Electron-Temperature Dependence of Electron-Ion Recombination in Neon

Abstract

A 3-mode microwave apparatus is used to determine electron-ion diffusion and recombination rates under conditions such that T + = r gas = 300°K and T e is varied from 300 to 11 000°K. A high-Q cavity mode is used to ionize the gas, a second high-Q mode is used to determine the electron density during the afterglow from the change of resonant frequency of the cavity, and a nonresonant waveguide mode is used to apply a constant microwave heating field to the electrons. At 7\,=300°K and p(Ne) =20 Torr, a value a(Ne 2 + ) = (1.7 dz0.1)Xl0~7 cm 3 /sec is obtained from analysis of the recombination-controlled electron density decays, using a computer solution of the electron continuity equation to take into account ambipolar diffusion effects. This value is in very good agreement with corrected values obtained by several other investigators. Using the same procedures, a variation of a(Ne 2 f ) as T e~°A Z is found to be accurately obeyed over the range 300°K^ T«^ 11 000°K, suggesting that the initial capture step is rate-limiting in the dissociative recombination process.

Electron Temperature Dependence of the Dissociative Recombination Coefficient of Molecular Argon Ions Ar+2 with Electrons

“…Frommhold and Biondi [2,12] and described in our previous paper Mikuš et al [13] in more detail. The method consists of measuring the detuning Δf of a microwave cavity oscillating in the T M 010 mode during the afterglow period of the pulsed d.c. discharge with the discharge tube placed in the cylindrical cavity to measure electron density decay in its afterglow period.…”

Collisional-radiative ionization and recombination coefficients for quasi-stationary homogeneous hydrogen and hydrogenic ion plasmas

“…In the Eqs. (21) to (24) we have therefore to put qSl=nz_l, l for the final evaluation. To become free of the quantity q51, we write the Eqs.…”

Study of the Temperature Dependence of Electron-Ion Recombination in Nitrogen

“…As.a consequence, many of the previous recombination studies may not apply to the ion assumed to be present, e.g., N2 + , leading to much confusion in the literature. [7][8][9][10][11][12][13] In several of the reported nitrogen recombination studies 11 " 15 the measurements have been extended over a range of temperatures. Most of these studies were conducted without the benefit of mass analysis or any a priori knowledge concerning the identity of the dominant ion species.…”