Heidelberg 2015 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MO: Fachverband Molekülphysik
MO 11: Posters 2: Novelties in Molecular Physics
MO 11.3: Poster
Dienstag, 24. März 2015, 17:00–19:00, C/Foyer
Double Valence Ionization of Propadiene — •Miriam Weller1,2, Markus Schöffler1, Bishwanath Gaire2, Martin Richter1, Alexander Hartung1, Averell Gatton2,3, Sebastian Albrecht1,2, James Sartor3, Ben Berry4, Marko Härtelt5, Joshua Williams1, Till Jahnke1, Allen Landers3, Reinhard Dörner1, and Thorsten Weber2 — 1IKF, Goethe-Universität Frankfurt am Main, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany — 2LBNL, 1 Cyclotron Road, Berkeley, CA 94720, USA — 3Auburn University, Auburn, AL 36849-5311, USA — 4Kansas State University,116 Cardwell Hall, Manhattan, KS 66506, USA — 5NRC/uOttawa, 100 Sussex Drive, Ottawa ON K1A 0R6, Canada
Due to their structure, cumulenes of configurations as H2CnH2 (n≥2) are of high importance in a broad field of chemical processes like combustion, chemistry of atmosphere and interstellar media and also in more technical applications like nanomechanics and nanoelectronics.
We studied the breakup of propadiene (H2C3H2) after double ionization induced by 40 eV and 53 eV synchrotron radiation. A COLTRIMS reaction-microscope was used to measure the momenta of both the recoil ions and the two ejected electrons in coincidence. We were able to observe several breakup channels (H+/C3H3+; H2+/C3H2+; H3+/C3H+ and CH2+/C2H2+), different excited electronic states of the dication and angular distributions of the reaction products. Depending on the photon energy, different double ionization processes take place. At higher energies, a sequential channel opens which we assume to be delayed autoionization like previously observed in smaller molecules.