Linear polarization fractions of Fulcher- α fluorescence in electron collisions with H2

Abstract

We apply the molecular convergent close-coupling method to the calculation of linear polarization fractions for Fulcher-band fluorescence following electron-impact excitation of the ${\mathrm{H}}_{2}$ $d\phantom{\rule{0.16em}{0ex}}{}^{3}{\mathrm{\ensuremath{\Pi}}}_{u}$ state. The results exhibit the opposite threshold behavior compared to the only previous calculations [Meneses, Brescansin, Lee, Michelin, Machado, and Csanak, Phys. Rev. A 52, 404 (1995)], but are in agreement with the most recent measurements for the $Q(1),$ $R(1),$ and $Q(3)$ transitions [Maseberg, Bartschat, and Gay, Phys. Rev. Lett. 111, 253201 (2013)].