Advanced

Electron-ion coincidence spectroscopy of a large organic molecule : photofragmentation of avobenzone after valence and core ionisation

Abid, Abdul Rahman ; Pelimanni, Eetu ; Reinhardt, Maximilian ; Boudjemia, Nacer ; Kivimaki, Antti LU ; Huttula, Marko ; Björneholm, Olle LU and Patanen, Minna (2020) In Journal of Physics B: Atomic, Molecular and Optical Physics 53(24).
Abstract

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... (More)

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.

(Less)
Please use this url to cite or link to this publication:
author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
avobenzone, electron spectroscopy, PEPIPICO, photofragmentation, radiation damage, time-of-flight mass spectrometry
in
Journal of Physics B: Atomic, Molecular and Optical Physics
volume
53
issue
24
article number
244001
publisher
IOP Publishing
external identifiers
  • scopus:85096900774
ISSN
0953-4075
DOI
10.1088/1361-6455/abc228
language
English
LU publication?
yes
id
a81c079c-f46d-464c-a086-42b55f8fc9f2
date added to LUP
2020-12-09 13:39:48
date last changed
2020-12-15 03:53:16
@article{a81c079c-f46d-464c-a086-42b55f8fc9f2,
  abstract     = {<p>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.</p>},
  author       = {Abid, Abdul Rahman and Pelimanni, Eetu and Reinhardt, Maximilian and Boudjemia, Nacer and Kivimaki, Antti and Huttula, Marko and Björneholm, Olle and Patanen, Minna},
  issn         = {0953-4075},
  language     = {eng},
  number       = {24},
  publisher    = {IOP Publishing},
  series       = {Journal of Physics B: Atomic, Molecular and Optical Physics},
  title        = {Electron-ion coincidence spectroscopy of a large organic molecule : photofragmentation of avobenzone after valence and core ionisation},
  url          = {http://dx.doi.org/10.1088/1361-6455/abc228},
  doi          = {10.1088/1361-6455/abc228},
  volume       = {53},
  year         = {2020},
}