Figure 11

(a) Xenon LIF spectra of the transition at 834.7 nm measured in the center of the ion source discharge chamber for three different operation conditions (normalization to maximum LIF intensity; dotted lines are guides to the eyes). The computed naturally broadened hyperfine structure lineshape has been drawn with a vertical offset for clarity. The inset shows the line center with a stretched frequency detuning axis. (b) Doppler lineshapes (projected radial velocity distribution functions, respectively) extracted from the LIF spectra (circle markers) and best-fit Gaussian profiles (solid lines) depending on the respective kinetic temperature of the xenon neutrals