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Towards imaging of ultrafast molecular dynamics using FELs

Rouzee, A.; Johnsson, Per LU ; Rading, Linnea LU ; Hundertmark, A.; Siu, W.; Huismans, Y.; Duesterer, S.; Redlin, H.; Tavella, F. and Stojanovic, N., et al. (2013) In Journal of Physics B: Atomic, Molecular and Optical Physics 46(16).
Abstract
The dissociation dynamics induced by a 100 fs, 400 nm laser pulse in a rotationally cold Br-2 sample was characterized by Coulomb explosion imaging (CEI) using a time-delayed extreme ultra-violet (XUV) FEL pulse, obtained from the Free electron LASer in Hamburg (FLASH). The momentum distribution of atomic fragments resulting from the 400 nm-induced dissociation was measured with a velocity map imaging spectrometer and used to monitor the internuclear distance as the molecule dissociated. By employing the simultaneously recorded in-house timing electro-optical sampling data, the time resolution of the final results could be improved to 300 fs, compared to the inherent 500 fs time-jitter of the FEL pulse. Before dissociation, the Br-2... (More)
The dissociation dynamics induced by a 100 fs, 400 nm laser pulse in a rotationally cold Br-2 sample was characterized by Coulomb explosion imaging (CEI) using a time-delayed extreme ultra-violet (XUV) FEL pulse, obtained from the Free electron LASer in Hamburg (FLASH). The momentum distribution of atomic fragments resulting from the 400 nm-induced dissociation was measured with a velocity map imaging spectrometer and used to monitor the internuclear distance as the molecule dissociated. By employing the simultaneously recorded in-house timing electro-optical sampling data, the time resolution of the final results could be improved to 300 fs, compared to the inherent 500 fs time-jitter of the FEL pulse. Before dissociation, the Br-2 molecules were transiently 'fixed in space' using laser-induced alignment. In addition, similar alignment techniques were used on CO2 molecules to allow the measurement of the photoelectron angular distribution (PAD) directly in the molecular frame (MF). Our results on MFPADs in aligned CO2 molecules, together with our investigation of the dissociation dynamics of the Br-2 molecules with CEI, show that information about the evolving molecular structure and electronic geometry can be retrieved from such experiments, therefore paving the way towards the study of complex non-adiabatic dynamics in molecules through XUV time-resolved photoion and photoelectron spectroscopy. (Less)
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published
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Journal of Physics B: Atomic, Molecular and Optical Physics
volume
46
issue
16
publisher
IOP Publishing
external identifiers
  • wos:000323113100030
  • scopus:84883167167
ISSN
0953-4075
DOI
10.1088/0953-4075/46/16/164029
language
English
LU publication?
yes
id
e2da815b-3fb6-42bb-b711-036f482f4d57 (old id 4172400)
date added to LUP
2013-11-21 13:51:25
date last changed
2019-10-15 04:53:10
@article{e2da815b-3fb6-42bb-b711-036f482f4d57,
  abstract     = {The dissociation dynamics induced by a 100 fs, 400 nm laser pulse in a rotationally cold Br-2 sample was characterized by Coulomb explosion imaging (CEI) using a time-delayed extreme ultra-violet (XUV) FEL pulse, obtained from the Free electron LASer in Hamburg (FLASH). The momentum distribution of atomic fragments resulting from the 400 nm-induced dissociation was measured with a velocity map imaging spectrometer and used to monitor the internuclear distance as the molecule dissociated. By employing the simultaneously recorded in-house timing electro-optical sampling data, the time resolution of the final results could be improved to 300 fs, compared to the inherent 500 fs time-jitter of the FEL pulse. Before dissociation, the Br-2 molecules were transiently 'fixed in space' using laser-induced alignment. In addition, similar alignment techniques were used on CO2 molecules to allow the measurement of the photoelectron angular distribution (PAD) directly in the molecular frame (MF). Our results on MFPADs in aligned CO2 molecules, together with our investigation of the dissociation dynamics of the Br-2 molecules with CEI, show that information about the evolving molecular structure and electronic geometry can be retrieved from such experiments, therefore paving the way towards the study of complex non-adiabatic dynamics in molecules through XUV time-resolved photoion and photoelectron spectroscopy.},
  articleno    = {164029},
  author       = {Rouzee, A. and Johnsson, Per and Rading, Linnea and Hundertmark, A. and Siu, W. and Huismans, Y. and Duesterer, S. and Redlin, H. and Tavella, F. and Stojanovic, N. and Al-Shemmary, A. and Lepine, F. and Holland, D. M. P. and Schlatholter, T. and Hoekstra, R. and Fukuzawa, H. and Ueda, K. and Vrakking, M. J. J.},
  issn         = {0953-4075},
  language     = {eng},
  number       = {16},
  publisher    = {IOP Publishing},
  series       = {Journal of Physics B: Atomic, Molecular and Optical Physics},
  title        = {Towards imaging of ultrafast molecular dynamics using FELs},
  url          = {http://dx.doi.org/10.1088/0953-4075/46/16/164029},
  volume       = {46},
  year         = {2013},
}