An approach to the systematic neglect of the small-in-value electron repulsion integrals
which is used in a number of approximate self-consistent field molecular orbital
schemes. It means that all the products of atomic orbitals
are set to zero and the overlap integral
is the Kronecker delta). The ZDO
approximation greatly simplifies the computation of wavefunctions by eliminating
many of two-electron integrals. At the ZDO
approximation all three- and four-centered integrals vanish.
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook