Fig. 1: Effect of electron scattering on HHG spectra in liquids.
From: High-harmonic spectroscopy of low-energy electron-scattering dynamics in liquids
a, Schematic illustration of the extended trajectory-based semi-classical model. An electron (green) is ionized by the laser field, accelerated and then either recombines directly with its parent ion (dashed green arrow) or scatters off another molecule. b, Trajectories of returning electrons from the standard TSM within an 800 nm driving laser field of 1.9 V Å−1. The dots on the electric field (red dashed-dotted line) represent the ionization times of the electrons (the colour of a dot corresponds to the colour of the respective trajectories). The horizontal grey dashed line denotes the limited excursion length (lmax) of 8 Å, imposed by scattering. c, Wavelength-scaling of Ec in the absence (standard TSM: black dashed line) and presence (lmax-limited: coloured lines) of scattering for a laser intensity of 5 × 1013 W cm−2. The observable manifestation of scattering is a decrease in the cut-off by ΔEc. SFA, strong-field approximation.
