Electronic excitation of ${\mathrm{N}}_{2}$ by positron impact

Electronic excitation of $N_{2}$ by positron impact

Puspitapallab Chaudhuri, Márcio T. do N. Varella, Claudia R. C. de Carvalho, and Marco A. P. Lima

Phys. Rev. A 69, 042703 – Published 2 April 2004

Abstract

We present cross sections of electronic excitation of nitrogen molecule $(N_{2})$ by positron impact using the Schwinger multichannel method. Our calculated cross sections are compared with the recent and the only available experimental data of Sullivan et al. [Phys. Rev. Lett. 87, 073201 (2001)]. Present theoretical results for excitation to the $a {}^{1}Π_{g}$ states do not reproduce the near-threshold structure observed in the experimental data.