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2020 (English)In: Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, E-ISSN 1361-6455, Vol. 53, no 24, article id 244001Article in journal (Refereed) Published
Abstract [en]
The Avobenzone (AVOB) molecule is very photoactive and undergoes irreversible degradation upon irradiation. We studied its valence and core-level (C1s and O1s) photoionisation and subsequent photofragmentation with photoelectron spectroscopy and photoelectron-photoion-photoion coincidence (PEPIPICO) spectroscopy. AVOB is one of the largest molecules studied with this technique. The results show that the AVOB molecule dissociates into an extensive range of fragments by different pathways with little element or site-selectivity. The coincident maps were used to determine selected fragment separation sequences by analysing the slopes of patterns from ion pairs after the core ionisation. Charge delocalisation over the benzene rings and their relative stability favor fragmentation by cleavage of the bridge between them.
Place, publisher, year, edition, pages
IOP PUBLISHING LTD, 2020
Keywords
PEPIPICO, photofragmentation, time-of-flight mass spectrometry, radiation damage, electron spectroscopy, avobenzone
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:uu:diva-428313 (URN)10.1088/1361-6455/abc228 (DOI)000590714400001 ()
Funder
EU, Horizon 2020, 730872Swedish Research Council, VR 2017-04162Swedish Research Council, 2018-07152Vinnova, 2018-04969Swedish Research Council Formas, 2019-02496
2020-12-142020-12-142021-02-25Bibliographically approved