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Figure 1
(a) Example plot of a partial cross-section ratio [\sigma^{{2+}}/\sigma^{{1+}}] for xenon. (b) Reference data (Suzuki & Saito, 1992aBB9,bBB10, 2001BB23) for the mean charge of rare gas ions after photoionization versus photon energy. (c) Example of an ion time-of-flight spectrum averaged over 257 single shots of FLASH at λ = 17.4 nm using Xe and Ne as target gases. For a decreasing FEL wavelength, the intensities of the Xe3+ and Xe2+ signals increase whereas the Xe+ line decreases, leading to a change in the mean charge as well as the cross section ratio values, as illustrated by the arrows.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 23| Part 1| January 2016| Pages 10-20
doi:10.1107/S1600577515022675
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