atom-atom polarizability

https://doi.org/10.1351/goldbook.AT06992
A quantity used in perturbation HMO theory as a measure of the change in @E01986@, \(q\), of atom \(s\) caused by a change in the @E01990@ (or @C01366@) of atom \(r\): \[\pi _{\text{sr}}=\frac{\partial q_{\text{s}}}{\partial a_{\text{r}}}\]
Source:
PAC, 1999, 71, 1919. (Glossary of terms used in theoretical organic chemistry) on page 1924 [Terms] [Paper]