Lect+33+08 - Chapter 6 Common language discussion of Naming...

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Chapter 6 Common language discussion of Naming Molecular Orbitals Molecular Orbitals in H 2 + : the one electron case Molecular Orbitals in Diatomic Molecules: multiple electrons Correlation diagrams, bond order, and magnetic properties Bonding in Linear and Bent Triatomics
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Born-Oppenheimer Approximation Electron motion is much faster than nuclear motion. “frozen nuclear positions” Worst case is for hydrogen molecule - Electron orbital time in hydrogen ~ 0.1 fs, 0.1 x 10 -15 s H 2 vibrational time ~ 8 fs Born approximation treats the nuclei as “frozen” relative to the electron motion GOOD approximation Uncouples the nuclear motion from the electron motion and lowers the dimensionality of the Schroedinger equation which needs to be solved to get the energies
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Naming Molecular Orbitals 2200 σ - angular momentum = 0 Bond along internuclear axis 2200 π - angular momentum = 1 = ±h/2 π Bond above and below inter-nuclear axis Superscript “ * ” antibonding orbital
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