Berlin 2014 – scientific programme
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A: Fachverband Atomphysik
A 27: Poster: Photoionization
A 27.3: Poster
Tuesday, March 18, 2014, 16:30–18:30, Spree-Palais
PIPE - Absorption Spectroscopy of Small Molecular Ions — •Stephan Klumpp1, Karolin Mertens1, Michael Martins1, Jonas Hellhund2, Stefan Schippers2, and Alfred Müller2 — 1Institut für Experimentalphysik, Universität Hamburg — 2Institut für Atom- und Molekülphysik, Universität Giessen
The Photon-Ion-Spectrometer at PETRA III (PIPE) at the XUV beamline P04, DESY, is a permanent end station dedicated to spectroscopic studies of free ions of various types, as atoms, molecular ions or mass selected clusters.
Using the merged-beams technique the prepared ion beam is collinear overlapped with x-ray photons from the P04 beamline between 250eV and 3000eV. This enables us to perform at PIPE absorption spectroscopy on the absolute scale in the region of the various inner shell absorption edges.
As a first case study for molecular ions the x-ray absorption and fragmentation of the IH+ molecular ion at the Iodine 3d edge has been investigated. By comparing the IH+ 3d partial cross section with the corresponding I+ cross section strong deviations in the ion yield as well as in the shape of the partial cross section is found.