Figure 5
Ion time-of-flight (TOF) mass/charge spectra of Xe taken at λ = 52.22 nm (23.74 eV) for different focusing conditions. Each spectrum is a sum over several spectra; all spectra have been recorded with the same FEL intensity. In the inset (blue line) we show the Xe2+/Xe+ intensity ratio as a function of time while changing the curvature of the K–B mirrors. |