title: Probing isomers of the benzene dication in a low-temperature trap.
abstract: The structure of doubly ionized benzene has been spectroscopically studied for the first time. Helium-tagged complexes were prepared at temperatures below 4 K and analyzed using infrared predissociation spectroscopy. Double ionization of benzene yields primarily high-energy dications with a six-membered-ring structure. Some of the dications undergo rearrangement to a more stable pyramidal isomer with a C5H5 base and CH at the apex. By means of isomer-selective heating by a CO2 laser, infrared predissociation spectra of both the classical and pyramidal dications were obtained.
authors: Department of Organic Chemistry, Faculty of Science, Charles University in Prague , Hlavova 2030/8, 12843 Prague 2, Czech Republic.
authors: Juraj
authors: J
authors: Jašík
authors: Dieter
authors: D
authors: Gerlich
authors: Jana
authors: J
authors: Roithová