Chemistry 125A: Freshman Organic Chemistry I - Lecture 11: Orbital Correction and Plum-Pudding Molecules - Professor J. Michael McBride
Lecture 11 : Orbital Correction and Plum-Pudding Molecules
The lecture opens with tricks ("Z-effective" and "Self Consistent
Field") that allow one to correct approximately for the error in using
orbitals that is due to electron repulsion. This error is hidden by
naming it "correlation energy." Professor McBride introduces molecules
by modifying J.J. Thomson's Plum-Pudding model of the atom to
rationalize the form of molecular orbitals. There is a close analogy in
form between the molecular orbitals of CH4 and NH3 and the atomic
orbitals of neon, which has the same number of protons and neutrons. The
underlying form due to kinetic energy is distorted by pulling protons
out of the Ne nucleus to play the role of H atoms.
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