104A Sp09 lecture 8 - 2 2 1 e M mv IE h + = ! ! + +...

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Molecular Orbital Theory Reading: DeKock and Gray, Chap 4 (but not 4-8) Miessler and Tarr, Chap 5
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M + h ! M + + e - h ! = IE + 1 / 2 mv 2 kinetic energy of electron typical energy for incident photon: 21.22 eV (HeI source) in gas phase: Photoelectron Spectroscopy (PES) -experimental method for measuring MO energies Koopman's theorem: IE is equal to the negative of the orbital energy: IE n = -E n . For multielectron atoms and molecules, this is approximately true. -spectra give electrons emitted vs. IE
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Photoelectron Spectroscopy hv electron Photoelectric effect (Einstein)
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Unformatted text preview: 2 2 1 e M mv IE h + = ! ! + + " + e M h M # Photoelectron Spectrometer (UV-PES) (UV-PES) Fine structure indicates substantial bonding or antibonding character in the MO. Energy Internuclear Distance H 2 Ground state molecule is typically in its lowest vibrational state. Upon ionization, H 2 + could be in a vibrationally excited state. ! ! + + " + + " + e hv e H hv H b g b g 1 2 2 2 ) ( ) ( # H 2 + Z eff Potential energy of 2s and 2p orbitals from Li to F...
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104A Sp09 lecture 8 - 2 2 1 e M mv IE h + = ! ! + +...

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