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CPP 26: Frontiers in Electronic-Structure Theory - Focus on Electron-Phonon Interactions II (joint session O/CPP/DS/HL)
CPP 26.8: Vortrag
Montag, 16. März 2020, 16:45–17:00, GER 38
Multipole Polarizabilites of Positronium and Its Interaction with Atoms and Molecules — •Jorge Charry, Dmitry Fedorov, and Alexandre Tkatchenko — University of Luxembourg, 1511 Luxembourg, Luxembourg
Positron – the antiparticle of the electron – has many intriguing fundamental properties and it is also useful in many applications for probing matter. Besides electron-positron annihilation, metastable states of atomic and molecular systems involving binding between electrons and positrons are of great interest . In addition, electrons and positrons can form positronium (Ps) atoms and even larger clusters. The polarization of positron by a residual ion is one of possible mechanisms for the formation of bound states for positron-based chemistry . An accurate description of the polarizability of Ps and its bound state with atoms and molecules is essential to understand such interactions. Here, we extend the direct transition-matrix approach, proposed by Kharchenko to determine the multipole polarizabilities of the hydrogen atom , to the case of finite nuclear mass. The obtained analytical results, which are in agreement with our numerical calculations performed by means of the molecular orbital based method , show that Ps has unique properties in comparison to other normal atoms. Our results shed light into the fundamental interactions between matter and antimatter.  Gribakin et al., Rev. Mod. Phys. 82, 2557 (2010);  Bromley and Mitroy, J. Phys.: Conf. Series 199, 012011 (2010);  Kharchenko, Annal. Phys. 355, 153 (2015);  Reyes et al., Int. J. Quant. Chem. 119, 1 (2019)