Molecular Orbital Imaging by Multi-Dimensional Electron Spectroscopy

【Abstract】Electron spectroscopy combined with a scattering experiment offers a powerful means to study spatial characteristics of a one-electron wavefunction in molecules or in continuum states. Here we review recent developments in such multi-dimensional electron spectroscopy studies which utilize atomic, photonic, and electronic collisions. In addition, we also review our recent efforts towards development of time-resolved electron momentum spectroscopy that employs femtosecond laser and picosecond electron pulses in a pump-probe scheme. In spite of the low data statistics as well as of the limited experimental resolutions, it has been clearly demonstrated that measurements of electron momentum profiles of short-lived transient species are feasible, opening the door to time-resolved orbital imaging in momentum space.