Berlin 2001 – wissenschaftliches Programm

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A: Atomphysik

A 5: Posters Tuesday (Photoionisation, Multi Photon Processes)

A 5.13: Poster

Dienstag, 3. April 2001, 12:30–15:00, AT3

Absolute cross section for photoionization of CO⁺ — •Torkild Andersen, Henrik Kjeldsen, Helge Knudsen, and Finn Folkmann — Institute of Physics and Astronomy, University of Aarhus, Denmark

The absolute cross section for photoionization of CO⁺ ions in their ground vibrational state, leading to longlived metastable CO²⁺ ions, has been measured from threshold to 55 eV utilizing a merged ion-photon setup with synchrotron radiation from an undulator. The continuum cross section near threshold has been determined to be 2.5(4)Mb, which is in agreement with an estimated cross section based on the absolute photoabsorption cross section for CO and the branching ratios for the decay of highly excited CO⁺ ions. Superimposed on the continuum cross section discrete structures are observed, which can be assigned to a specific CO⁺Rydberg series.