C566lecture29_000

C566lecture29_000 - C566 Master Lecture Notes Lecture 29...

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1 C566 Master Lecture Notes Lecture 29 Note that what is on this figure represents the “zero-point” transitions, and that there are also vibrational and rotational energy spacings that can be reflected in the eKE’s. IP T 0 (A) T 0 (B) Neutral ground state Cation ground state and excited states The energy of the photon, h v , elevates the energy to the neutral, resulting in a cation plus electron, and the electron can have a number of different possible KE values, via eKE = h v – (E el + + E vib + + E rot + ) IP + T e (B) One photon gives one cation (with any allowed internal el, vib, rot energy) plus one free electron with the appropriate eKE. Making the measurement on 10 6 or so neutrals gives a full spectrum of electron kinetic energies. Electron KE falls in this range Q sym Anion ground state Neutral ground Neutral excited Anion PES hv Photodetach mass-selected, internally-cold negative ion using fixed frequency laser Energy analyze resulting photoelectrons e - KE = hv – [E 0 – E - ] One-electron transitions most intense FCF’s govern intensities of individual vibratinoal lines S = ½ Resolution ~0.007 eV at eKE = 0.5 eV
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This note was uploaded on 01/18/2012 for the course C 566 taught by Professor Carolinechickjarroll during the Spring '11 term at Indiana.

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C566lecture29_000 - C566 Master Lecture Notes Lecture 29...

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