Electronic state dependence in the dissociation of core-ionized methane
2007 (English)In: Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, E-ISSN 1361-6455, Vol. 40, no 18, 3677-3692 p.Article in journal (Refereed) Published
Methane and deuteromethane molecules were core ionized using synchrotron radiation, and the ionic fragments from the molecular dissociation were detected in coincidence with the Auger electrons. The electron - ion coincidence spectra are analysed in terms of partial ion yields and ion kinetic energy distributions, both as functions of electron kinetic energy. The dependence of the fragmentation patterns on the electronic character of the Auger final states as well as on the excess energy available for dissociating the molecule is studied. The analysis reveals marked differences in the dissociation of the 2a(1)(-2) and 2a(1)(-1) 1t(2)(-1) states, interpreted as an `excess- energy- dependent' concerted dissociation process for the 2a(1)(-2) state and an ` electronic- state- dependent' sequential process for the 2a(1)(-1) 1t(2)(-1) state.
Place, publisher, year, edition, pages
2007. Vol. 40, no 18, 3677-3692 p.
photochemistry beamline bl27su, x-ray, photoelectron-spectra, coincidence, ionization, molecules, ch4, photoionization, radiation, decay
IdentifiersURN: urn:nbn:se:kth:diva-16998DOI: 10.1088/0953-4075/40/18/008ISI: 000249864600010ScopusID: 2-s2.0-35748951902OAI: oai:DiVA.org:kth-16998DiVA: diva2:335041
QC 201005252010-08-052010-08-05Bibliographically approved