title: A partial differential equation for pseudocontact shift.
abstract: It is demonstrated that pseudocontact shift (PCS), viewed as a scalar or a tensor field in three dimensions, obeys an elliptic partial differential equation with a source term that depends on the Hessian of the unpaired electron probability density. The equation enables straightforward PCS prediction and analysis in systems with delocalized unpaired electrons, particularly for the nuclei located in their immediate vicinity. It is also shown that the probability density of the unpaired electron may be extracted, using a regularization procedure, from PCS data.
authors.affiliation: Oxford e-Research Centre, University of Oxford, 7 Keble Road, Oxford OX1 3QG, UK.
authors.forename: G T P
authors.initials: GT
authors.lastname: Charnock
authors.forename: Ilya
authors.initials: I
authors.lastname: Kuprov