A Jean-Hugues Fillion %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 %J Comptes Rendus. Physique %D 2004 %P 239-248 %V 5 %N 2 %I Elsevier %R 10.1016/j.crhy.2004.01.012 %G en %F CRPHYS_2004__5_2_239_0
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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