title: Photodissociation investigation of doubly charged ethanol clusters induced by inner-shell electron ionization.
abstract: Fragmentation of doubly charged ethanol clusters [(C(2)H(5)OH)(n)] following the O 1s ionization has been investigated by means of the photoelectron-photoion-photoion coincidence (PEPIPICO) method. The dominant fission channel of (C(2)H(5)OH)(n)(2+) was the formation of protonated cluster ion pairs [H(C(2)H(5)OH)(l)(+)/H(C(2)H(5)OH)(m)(+)]. The fragmentation mechanisms of these ion pairs were discussed based on the analysis of the PEPIPICO contour shape. It was clarified that the prominent fragmentation channel was a secondary decay mechanism, where neutral evaporation occurs after charge separation. On the other hand, the formation of small fragment ions was suppressed, excluding the formation of certain specific fragments (H(3)O(+), C(2)H(5)(+)/COH(+), and C(2)H(4)OH(+)). The formation of small fragment ions was suppressed due to the cooling effect caused by the neutral evaporation and the decrease in the electrostatic repulsive force caused by charge separation.
authors.affiliation: Japan Synchrotron Radiation Research Institute∕SPring-8, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan. tamenori@spring8.or.jp
authors.forename: Y
authors.initials: Y
authors.lastname: Tamenori
authors.forename: K
authors.initials: K
authors.lastname: Okada
authors.forename: K
authors.initials: K
authors.lastname: Tabayashi
authors.forename: A
authors.initials: A
authors.lastname: Hiraya
authors.forename: T
authors.initials: T
authors.lastname: Gejo
authors.forename: K
authors.initials: K
authors.lastname: Honma