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Sökning: WFRF:(Grunert C)

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  • Hartmann, N., et al. (författare)
  • Attosecond time-energy structure of X-ray free-electron laser pulses
  • 2018
  • Ingår i: Nature Photonics. - 1749-4885. ; 12:4, s. 215-220
  • Tidskriftsartikel (refereegranskat)abstract
    • The time-energy information of ultrashort X-ray free-electron laser pulses generated by the Linac Coherent Light Source is measured with attosecond resolution via angular streaking of neon 1s photoelectrons. The X-ray pulses promote electrons from the neon core level into an ionization continuum, where they are dressed with the electric field of a circularly polarized infrared laser. This induces characteristic modulations of the resulting photoelectron energy and angular distribution. From these modulations we recover the single-shot attosecond intensity structure and chirp of arbitrary X-ray pulses based on self-amplified spontaneous emission, which have eluded direct measurement so far. We characterize individual attosecond pulses, including their instantaneous frequency, and identify double pulses with well-defined delays and spectral properties, thus paving the way for X-ray pump/X-ray probe attosecond free-electron laser science. © 2018 The Author(s).
  • Vas de Almeida, M D., et al. (författare)
  • Alcohol consumption in elderly people across European countries : Results from the food in later life project
  • 2005
  • Ingår i: Ageing International. - 0163-5158 .- 1936-606X. ; 30:4, s. 377-395
  • Tidskriftsartikel (refereegranskat)abstract
    • The aim of this paper is to identify social and cultural aspects of alcohol consumption in a sample of older people living in their own homes, in eight different European countries. We explore several aspects of alcohol consumption, establishing comparisons between genders, age groups and living circumstances. The phenomenon of alcohol consumption within these countries and cultures is compared in order to gain a better understanding of similarities and differences.
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