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photoelectron spectroscopy (PES) definition

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measures the ionization energies of molecules when electrons are ejected from different orbitals;  it uses these to infer the orbital energies.  UV photoelectron spectroscopy is for hitting more energetic molecules, and X-Ray photoelectron spectroscopy is handy for pulling off the core electrons.

See also:

pocket depth definition
photovoltaic detector definition
Photochemical Oxidants definition
plumbylenes definition
photoresist lifting definition