Figure 4
From: Electron-ion coincidence measurements of molecular dynamics with intense X-ray pulses
(a) Kinetic energy distribution of the [N\(^{3+}\), N\(^{+}\)] coincidence channel. The experimental kinetic energy distribution is divided into 2 regions: a low-KER region (0–27.4 eV, red), and a high-KER region (27.4–100 eV, blue). The calculated KER distribution for an XFEL pulse with Gaussian temporal shape [60 fs pulse duration (FWHM)] is shown by the cyan symbols. (b) Calculated KER of the [N\(^{3+}\), N\(^{+}\)] channel for discrete time delays \(\Delta t\) between the two photoabsorption steps along with the N\(^+\)-N\(^+\) internuclear distance at the time of the second photoabsorption. The values in square brackets are the average KER and internuclear distance for each time delay (see text). The vertical gray dashed line is the 27.4-eV boundary between the “low-KER” and “high-KER” regions chosen in panel (a).
