Lecture 8 - Chem 4A F2008 Lecture 08Atomic Spectra...

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Unformatted text preview: Chem 4A F2008 Lecture 08Atomic Spectra Shielding IE 9/9/2008 Energy of Transitions En= - Z2 n2 R∞ R∞ = 2.18 x 10-18J R∞(N0) = 1312 kJmol-1 1312 ∆E= -Z2R∞ 1 nf 2 1 ni2 ni ∆ E = hν nf L8-1 © 2008 A. Pines M. Kubinec Spectroscopy ∞ 3 5 4 H-Atom, One-Electron Ions One-R∞ 9 IR Paschen VIS Balmer 3 2 λ ~ 657nm 4 2 λ ~ 487nm 5 2 λ ~ 435nm L8-2 2 -R∞ 4 UV Lyman 1 © 2008 A. Pines M. Kubinec -R∞ ChemQuiz© 8.1 © 2008 A. Pines M. Kubinec L8-3 © 2008 A.Pines M. Kubinec 1 Chem 4A F2008 Lecture 08Atomic Spectra Shielding IE Quantum States (Orbitals) n ∞ 3 2 Ionized 9/9/2008 E 0 -R∞ -R∞ 4 9 ℓ=0 3s 2s ℓ=1 1 ℓ=2 -2 -1 0 1 2 mℓ=-1 0 3p 3p 3p 2p 2p 2p 3d (5 orbitals) 1 Ground -R∞ 1s Notation: nℓmℓ L8-4 © 2008 A. Pines M. Kubinec Multi-Electron Atoms, Ions ℓ=0 ℓ=1 ℓ=2 Shielding 4s 3s 2s 1s © 2008 A. Pines M. Kubinec 4p 3p 2p 3d - + 2p 2s E(3d) > E(4s) 3d) 4s) E(2p) > E(2s) 2p) 2s) 1s L8-5 Ionization Energies, Shielding ∞ 3 2 H (kJ/mol) 328 1312 IE He+1s He (1s12) 1) He ((1s 2p (1s ∞ ∞ ∞ 6 3 4 4 2 3 3 2 2 ∞ Many-e-system One-e Many- - system One- 1 2372 5248 IE= IE= Z2 eff n2 R∞ 1 1 Φ 1 1 L8-6 © 2008 A. Pines M. Kubinec © 2008 A.Pines M. Kubinec 2 Chem 4A F2008 Lecture 08Atomic Spectra Shielding IE 9/9/2008 ChemQuiz© 8.2 © 2008 A. Pines M. Kubinec L8-7 ChemQuiz© 8.3 © 2008 A. Pines M. Kubinec L8-8 ChemQuiz© 8.4 © 2008 A. Pines M. Kubinec L8-9 © 2008 A.Pines M. Kubinec 3 ...
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