SEARCH Articles Figures Tables Conical intersections gradient difference vector Electronic charge density gradient vector field Energy difference gradient vector Gradient difference vector Gradient difference vector, direct Gradient difference vector, direct conical intersections Gradient of a vector Gradient of a vector field Gradient vector estimation Gradient vector field Gradient vector field of the charge density Gradient vector field of the electron Gradient vector field of the electron density Molecular charge density, gradient vector Phase portraits of the gradient vector field Trajectories of the gradient vector field Vector differentiation gradient Vectors path, gradient