Photoelectron Spectroscopy of Carbonyls. Biological Considerations
Ultraviolet photoelectron spectroscopy (UPS) has had enormous impact on chemistry. It is assured that it will have comparable influence on molecular biology. The reasons are straightforward: First, the UPS measurement technique2 is simple and direct; second, a great deal of interpretive ease is guaranteed by Koopmans1 theorem3; and, third, because of Koopmans’ theorem, the UPS data relate in a straightforward way to a very basic electronic structure concept, namely the canonical molecular orbital.
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