Core photoionization of the argon dimer in the photon-energy range of 255–340 eV studied by a photoelectron-photoion-photoion coincidence technique

摘要

Single-photon multiple ionization of the argon dimer van der Waals complex, Ar_2, is studied by the photoelectron-photoion-photoion coincidence technique using synchrotron radiation in the photon-energy range of 255–340 eV, which covers the Ar 2p and Ar 2s ionization continua. Dissociation processes into Ar~+ + Ar~+, Ar~+ + Ar~(2+), Ar~+ + Ar~(3+), and Ar~(2+) + Ar~(2+) ion pair channels are observed. The Ar~+ + Ar~+ and Ar~+ + Ar~(2+) channels show the most intense ion-ion coincidences, compared to other observed dissociative channels. For the four observed channels the intensities are integrated and compared as functions of photon energy.