ABSTRACT
The efg is the common quantity of diffractometry and spectroscopy and can be determined experimentally as well as theoretically. As one might infer from the terminus, it is the first local derivative of the electric field and, hence, the second derivative of the electrostatic potential stemming from surrounding charges at the site of a given nucleus: efg = ∇ ⇀ E ⇀ = − ∇ ⇀ ∇ ⇀ V = ( V x x V x y V x z V y x V y y V y z V z x V z y V z z ) , https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315196640/6bf3e800-cc06-43be-adf8-892f8d78b5a4/content/eq1.tif"/> with V i j = ∂ 2 V / ∂ i ∂ j ( i , j = x , y , z ) https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315196640/6bf3e800-cc06-43be-adf8-892f8d78b5a4/content/eq2.tif"/>
