Abstract
We discuss some aspects of a simple expression for the low-energy dissociative recombination cross section that applies when the recombination process is dominated by the indirect mechanism. In most previous applications, this expression has been applied to capture into vibrationally excited Rydberg states with the assumption that capture is always followed by prompt dissociation. Here we consider the dissociative recombination of larger polyatomic ions and electrons. More specifically, we consider capture into electronically core-excited Rydberg states, and begin to assess its potential importance for larger systems.
Highlights
Dissociative recombination of an electron and molecular cation can occur via a direct mechanism involving capture into a dissociative electronic state of the corresponding neutral molecule, or via an indirect mechanism involving capture into a resonant, highly excited state of the neutral molecule, followed by predissociation of that state into neutral fragments [1,2,3,4]
We discuss some aspects of a simple expression for the low-energy dissociative recombination cross section that applies when the recombination process is dominated by the indirect mechanism
This expression has been applied to capture into vibrationally excited Rydberg states with the assumption that capture is always followed by prompt dissociation
Summary
EPJ Web of Conferences dissociative recombination cross section is in reasonable agreement with detailed calculations of the cross sections [13,14,15,16], even though the results of all of the calculations are a factor of 2–3 lower than the experimental values. This simple two-channel expression for the dissociative recombination cross section has been extended to a three-channel model [17] in which the contributions of both the direct and indirect mechanisms can be included together, along with the interactions between the two mechanisms. We use the simple expression for the dissociative recombination cross section along with information from photoabsorption and photoionization studies to begin to assess the potential importance of this process in larger molecular ions
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