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Träfflista för sökning "WFRF:(Stojanovic M) srt2:(2010-2014)"

Sökning: WFRF:(Stojanovic M) > (2010-2014)

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1.
  • Rouzee, A., et al. (författare)
  • Towards imaging of ultrafast molecular dynamics using FELs
  • 2013
  • Ingår i: Journal of Physics B: Atomic, Molecular and Optical Physics. - : IOP Publishing. - 0953-4075 .- 1361-6455. ; 46:16
  • Tidskriftsartikel (refereegranskat)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.
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2.
  • Sokolowski-Tinten, Klaus, et al. (författare)
  • Short-pulse Laser Induced Transient Structure Formation and Ablation Studied with Time-resolved Coherent XUV-scattering
  • 2010
  • Ingår i: INTERNATIONAL SYMPOSIUM ON HIGH POWER LASER ABLATION 2010. - : AIP. ; , s. 373-379
  • Konferensbidrag (refereegranskat)abstract
    • The structural dynamics of short-pulse laser irradiated surfaces and nano-structures has been studied with nm spatial and ultrafast temporal resolution by means of single-shot coherent XUV-scattering techniques. The experiments allowed us to time-resolve the formation of laser-induced periodic surface structures, and to follow the expansion and disintegration of nano-objects during laser ablation.
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4.
  • Johnsson, Per, et al. (författare)
  • Characterization of a two-color pump-probe setup at FLASH using a velocity map imaging spectrometer
  • 2010
  • Ingår i: Optics Letters. - 0146-9592. ; 35:24, s. 4163-4165
  • Tidskriftsartikel (refereegranskat)abstract
    • We report on the implementation of a high-count-rate charged particle imaging detector for two-color pump-probe experiments at the free electron laser in Hamburg (FLASH). In doing so, we have developed a procedure for finding the spatial and temporal overlap between the extreme UV free electron laser (FEL) pulses and the IR pulses, which allows for complete alignment of the setup in situations where the region of overlap between the FEL and the IR is not easily accessible by means of imaging optics. (C) 2010 Optical Society of America
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  • Resultat 1-4 av 4

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