Positron–electron correlation‐polarization potential model for positron binding in polyatomic molecules
Yutaro Sugiura, Haruya Suzuki, Takuma Otomo, Takaaki Miyazaki, Toshiyuki Takayanagi, Masanori Tachikawa
Abstract
Positron binding energies (PBEs) of 41 polyatomic molecules were calculated using the positron-electron correlation-polarization potential (CPP) approach and compared with experimentally measured values. In this approach, the short-range positron-electron potential is modeled using the density-functional expression, whereas the long-range potential is approximated by the attractive polarization potential. The positron-electron CPP model based on local-density approximation yields larger PBEs than experimental values; however, the calculated values can be substantially improved by introducing generalized gradient approximation. We also investigated the conformational dependence of PBEs for representative molecules.