Formative period in the x-ray-induced photodissociation of organic molecules
(2021) In Physical Review Research 3(1).- Abstract
- Absorption of x-ray photons by atomic inner shells of light-element organics and biomolecules often leads to formation of dicationic electronic states and to molecular fragmentation. We investigated the x-ray-induced dissociation landscape of a representative medium-sized organic molecule, thiophene, by femtosecond x-ray pulses from the Super Photon Ring-8 GeV (SPring-8) Angstrom Compact Free-Electron Laser (SACLA). Holes, created in the sulfur 2p orbital by photoemission, were filled by the Auger process that created dicationic molecular states within a broad range of internal energies—a starting point particular to x-ray-induced dynamics. The evolution of the ionized molecules was monitored by a pump-probe experiment using... (More)
- Absorption of x-ray photons by atomic inner shells of light-element organics and biomolecules often leads to formation of dicationic electronic states and to molecular fragmentation. We investigated the x-ray-induced dissociation landscape of a representative medium-sized organic molecule, thiophene, by femtosecond x-ray pulses from the Super Photon Ring-8 GeV (SPring-8) Angstrom Compact Free-Electron Laser (SACLA). Holes, created in the sulfur 2p orbital by photoemission, were filled by the Auger process that created dicationic molecular states within a broad range of internal energies—a starting point particular to x-ray-induced dynamics. The evolution of the ionized molecules was monitored by a pump-probe experiment using a near-infrared (800 nm) laser pulse. Ion-ion coincidence and ion momentum analysis reveals enhanced yields of ionic fragments from multibody breakup of the ring, attributed to additional ionization of the highly excited fraction of the dicationic parent molecular states. The transient nature of the enhancement and its decay with about a 160-fs time constant indicate formation of an open-ring parent geometry and the statistical survival time of the parent species before the dissociation events. By probing specific Auger final states of transient, highly excited nature by near-infrared light, we demonstrate how pump-probe signatures can be related to the key features in dynamics during the early period of the x-ray-induced damage of organic molecules and biomolecules. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/b4f2970f-922b-48d5-9406-7750562f2d77
- author
- Kukk, E.
; Fukuzawa, H.
; Niskanen, J.
; Nagaya, K.
; Kooser, K.
; You, D.
; Peschel, J.
LU
; Maclot, S.
LU
; Niozu, A.
; Saito, S.
; Luo, Y.
; Pelimanni, E.
; Itälä, E.
; Bozek, J. D.
; Takanashi, T
; Berholts, M.
; Johnsson, P.
LU
and Ueda, K.
(Less) - organization
- publishing date
- 2021
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review Research
- volume
- 3
- issue
- 1
- article number
- 013221
- pages
- 12 pages
- publisher
- American Physical Society
- external identifiers
-
- scopus:85112091228
- ISSN
- 2643-1564
- DOI
- 10.1103/PhysRevResearch.3.013221
- language
- English
- LU publication?
- yes
- id
- b4f2970f-922b-48d5-9406-7750562f2d77
- date added to LUP
- 2021-04-02 12:11:10
- date last changed
- 2022-04-27 01:14:57
@article{b4f2970f-922b-48d5-9406-7750562f2d77,
abstract = {{Absorption of x-ray photons by atomic inner shells of light-element organics and biomolecules often leads to formation of dicationic electronic states and to molecular fragmentation. We investigated the x-ray-induced dissociation landscape of a representative medium-sized organic molecule, thiophene, by femtosecond x-ray pulses from the Super Photon Ring-8 GeV (SPring-8) Angstrom Compact Free-Electron Laser (SACLA). Holes, created in the sulfur <b>2<i>p</i></b> orbital by photoemission, were filled by the Auger process that created dicationic molecular states within a broad range of internal energies—a starting point particular to x-ray-induced dynamics. The evolution of the ionized molecules was monitored by a pump-probe experiment using a near-infrared (800 nm) laser pulse. Ion-ion coincidence and ion momentum analysis reveals enhanced yields of ionic fragments from multibody breakup of the ring, attributed to additional ionization of the highly excited fraction of the dicationic parent molecular states. The transient nature of the enhancement and its decay with about a 160-fs time constant indicate formation of an open-ring parent geometry and the statistical survival time of the parent species before the dissociation events. By probing specific Auger final states of transient, highly excited nature by near-infrared light, we demonstrate how pump-probe signatures can be related to the key features in dynamics during the early period of the x-ray-induced damage of organic molecules and biomolecules.}},
author = {{Kukk, E. and Fukuzawa, H. and Niskanen, J. and Nagaya, K. and Kooser, K. and You, D. and Peschel, J. and Maclot, S. and Niozu, A. and Saito, S. and Luo, Y. and Pelimanni, E. and Itälä, E. and Bozek, J. D. and Takanashi, T and Berholts, M. and Johnsson, P. and Ueda, K.}},
issn = {{2643-1564}},
language = {{eng}},
number = {{1}},
publisher = {{American Physical Society}},
series = {{Physical Review Research}},
title = {{Formative period in the x-ray-induced photodissociation of organic molecules}},
url = {{http://dx.doi.org/10.1103/PhysRevResearch.3.013221}},
doi = {{10.1103/PhysRevResearch.3.013221}},
volume = {{3}},
year = {{2021}},
}