Fig. 2
From: Attosecond coherent control of free-electron wave functions using semi-infinite light fields
Energy exchange during electron–light interaction. a Sequence of measured EELS spectra (color map) plotted as a function of increasing angle ϑ. We use p-polarized light (incident field along x axis), α = αC, a peak field amplitude of 12.8 × 107 V/m, and light and electron pulse durations τL = 430 fs and τe = 410 fs. Sidebands at energies \(\pm \ell \hbar \omega\) relative to the zero-loss peak (ZLP) are visible, where \(\ell\) is the net number of exchanged photons. b Sequence of EELS spectra measured for increasing light field amplitude with fixed tilt angle ϑ = 35°. c Spectra selected from a, measured at ϑ = 9° (blue curve) and ϑ = 30° (red curve), showing a strong redistribution of the electron density toward the high-energy sidebands for large tilt angle. d–f Simulated EELS spectra corresponding to the experimental conditions of a–c (see Methods for details of calculations)
