%0 Journal Article %1 WOS:000075573100020 %A da Silva, EP %A Germano, JSE %A Lino, JLS %A de Carvalho, CRC %A Natalense, APP %A Lima, MAP %C PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS %D 1998 %I ELSEVIER SCIENCE BV %J NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS %K annihilation; positron-molecule scattering} {positron; %N 1-2 %P 140-148 %R 10.1016/S0168-583X(98)00282-1 %T Annihilation dynamics of positrons in molecular environments %V 143 %X We present recent results for positron-molecule scattering obtained with the Schwinger multichannel method. Our calculations include integral, differential and momentum transfer cross sections and the annihilation parameter Z(eff) for C2H2 and C2H4 molecules. We discuss a mechanism for annihilation of positrons in low-energy positron-molecule scattering. We interpret the annihilation process through virtual electronic excitation of the target combined with electronic cloud relaxation and virtual positronium formation. We study the influence of the first electronic state of the target on the cross section and on the annihilation parameter in e(+)-C2H2 scattering. (C) 1998 Elsevier Science B.V. All rights reserved.

@article{WOS:000075573100020, abstract = {We present recent results for positron-molecule scattering obtained with the Schwinger multichannel method. Our calculations include integral, differential and momentum transfer cross sections and the annihilation parameter Z(eff) for C2H2 and C2H4 molecules. We discuss a mechanism for annihilation of positrons in low-energy positron-molecule scattering. We interpret the annihilation process through virtual electronic excitation of the target combined with electronic cloud relaxation and virtual positronium formation. We study the influence of the first electronic state of the target on the cross section and on the annihilation parameter in e(+)-C2H2 scattering. (C) 1998 Elsevier Science B.V. All rights reserved.}, added-at = {2022-05-23T20:00:14.000+0200}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, author = {da Silva, EP and Germano, JSE and Lino, JLS and de Carvalho, CRC and Natalense, APP and Lima, MAP}, biburl = {https://www.bibsonomy.org/bibtex/234a988c3105b74930e96d945ee68d35e/ppgfis_ufc_br}, doi = {10.1016/S0168-583X(98)00282-1}, interhash = {201f0c8c55ecc682d576db26e2a0ea0a}, intrahash = {34a988c3105b74930e96d945ee68d35e}, issn = {0168-583X}, journal = {NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS}, keywords = {annihilation; positron-molecule scattering} {positron;}, note = {Workshop on Low Energy Positron and Positronium Physics, UNIV NOTTINGHAM, NOTTINGHAM, ENGLAND, JUL 15-18, 1997}, number = {1-2}, pages = {140-148}, publisher = {ELSEVIER SCIENCE BV}, pubstate = {published}, timestamp = {2022-05-23T20:00:14.000+0200}, title = {Annihilation dynamics of positrons in molecular environments}, tppubtype = {article}, volume = 143, year = 1998 }