I. Korolov

The recombination of D+3 and D+ 5 ions with electrons in deuterium containing plasma

The recombination of D+3 and D+5 ions with electrons in a He–Ar–D2 flowing afterglow plasma is reported. Low temperature (T = 130–300 K) and high pressure of the He buffer gas (900–1200 Pa) was used to enhance the formation of D+5 ions in the afterglow plasma. The deuterium partial number density was varied over a large range ([D2] = 1 × 1012–3 × 1015 cm−3) to study its influence on plasma decay. At low [D2], D+3 ions dominate in the afterglow and the plasma decay is controlled by the recombination of D+3 ions (rate coefficient α3). At high [D2] and lower temperatures, D+5 ions are effectively formed and the plasma decay is controlled by the recombination of D+5 ions (α5). In the intermediate region, the rate of recombination is given by the partial densities of both ions, D+3 and D+5. These partial densities are influenced by conditions in the plasma and they are controlled by ion–molecule reactions (D+3 + D2 ↔ D+5). If the ion–molecule reactions are fast in comparison with the recombination processes the plasma decay can be characterized by the equilibrium constant KC and by recombination rate coefficients α3 and α5. By monitoring of the plasma decay, all three constants α3 (190 K) = (1.4 ± 0.5) × 10−7 cm3 s−1, α5 (190 K) = (3 ± 1) × 10−6 cm3 s−1 and KC (190 K) = (3.8 ± 2.0) × 10−16 cm3 are determined.

Binary and ternary recombination of and ions with electrons in low temperature plasma

Measurements of recombination rate coefficients of binary and ternary recombination of and ions with electrons in a low temperature plasma are described. The experiments were carried out in the afterglow plasma in helium with a small admixture of Ar and parent gas (H2 or D2). For both ions a linear increase of measured apparent binary recombination rate coefficients (αeff) with increasing helium density was observed: αeff = αBIN + K He[He]. From the measured dependencies, we have obtained for both ions the binary (αBIN) and the ternary (K He) rate coefficients and their temperature dependence. For the description of observed ternary recombination a mechanism with two subsequent rate determining steps is proposed. In the first step, in + e− (or + e−) collision, a rotationally excited long-lived Rydberg molecule (or ) is formed. In the following step (or ) collides with a He atom of the buffer gas and this collision prevents autoionization of (or ). Lifetimes of the formed (or ) and corresponding ternary recombination rate coefficients have been calculated. The theoretical and measured binary and ternary recombination rate coefficients obtained for and ions are in good agreement.

Measurements of EEDF in recombination dominated afterglow plasma

Electron energy distribution functions (EEDF) have been measured in decaying plasma in Flowing Afterglow Langmuir Probe (FALP) experiment. The measurements have been carried out in diffusion and recombination governed plasmas used for studies of recombination of KrD+ and H3+ ions.

Binary and ternary recombination of D{sub 3}{sup +} ions with electrons in He-D{sub 2} plasma

An experimental study is reported about the recombination of

Near infrared second overtone cw-cavity ringdown spectroscopy of D2H+ ions

\text{D}_{3}{}^{+}

Non-Maxwellian electron energy distribution function in He, He/Ar, He/Xe/H2 and He/Xe/D2 low temperature afterglow plasma

ions with electrons in a low-temperature plasma (200\char21{}300 K) consisting of He with a small admixture of

Measurements of EEDF in helium flowwing afterglow at pressures 500 - 2000 PA

{\text{D}}_{2}

Recombination of HCO+ and DCO+ ions with electrons

. At several temperatures, the pressure dependence of the apparent binary recombination rate coefficient

Recombination of KrH+ and XeH+ ions with electrons in low temperature plasma

({\ensuremath{\alpha}}_{\text{eff}})

Recombination of KrD+ and XeD+ ions with electrons

was measured over a broad range of helium pressures (200\char21{}2000 Pa). The binary and ternary recombination rate coefficients were obtained from measured pressure dependences of