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Figure 11
Example of a measurement of the spectral distribution of FLASH by means of an OPIS spectrum converted from time-of-flight to kinetic energy scale. (a) OPIS energy spectrum of Kr 3d photoelectrons with a spin–orbit splitting of 1.2 eV. The least-squares fit of two Gaussian profiles gives a mean linewidth of 1.1 eV (FWHM). (b) Corresponding PG spectrometer average spectrum. A Gaussian fit shows a FEL bandwidth of 0.15 nm, corresponding to 1.4 eV. The natural linewidth of the Kr 3d core-hole state is 101 meV (Hikosaka et al., 2000BB10).

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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