Abstrakt

In the present communication, we present results on the photo-double-ionization and fragmentation of the isoxazole molecules. The experiments were carried out at the CiPo beamline at the Elettra-Sincrotrone radiation facility exploiting the VUV excitation and the ion time-of-flight spectrometry combined with the PEPICO technique. The dissociative processes where only one electron is emitted are quite well known [1]. However, double ionization is a more complex mechanism producing the doubly charged parent ion after two correlated electrons' emission. These doubly charged ions are usually very reactive objects that can dissociate into the ionic fragments. PEPICO method gives the coincidence maps plotted as the first ion arrival time vs. the second ion time-of-flight, with reference to the detection of one of the photoelectrons (see Figure 1a). As a result, the pairs of correlated ions show up as areas with a higher density of points. The calculation of the coincidence events in these “islands” gives information about the particular fragmentation channel (see Figure 1b).

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