Ionization photophysics and Rydberg spectroscopy of diacetylene

Handle URI:
http://hdl.handle.net/10754/565863
Title:
Ionization photophysics and Rydberg spectroscopy of diacetylene
Authors:
Schwell, Martin; Bénilan, Yves; Fray, Nicolas; Gazeau, Marie Claire; Es-sebbar, Et-touhami; Gaie-Levrel, François; Champion, Norbert; Leach, Sydney Sydney
Abstract:
Photoionization of diacetylene was studied using synchrotron radiation over the range 8-24 eV, with photoelectron-photoion coincidence (PEPICO) and threshold photoelectron-photoion coincidence (TPEPICO) techniques. Mass spectra, ion yields, total and partial ionization cross-sections were measured. The adiabatic ionization energy of diacetylene was determined as IE ad=(10.17±0.01) eV, and the appearance energy of the principal fragment ion C4H+ as AE=(16.15±0.03) eV. Calculated appearance energies of other fragment ions were used to infer aspects of dissociation pathways forming the weaker fragment ions C+ 4, C3H+, C+3 and C 4H+. Structured autoionization features observed in the PEPICO spectrum of diacetylene in the 11-13 eV region were assigned to vibrational components of three new Rydberg series, R1(nsσg, n=4-11), R2(ndσg, n=4-7) and R3(ndδg, n=4-6) converging to the A2Πu state of the cation, and to a new series R01(nsσg, n=3) converging to the B' 2Σ+u state of the cation. The autoionization mechanisms and their consistence with specific selection rules are discussed. © 2012 Taylor and Francis.
KAUST Department:
Clean Combustion Research Center
Publisher:
Informa UK Limited
Journal:
Molecular Physics
Issue Date:
Nov-2012
DOI:
10.1080/00268976.2012.704084
Type:
Article
ISSN:
00268976
Appears in Collections:
Articles; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorSchwell, Martinen
dc.contributor.authorBénilan, Yvesen
dc.contributor.authorFray, Nicolasen
dc.contributor.authorGazeau, Marie Claireen
dc.contributor.authorEs-sebbar, Et-touhamien
dc.contributor.authorGaie-Levrel, Françoisen
dc.contributor.authorChampion, Norberten
dc.contributor.authorLeach, Sydney Sydneyen
dc.date.accessioned2015-08-11T13:44:00Zen
dc.date.available2015-08-11T13:44:00Zen
dc.date.issued2012-11en
dc.identifier.issn00268976en
dc.identifier.doi10.1080/00268976.2012.704084en
dc.identifier.urihttp://hdl.handle.net/10754/565863en
dc.description.abstractPhotoionization of diacetylene was studied using synchrotron radiation over the range 8-24 eV, with photoelectron-photoion coincidence (PEPICO) and threshold photoelectron-photoion coincidence (TPEPICO) techniques. Mass spectra, ion yields, total and partial ionization cross-sections were measured. The adiabatic ionization energy of diacetylene was determined as IE ad=(10.17±0.01) eV, and the appearance energy of the principal fragment ion C4H+ as AE=(16.15±0.03) eV. Calculated appearance energies of other fragment ions were used to infer aspects of dissociation pathways forming the weaker fragment ions C+ 4, C3H+, C+3 and C 4H+. Structured autoionization features observed in the PEPICO spectrum of diacetylene in the 11-13 eV region were assigned to vibrational components of three new Rydberg series, R1(nsσg, n=4-11), R2(ndσg, n=4-7) and R3(ndδg, n=4-6) converging to the A2Πu state of the cation, and to a new series R01(nsσg, n=3) converging to the B' 2Σ+u state of the cation. The autoionization mechanisms and their consistence with specific selection rules are discussed. © 2012 Taylor and Francis.en
dc.publisherInforma UK Limiteden
dc.titleIonization photophysics and Rydberg spectroscopy of diacetyleneen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.identifier.journalMolecular Physicsen
kaust.authorEs-sebbar, Et-touhamien
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