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Search: WFRF:(Lahl Jan) > (2017)

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1.
  • Burt, Michael, et al. (author)
  • Coulomb-explosion imaging of concurrent CH2BrI photodissociation dynamics
  • 2017
  • In: Physical Review A: covering atomic, molecular, and optical physics and quantum information. - 2469-9926 .- 2469-9934. ; 96:4
  • Journal article (peer-reviewed)abstract
    • The dynamics following laser-induced molecular photodissociation of gas-phase CH2BrI at 271.6 nm were investigated by time-resolved Coulomb-explosion imaging using intense near-IR femtosecond laser pulses. The observed delay-dependent photofragment momenta reveal that CH2BrI undergoes C-I cleavage, depositing 65.6% of the available energy into internal product states, and that absorption of a second UV photon breaks the C-Br bond of C(H)2Br. Simulations confirm that this mechanism is consistent with previous data recorded at 248 nm, demonstrating the sensitivity of Coulomb-explosion imaging as a real-time probe of chemical dynamics.
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2.
  • Coudert-Alteirac, Hélène, et al. (author)
  • Micro-focusing of broadband high-order harmonic radiation by a double toroidal mirror
  • 2017
  • In: Applied Sciences (Switzerland). - : MDPI AG. - 2076-3417. ; 7:11
  • Journal article (peer-reviewed)abstract
    • We present an optical system based on two toroidal mirrors in aWolter configuration to focus broadband extreme ultraviolet (XUV) radiation. Optimization of the focusing optics alignment is carried out with the aid of an XUV wavefront sensor. Back-propagation of the optimized wavefront to the focus yields a focal spot of 3.6 × 4.0 μm2 full width at half maximum, which is consistent with ray-tracing simulations that predict a minimum size of 3.0 × 3.2 μm2. This work is important for optimizing the intensity of focused high-order harmonics in order to reach the nonlinear interaction regime.
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