Comparative Kr(L) spectra obtained under three different modalities of excitation are shown
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Figure 12. Comparative Kr(L) spectra obtained under three different modalities of excitation are shown. (a) Axially recorded Kr(L) spectrum produced with self-trapped 248 nm channel (this work, file 677/18 May 2012). The principal feature is the 1P1 → 1S0 Kr26+ 3s → 2p transition at λ 7.504 Å. (b) Kr(L) emission spectrum recorded with 248 nm excitation without channelled propagation. The emission profile is dominated by a broad feature involving several transitions in the 6.8–7.2 Å range. For details, see . (c) Kr(L) spectrum obtained with excitation at ~1 µm without channelled propagation. See  for additional details.
Experimental evidence demonstrating amplification on the Kr26+ 3s→2p transition at λ 7.5 Å (~1652 eV) generated from a (Kr)n cluster medium in a self-trapped plasma channel produced with 248 nm femtosecond pulses is presented. The x-ray beam produced had a spectral width of ~3 eV and a corresponding beam diameter of ~150 µm, properties that were simultaneously determined by a two-dimensional x-ray spectral image formed with an axially placed von Hámos spectrometer and a matching Thomson image of the spatial electron density generated by the x-ray propagation.