Effect of Molecular Additives on Electron Mobility and Electron−Ion Recombination Rate Constant in Dense Gaseous Krypton

Abstract

The rate constant of bulk electron−ion recombination is calculated for dense gaseous krypton doped with CH4 and N2. In the calculations, the electron scattering is modeled by experimental, energy-dependent collision cross sections. The applicability of the assumed cross sections is verified by calculations of the electron mobility in Kr/CH4 and Kr/N2, which give a reasonable agreement with experiment. For both Kr/CH4 and Kr/N2, the recombination rate constant is found to increase with increasing concentration of the molecular species, due to efficient dissipation of electron energy in vibrationally and rotationally inelastic collisions. The simulation results are compared with experimental data, which also demonstrate an enhancement of the recombination rate by molecular additives.

Study of ionization signals in a TPC filled with a mixture of liquid Argon and Nitrogen

“…However, the latter was reported to show opposite behaviour, at least for small Nitrogen concentrations (below 1%) [6]. Detailed theoretical calculations were recently made for dense gaseous mixtures of Krypton and Nitrogen [18]. These calculations show a strong dependence of the recombination rate term on the Nitrogen concentration up to 5 mol.%, very similar to the one we observed.…”

Operator algebraic methods in the theory ofdiffusion‐influencedreaction kinetics

“…Compared to the well‐known Braun's expression, 45 as corrected by Wojcik and Tachiya, 46 and the expression derived by Seki and Wojcik, 47 the expression for in Equation (149) provides overall more reliable estimates for the charge separation probability for all parameter values 48 . It also applies to the cases in which the interaction between the geminate particles is given by arbitrary central potential energy.…”

“…In this section, the effects of external electric field and anisotropic long‐range reactivity on the recombination dynamics of a geminate charge pair are considered. This problem was first considered by Onsager, 43 and has been investigated intensively, especially in an effort to design more efficient solar cells 44–49 …”

Simulation of Charge Carriers in Organic Electronic Devices: Methods with their Fundamentals and Applications

“…In fact, the apparent rate coefficients k were found to depend on charge density (including n and p ), disorder, morphology, electric fields, and the presence of heterojunctions. [ 118,119,121,122,167 ] Though there are analytic expressions [ 168–172 ] that emerge from the theory of encounter, essentially based on Onsagers work [ 173 ] and on recent findings of Burke et al., [ 174 ] their use is, strictly speaking, limited to participating materials that are isotropic and homogeneous. Possible alternatives are empirical rate expressions, provided that they are justified for material and morphology in question.…”