Figure 4.

Cluster-induced force acting on the electron moving away from the center of the cluster. Cluster-induced force (Equation 9) acting on the electron moving away from the center of the cluster (N = 20, r_s = 4), as a function of the electronic position in three cases: (1) There is no hole at the center of the cluster and the initial velocity of the electron is 1.5 a.u. (green line). (2) There is a hole at the center of the cluster, but the photoemitted electron does not interact directly with the hole. The initial velocity of the electron is 1.5 a.u. (blue line). (3) There is a hole at the center of the cluster and a direct electron-hole interaction (Equation 13) is included. The initial velocity of the electron is 2.25 a.u. (red line). The vertical dashed line shows the radius of the cluster, R_cl = 10.86 a.u.