Photoelectron Spectroscopy (PES) A technique used to measure the binding energy of electrons in an...
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Transcript of Photoelectron Spectroscopy (PES) A technique used to measure the binding energy of electrons in an...
Photoelectron Spectroscopy (PES)
• A technique used to measure the binding energy of electrons in an atom or molecule.– As in the photoelectric effect, electrons are
emitted from an atoms or molecule by radiation from a photon of Enery (Ephoton = hν)
– The emitted electrons are captured and their kinetic energy is calculatied
– Binding energy = energy of photon –kinetic energy E electron = hν – KE
– The closer an electron is to the nucleus the higher its binding energy.
PES Instrument Basics
Photoelectron Spectra
• Each peak corresponds to removal of electrons from a different sublevel.
• The peaks are ordered: 1s, 2s, 2p, 3s, 3p, 3d, 4s etc.
Photoelectron
Spectra• Identify the
sublevel that corresponds to each peak
• Draw the corresponding Bohr model of each atom
Try these
• Zumdahl examples page 440