Fig. 3: Charge migration in molecules.
From: Attosecond science based on high harmonic generation from gases and solids
a The reconstructed electron–hole density from HHG spectroscopy as a function of time after strong-field ionization of HCCI. Reproduced from ref. 71 with permission from AAAS. b Dipole moment oscillations of C2HCI+ ionized from a HOMO/HOMO-1 superposition of states. Reproduced from ref. 79 (2017), AIP. c Charge migration measured using attosecond X-ray transient absorption. The mixed hole state in C2HI+ is formed by strong-field ionization. The valence hole is probed by core-to-valence transitions. Adapted from ref. 79 (2017), AIP.
