“…Fisher–Shannon complexity measure for a probability density
is defined jointly by the Fisher information
and the Shannon entropic power. The Fisher information [
49, 51–53, 55, 83, 88, 93, 100, 101] is a point‐to‐point measure of the electron cloud distribution since it is a gradient functional of
and in configuration space is tightly connected to the kinetic energy due to its dependence on the gradient of the distribution. It is interpreted as a measure of the tendency toward disorder, meaning that the larger this quantity is, the more ordered the distribution will be.…”