atom-bond polarizability

https://doi.org/10.1351/goldbook.AT06993
A quantity used in perturbation HMO theory as a measure of the change in @E01986@, $$q$$, of atom $$m$$ caused by a change in the @R05337@, $$\beta$$, of bond $$rs$$: $\pi _{\text{m,rs}}=\frac{\partial q_{\text{m}}}{\partial \beta _{\text{rs}}}$
Source:
PAC, 1999, 71, 1919. (Glossary of terms used in theoretical organic chemistry) on page 1924 [Terms] [Paper]