M. Schoeffler

Single ionization of Helium at 0.5-2 MeV proton impact: On the quest for projectile coherence effects

J. Gatzke, F. Navarrete, M. Ciappina, H. Gatzke, O. Chuluunbaatar, S. A. Zaytsev, A. A. Bulychev, K. A. Kouzakov, A. Galstyan, M. Waitz, H.-K. Kim, T. Bauer, A. Laucke, S. Eckart, G. Kastirke, J. Müller, M. Ritzer, E. Bloch, M. Richter, K. Fehre, M. Kunitski, Ch. Müller, J. Voigtsberger, J. Rist, K. Pahl, M. Honig, M. Pitzer, M. Weller, I. Vela Pérez, J. Hoehl, G. Nalin, S. Grundmann, H. Maschkiwitz, C. Janke, S. Zeller, C. Goihl, Y. Herrman, D. Trabert, T. Jahnke, L. Ph. H. Schmidt, Yu. V. Popov, R. Dörner R. O. Barrachina, and M. S. Schöffler 1

Dissociation Dynamics and Molecular Imaging of Methane following Photoionization at the Carbon K-Edge

We have used Cold Target Recoil Ion Momentum Spectroscopy (COLTRIMS) to measure the momenta of the photoelectron and the molecular fragments arising from the dissociation of methane following core photoionization and subsequent Auger decay.

Dynamic modification of the fragmentation of autoionizing states of O{sub 2}{sup +}

The dynamic process of fragmentation of excited states of the molecular oxygen cation is investigated in a two-part study. First, using monochromatic 41.6 eV radiation and cold-target recoil-ion momentum spectroscopy detection of O{sup +} + O{sup +} ion pairs and associated electrons, we establish that this channel is populated only by an indirect process enabled by autoionization of excited oxygen atoms and identify the final active potential curves. Second, we probe the dynamics of this process using an attosecond pulse train of 35-42 eV EUV followed by an intense IR laser pulse. The results are compared with a model calculation.