Studies of the Mechanism of Electron-Ion Recombination. I

摘要: Microwave, optical spectrometric, and interferometric techniques have been used to investigate the nature of electron-ion recombination process in low-pressure, pure helium afterglows at 300 77\ifmmode^\circ\else\textdegree\fi{}K. To determine whether dissociative capture electrons by molecular ions, i.e., ${{\mathrm{He}}_{2}}^{+}+e\ensuremath{\rightarrow}{\mathrm{He}}^{*}+\mathrm{He}+(\mathrm{KE})$, is reaction taking place, we attempted detect kinetic energy dissociation excited atoms produced a study widths emitted afterglow lines. A model low-pressure which reasonably accounts for our electron density, line intensity, linewidth observations involves principally creation ${\mathrm{He}}^{+}$ ions collisions pairs metastable atoms, three-body conversion ${\mathrm{He}}_{2}^{+}$ ambipolar diffusion ${\mathrm{He}}^{+}$, ${\mathrm{He}}_{2}^{+}$, electrons, walls. The $\ensuremath{\lambda}5876$ radiation ($3^{3}D\ensuremath{-}2^{3}P$ transition) from later part afterglow, when expected be source exhibits substantial broadening over approximately thermal width observed during discharge early originate impact excitation atoms. It concluded that likely broadening.