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S15_NME220_Lecture16_Bonding3

S15_NME220_Lecture16_Bonding3 - Lecture 16 Intro to...

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Lecture 16: Intro to chemical bonding 3 and Intro to AFM 1 Prof. James M. Carothers May 18, 2015 S15 NME 220
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Chemical bonding 3 and AFM 1 Goal: Understand the origin of molecular charge-distribution properties and introduce AFM as a technique for analyzing molecular surfaces Heteronuclear diatomic molecules Charge-distribution properties Dipole moment Induced dipole moment Dielectric constant Non-covalent forces Potential energy functions Repulsive force AFM Observing surfaces Piezo devices Work 3 problems in slides by Wed 5/20 at 12:30pm for bonus points
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Heteronuclear diatomic molecules Dipole moments can arise in heteronuclear molecules because the contributing AOs do not enter the MO with equal weights Heteronuclear diatomic molecules: Ψ = c 1 ψ 1 + c 2 ψ 2 c 1 / c 2 ≠ ± 1 Polarity in the bond arises because: If ψ 1 c ontributes more to Ψ than ψ 2 does, ( c 1 > c 2 ), electron in the MO spends more time around nucleus 1 than around nucleus 2.
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Charge-distribution properties – Dipole moment Dipole moment describes the asymmetry of charge on a molecule and can be calculated from the wave function for the particle.
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