Abstract
The emission of two electrons from the valence shell of an atom or molecule by a single photon is due to electron correlation. This so-called double photoionization process has been studied extensively for atoms and smaller molecules using different experimental techniques. Here, we discuss double ionization of aromatic hydrocarbons using monochromatized synchrotron radiation over a wide range of photon energies in combination with the ion time-of-flight technique. In particular we will discuss the case of thiophene (C4H4S), which is a molecule of pentagonal structure similar to furan and selenophene.
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