ECC and direct ionization in positron–negative hydrogen ion collision

摘要: The dynamics of the electron capture to continuum (ECC) phenomenon is studied for first time positron–negative hydrogen ion (H−) system where an H− captured a low incident positron (e+), leaving behind residual neutral atom. calculations are performed in framework Coulomb distorted eikonal approximation (CDEA) as well with two other simplified models. triple differential cross sections (TDCS) ejected distribution double (DDCS) respect energy and emission angle studied. TDCS found be highly peaked at forward ejection when scattered share equally or almost (Ee ≈ Ep) available exit channel both post form prior interactions, indicating signature ECC. An asymmetric ridge-like structure also obtained present DDCS distribution. shows some interestingly different behaviour from that noted target, e.g., occurrence distinct sharp peak 45° nearly equal sharing between e e+, which could probably attributed presence one loosely bound target H−. For impact, due its small mass, ECC cusp has spread velocity space around , unlike heavy-ion impact. Some novel features ionic symmetric kinematics.