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Demonstration of Kr(L) amplification at λ = 7.5 Å from Kr clusters in self-trapped plasma channels

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.