NeH+ dissociative recombination

Abstract

The rate coefficient for the NeH+ dissociative recombination (DR) with electrons was recently measured at the ASTRID storage ring in Denmark. The rate coefficient, as a function of the electron energy, is non-negligible at near-zero energy and displays two broad peaks between 10 and 30 eV. Both peaks are due to DR via Rydberg states converging to different dissociation limits of the NeH+ ion. The first one is due to the capture of the incoming electron by doubly excited Rydberg states dissociating in Ne (1s22s22p53s) + H(n ≥ 2 s, p). This series of Rydberg states converges to the core-excited ion state dissociating to Ne (3s) + H+. The second peak is due to the electron capture by Rydberg states dissociating to Ne (1s22s22p5 n ≤ 3 s, p) + H(1s). This series converges to the second ionization limit limit Ne+ + H(1s). We will report resonances found in the 10–30 eV energy range by electron scattering calculations using the Complex Kohn Variational method. The resonances, electronic couplings between resonances and the autoionization widths will be used in the time-dependent wave packet calculation describing the dissociation dynamics. The calculated cross sections and dissociation rates will be compared to the experimental ones measured by Mitchell et al.