title: Fragmentation channels in dissociative electron recombination with hydronium and other astrophysically important species.
abstract: We report on our recent studies of dissociative recombination (DR) employing two different fragment imaging detection techniques at the TSR storage ring in Heidelberg, Germany. Principles of an upgraded 3D optical system and the new energy-sensitive multistrip detector (EMU) are explained together with possible applications in reaction dynamics studies. With the EMU imaging detector we succeeded to observe the branching ratios after DR of deuterated hydronium ions D(3)O(+) at energies of 0-0.5 and 4-21 eV. The branching ratios are almost constant at low energies while above 6 eV both oxygen-producing channels O + D + D + D and O + D(2) + D strongly increase and dominate by about 85% at 11 eV. To demonstrate further capabilities of our fragment imaging detectors, we also summarize some of our additional recent studies on DR of molecular ions important for astrophysics as well as for fundamental unimolecular dynamics.
authors.affiliation: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany. oldrich.novotny@mpi-hd.mpg.de
authors.forename: Oldrich
authors.initials: O
authors.lastname: Novotný
authors.forename: Henrik
authors.initials: H
authors.lastname: Buhr
authors.forename: Julia
authors.initials: J
authors.lastname: Stützel
authors.forename: Mario B
authors.initials: MB
authors.lastname: Mendes
authors.forename: Max H
authors.initials: MH
authors.lastname: Berg
authors.forename: Dennis
authors.initials: D
authors.lastname: Bing
authors.forename: Michael
authors.initials: M
authors.lastname: Froese
authors.forename: Manfred
authors.initials: M
authors.lastname: Grieser
authors.forename: Oded
authors.initials: O
authors.lastname: Heber
authors.forename: Brandon
authors.initials: B
authors.lastname: Jordon-Thaden
authors.forename: Claude
authors.initials: C
authors.lastname: Krantz
authors.forename: Michael
authors.initials: M
authors.lastname: Lange
authors.forename: Michael
authors.initials: M
authors.lastname: Lestinsky
authors.forename: Steffen
authors.initials: S
authors.lastname: Novotny
authors.forename: Sebastian
authors.initials: S
authors.lastname: Menk
authors.forename: Dmitry A
authors.initials: DA
authors.lastname: Orlov
authors.forename: Annemieke
authors.initials: A
authors.lastname: Petrignani
authors.forename: Michael L
authors.initials: ML
authors.lastname: Rappaport
authors.forename: Andrey
authors.initials: A
authors.lastname: Shornikov
authors.forename: Dirk
authors.initials: D
authors.lastname: Schwalm
authors.forename: Daniel
authors.initials: D
authors.lastname: Zajfman
authors.forename: Andreas
authors.initials: A
authors.lastname: Wolf