STUDIES OF THE TEMPERATURE DEPENDENCE AND EXCITATION OF THE PRODUCTS OF DISSOCIATIVE ELECTRON RECOMBINATION OF $N_{2}H^{+}$ AND $HCO^{+}$ IONS

TL;DRAbstract

The dissociative recombination (DR) rate constants of $N_{2}H^{+}/N_{2}D^{+}$ and $HCO^{+}$ ions with electrons have been measured as a function of temperature (100 - 500 K) using the Flowing Afterglow Langmuir Probe (FALP) technique. $N_{2}H^{+}$ and $HCO^{+}$ ions are two of the most abundant ions detected in the interstellar medium. The results cannot be expressed either by the power law $T^{-0.5}$ of the direct DR mechanism or the power law $T^{-1.5}$ of the indirect DR mechanism. In order to further understanding of the results, a study of the vibrational state distributions of the $N_{2}(B^{3}\\Pi_{g})$ electronically excited products for the $N_{2}H^{+}$ and $N_{2}D^{+}$ recombinations at 100 K has been carried out using an atmosphheric pressure monochromator. Comparison has been made with previous results obtained at $300 K^{a}$. The substantial enhancement of the vibrational level $(\\nu^{\\prime} = 6)$ detected from the $N_{2}B$ state for $N_{2}H^{+}$ recombination over $N_{2

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