Abstract
In this article, a method for high-resolution laser spectroscopy of ions—termed ZEro-Kinetic Energy spectroscopy (ZEKE)—is reviewed. Emphasis will be put on a more recent, mass-selective version (mass-analyzed ZEKE). A detailed description of the apparatus, designed and built at the Technische Universität München, will first be given. In a second part, we outline two applications which are particularly suited to illustrate the potential of the method. We hope to demonstrate to the mass spectrometry community the close connection between a ZEKE spectrometer and a conventional reflectron time-of-flight mass spectrometer (TOF-MS). Adding one single electrostatic field lens to the extraction field region of a TOF-MS allows to go far beyond mass analysis, distinguishing, for example, between isomeric structures or determining the geometric structure of molecular ions.
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