Electron Energy Dependence of Regioselective Chloride Ion Loss

J. Am. Chem. Soc. 1999, 121, 2561-2570

2561

Electron Energy Dependence of Regioselective Chloride Ion Loss from Polychlorodibenzo-p-dioxins. Relationship between Resonance Electron Energies and Virtual Orbital Energies V. D. Berkout, P. Mazurkiewicz, and M. L. Deinzer* Contribution from the Department of Chemistry and EnVironmental Health Sciences Center, Oregon State UniVersity, CorVallis, Oregon 97331-7301 ReceiVed May 11, 1998

Abstract: Regiospecifically chlorine-37-labeled polychlorodibenzo-p-dioxins (PCDDs) undergo electron energydependent regioselective chloride ion loss when analyzed by electron capture negative ion mass spectrometry using an electron monochromator to supply the slow monoenergetic electrons. Three negative ion resonances, produced with electrons of energies