arXiv subjects

A. L. Landers

Publications and source records attributed to A. L. Landers.

3 recordsLinked to original sources

arXiv2014

Ion-momentum imaging of dissociative electron attachment dynamics in acetylene

We present experimental results for dissociative electron attachment to acetylene near the 3 eV $^2Π_g$ resonance. In particular, we use an ion-momentum imaging technique to investigate the dissociation channel leading to C$_2$H$^-$ fragments. From our measured ion-momentum results we extract fragment kinetic energy and angular distributions. We directly observe a significant dissociation bending dynamic associated with the formation of the transitory negative ion. In modeling this bending dynamic with \emph{ab initio} electronic structure and fixed-nuclei scattering calculations we obtain good agreement with the experiment.

physics.chem-ph↗

arXiv2013

Dissociative electron attachment to carbon dioxide via the ^2Π_u shape resonance

Momentum imaging measurements from two experiments are presented and interpreted with the aid of new ab initio theoretical calculations to describe the dissociative electron attachment (DEA) dynamics. We address the problem of how the 4 eV ^2Π_u shape resonance in CO_2 proceeds to dissociate to CO(^1Σ^+) + O^-(^2P) by DEA.

physics.chem-ph↗

arXiv2010

Auger decay of 1σg and 1σu hole states of N2 molecule: disentangling decay routes from coincidence measurements

Results of the most sophisticated measurements in coincidence of the angular resolved K-shell photo- and Auger-electrons, and of two atomic ions produced by dissociation of N2 molecule, are analyzed. Detection of photoelectrons at certain angles allows separating the Auger decay processes of the 1σg and 1σu core hole states. The Auger electron angular distributions for each of these hole states are measured as a function of the kinetic energy release of two atomic ions and are compared with the corresponding theoretical angular distributions. From that comparison one can disentangle the contributions of different repulsive doubly charged molecular ion states to the Auger decay. Different kinetic energy release values are directly related to the different internuclear distances. In this way one can trace experimentally the behavior of the potential energy curves of dicationic final states inside the Frank-Condon region. Presentation of the Auger electron angular distributions as a function of kinetic energy release of two atomic ions opens a new dimension in the study of Auger decay.

physics.atom-ph↗