A photoionization mass spectrometric and threshold photoelectron-photoion coincidence study of vinylbromide (C2H3Br) in the vacuum ultraviolet range of 6-21 eV.
[en] The dissociative photoionization of vinyl bromide (C2H3Br) has been investigated by photoionization mass spectrometry (PIMS) and time-of-flight threshold photoelectron-photoion coincidence (TOF-TPEPICO) spectrometry using synchrotron radiation. The photoionization efficiency curves of the three most abundant ions, i.e. C2H3Br+, C2H3+ and C2H2+, are measured and analyzed in detail. A C2H3+/Br- photoion-pair formation process has been detected for the first time. Some arguments are provided in favor of the electronic excitation of the C2H3+ fragment and of the isomerization of the C2H2+ ions. The breakdown diagram for these ions in the 9.8–21 eV photon energy range, derived from TOF-TPEPICO mass
spectra, is discussed. The involvement of the successive C2H3Br+ ionic states and the role of autoionization of C2H3Br Rydberg states are emphasized. For the two minor HBr+ and Br+ fragment ions only the breakdown diagrams are measured and appearance energies are derived.
Research Center/Unit :
Laboratoire de Dynamique Moleculaire
Disciplines :
Chemistry
Author, co-author :
Hoxha, A.; Fertilzers Europe, Brussels
Yu, S.-Y.; Graduate University, Beiing, PR China
Locht, Robert ; Université de Liège - ULiège > Département de Chimie (Sciences) > Laboratoire de Dynamique Moléculaire
Jochims, H.-W.; Freie Universität Berlin > Institut für Physikalische und Theoretische Chemie
Leyh, Bernard ; Université de Liège - ULiège > Département de chimie (sciences) > Laboratoire de dynamique moléculaire
Language :
English
Title :
A photoionization mass spectrometric and threshold photoelectron-photoion coincidence study of vinylbromide (C2H3Br) in the vacuum ultraviolet range of 6-21 eV.
Alternative titles :
[en] Etude par photoionisation et par la coincidence photoelctron de seuil-photoion du bromure de vinyl (C2H3Br) dans le domaine de l'ultrviolet lointain de 6-21 eV.
Publication date :
2011
Journal title :
Chemical Physics
ISSN :
0301-0104
Publisher :
Elsevier Science, Amsterdam, Netherlands
Volume :
379
Issue :
1-3
Pages :
99-108
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
Contrat
Funders :
DG RDT - Commission Européenne. Direction Générale de la Recherche et de l'Innovation
Commentary :
- PDF-version of Editor's Postprint available on request
- Version-pdf du tiré-à-part disponible sur demande
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