Mean value of the electric field gradient in a molecule

The relationship between the mean value of the second derivative of the electrostatic potential of the electronic shell of a molecule on its axis and the first derivative of the energy of the molecule with respect to the internuclear distance has been established.Scientific-Research Institute of Physics, Leningrad State University. Translated from Zhurnal Strukturnoi Khimii, Vol. 32, No. 2, pp. 47–50, March–April, 1991.