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Träfflista för sökning "WFRF:(Glownia James M.) srt2:(2010-2014)"

Sökning: WFRF:(Glownia James M.) > (2010-2014)

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1.
  • Cryan, James P., et al. (författare)
  • Auger Electron Angular Distribution of Double Core-Hole States in the Molecular Reference Frame
  • 2010
  • Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 105:8, s. 083004-
  • Tidskriftsartikel (refereegranskat)abstract
    • The Linac Coherent Light Source free electron laser is a source of high brightness x rays, 2×1011 photons in a ∼5  fs pulse, that can be focused to produce double core vacancies through rapid sequential ionization. This enables double core vacancy Auger electron spectroscopy, an entirely new way to study femtosecond chemical dynamics with Auger electrons that probe the local valence structure of molecules near a specific atomic core. Using 1.1 keV photons for sequential x-ray ionization of impulsively aligned molecular nitrogen, we observed a rich single-site double core vacancy Auger electron spectrum near 413 eV, in good agreement with ab initio calculations, and we measured the corresponding Auger electron angle dependence in the molecular frame.
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2.
  • Glownia, James M., et al. (författare)
  • Time-resolved pump-probe experiments at the LCLS
  • 2010
  • Ingår i: Optics Express. - 1094-4087. ; 18:17, s. 17620-17630
  • Tidskriftsartikel (refereegranskat)abstract
    • The first time-resolved x-ray/optical pump-probe experiments at the SLAC Linac Coherent Light Source (LCLS) used a combination of feedback methods and post-analysis binning techniques to synchronize an ultrafast optical laser to the linac-based x-ray laser. Transient molecular nitrogen alignment revival features were resolved in time-dependent x-ray-induced fragmentation spectra. These alignment features were used to find the temporal overlap of the pump and probe pulses. The strong-field dissociation of x-ray generated quasi-bound molecular dications was used to establish the residual timing jitter. This analysis shows that the relative arrival time of the Ti:Sapphire laser and the x-ray pulses had a distribution with a standard deviation of approximately 120 fs. The largest contribution to the jitter noise spectrum was the locking of the laser oscillator to the reference RF of the accelerator, which suggests that simple technical improvements could reduce the jitter to better than 50 fs.
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