Figure 6
From: Electron-ion coincidence measurements of molecular dynamics with intense X-ray pulses
Dynamic photoelectron line shift. (a) Experimental photoelectron kinetic energy spectra from Fig. 5, but zoomed into the energy range from 53 eV to 73 eV, corresponding to electrons emitted from N\(_{2}^{2+}\) in the second photoabsorption step. (b) Calculated photoelectron kinetic energy spectra of N\(_{2}^{2+}\) (\(1^{1}\Delta _{g}\)) as a function of internuclear distance. The color encodes the relative probability for a N\(_{2}^{2+}\) photoelectron to have certain energies for a given internuclear distances. The vertical gray dashed lines mark the peak positions (A, B and C) observed in the experimental spectra. The horizontal lines indicate the internuclear distances at which the vertical dashed lines cross the calculated photoelectron lines. The vertical dashed lines at peak C also crosses the calculated photoelectron line, but only at the internuclear distance larger than the range shown in the figure. The calculated photoelectron energy at larger internuclear distances are shown in Fig. 7. The blue and red dashed rectangles mark the regions centered at photoelectron energies of peaks A and B, respectively, with a width corresponding to the experimental energy bin size of 2.5 eV.
