Fig. 1. Single-photon ionization of the 2p⁶-ground state of neon.

Illustration of the photoionization process for the angular momentum channels, 2p → εs, m = 0, 2p → εs d, m = 0 2p → εd m = ± 1. A time-energy representation (the Wigner distribution) of the created broadband wavepackets for each channel, based on simulations, is shown in green (2p → εs) and blue (2p → εd). The data points represent our experimental measurements of Wigner time delays. The channels with different initial states add incoherently, while those with the same initial state and different final states add coherently, as indicated by the mathematical signs. The angular distributions for each channel, given by spherical harmonics, are indicated at the top.