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Fragmentation of molecular ions in slow electron collisions


Novotny,  Steffen
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Novotny, S. (2008). Fragmentation of molecular ions in slow electron collisions. PhD Thesis, Ruprecht-Karls Universität, Heidelberg.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-7928-E
Fragmentation of molecular ions in slow electron collisions The fragmentation of positively charged hydrogen molecular ions by the capture of slow electrons, the so called dissociative recombination (DR), has been investigated in storage ring experiments at the TSR, Heidelberg, where an unique twin-electron-beam arrangement was combined with high resolution fragment imaging detection. Provided with well directed cold electrons the fragmentation kinematics were measured down to meV collision energies where pronounced rovibrational Feshbach resonances appear in the DR cross section. For thermally excited HD+ the fragmentation angle and the kinetic energy release were studied at variable precisely controlled electron collision energies on a dense energy grid from 10 to 80 meV. The anisotropy described for the first time by Legendre polynomials higher 2nd order and the extracted rotational state contributions were found to vary on a likewise narrow energy scale as the rotationally averaged DR rate coefficient. Ro-vibrationally resolved DR experiments were performed on H+ 2 produced in distinct internal excitations by a novel ion source. Both the low-energy DR rate as well as the fragmentation dynamics at selected resonances were measured individually in the lowest two vibrational and first three excited rotational states. State-specific DR rates and angular dependences are reported.