Angular distributions ofN2(2σu)−1photoelectrons including the effects of coupling to theN2(3σg)−1channel

We have performed a fixed-nuclei two-state coupled-channel calculation for the photoionization of ${\mathrm{N}}_2$ leading to the ${\left(2\mathrm{}{\sigma }_u\right)}^{-1\mathrm{}} B{}_{}{}^2{}_{}{}^{}\Sigma _u^{+}{}_{}{}^{}$ and ${\left(3\mathrm{}{\sigma }_g\right)}^{-1\mathrm{}} X{}_{}{}^2{}_{}{}^{}\Sigma _g^{+}{}_{}{}^{}$ states of ${\mathrm{N}}_2^{+}$, using the Padé-approximant $\tilde{C}$-functional formalism. We have found quantitative agreement with vibrationally unresolved experimental data for the photoelectron asymmetry parameter. Of particular interest is the good agreement of the asymmetry parameter in the ${\left(2\mathrm{}{\sigma }_u\right)}^{-1\mathrm{}}$ channel in the photon energy range of 25-35 eV where there are strong channel-coupling effects due to the shape resonance in the ${\left(3\mathrm{}{\sigma }_g\right)}^{-1\mathrm{}}$ channel.