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Träfflista för sökning "(WFRF:(Baker J. H.)) srt2:(2005-2009) srt2:(2007)"

Sökning: (WFRF:(Baker J. H.)) srt2:(2005-2009) > (2007)

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  • Hau-Riege, S. P., et al. (författare)
  • Damage threshold of inorganic solids under free-electron-laser irradiation at 32.5 nm wavelength
  • 2007
  • Ingår i: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 90:17, s. 173128-
  • Tidskriftsartikel (refereegranskat)abstract
    • Samples of B4C, amorphous C, chemical-vapor-deposition-diamond C, Si, and SiC were exposed to single 25 fs long pulses of 32.5 nm free-electron-laser radiation at fluences of up to 2.2 J/cm(2). The samples were chosen as candidate materials for x-ray free-electron-laser optics. It was found that the threshold for surface damage is on the order of the fluence required for thermal melting. For larger fluences, the crater depths correspond to temperatures on the order of the critical temperature, suggesting that the craters are formed by two-phase vaporization.
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  • Cumnock, Judy, et al. (författare)
  • On the stability of high-latitude plasma convection during northward IMF : an event study
  • 2007
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • We investigate the stability of the ionospheric convection pattern during northward IMF by studying an event where two DMSP satellites repeatedly traversed the Southern polar region. The Cluster satellite’s ionospheric footprint is located near the DMSP satellite tracks, moving slowly in the noon-midnight direction. TIMED/GUVI data confirm the presence of auroral activity at high latitude. SuperDARN plasma velocity data partially complete the picture. From the event studied we conclude that whereas the DMSP satellites observe local variations in the convection pattern between consecutive passes, Cluster confirms the existence of persistent sunward convection in the high-latitude ionosphere on a time scale of several hours.
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