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Frankfurt 2006 – scientific programme

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A: Atomphysik

A 10: Poster I: Wechselwirkung mit Elektronen und Ionen

A 10.9: Poster

Tuesday, March 14, 2006, 16:30–18:30, Labsaal

Channel-selective electron emission spectra from fragmentation of CO2 and H2 by fast proton impact. — •Christina Dimopoulou1, R. Moshammer1, A. Dorn1, D. Fischer1, C. Höhr1, J. Ullich1, M.E. Galassi2, R.D. Rivarola2, and P.D. Fainstein31MPI für Kernphysik, Heidelberg — 2Instituto de Fisica Rosario, Argentina — 3Centro Atomico Bariloche, Argentina

Dissociative ionization of H2 and CO2 by 6 MeV proton impact was studied in a reaction microscope. Channel-selective low-energy electron spectra were recorded, by measuring the momenta of the emitted electron and the recoil ionic fragment in coincidence. The data for CO2 are compared with a CDW-EIS calculation for molecular orbitals. A good qualitative agreement is observed even though the model does not account for the vibrational motion. The electron energy spectra show rich structure due to molecular excitation channels which undergo radiationless decay, via autoionization and predissociation [1]. The interference patterns recently observed in electron emission from ion- impact ionization of H2, in analogy to Young’s two-slit experiment [2], are predicted to be more pronounced if the orientation of the molecular axis could be fixed in space at the instant of the collision [3]. Experimentally, the dissociative ionization of H2 gave access to molecular-frame angular distributions of emitted electrons.They are compared with the CDW-EIS calculation [4].
C. Dimopoulou et al., J. Phys. B 38, 3173 (2005) [2] N. Stoltherfoht et al., Phys. Rev. Lett. 87, 023201 (2001) [3] G. Laurent et al., J. Phys. B 35, L495 (2002) [4] C. Dimopoulou et al., J. Phys. B 38, 593 (2005)

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