One form of this quantity can be computed as the line integral of a connection over a closed path in parameter space. The partial-wave expansion gives each angular momentum component of the outgoing wave a different value of this quantity. The adiabatic approximation distinguishes dynamic and geometric forms of this quantity, the latter of which is named after Michael Berry. This quantity (-5[1])changes for an electron moving (10[1])around a solenoid in the Aharonov-Bohm effect. For a stationary state with energy E, this quantity changes after time t by ■END■