Electron capture into then=3,4states of H by low -energyH+,H2+impact on gases

Abstract

Absolute cross sections for electron capture into the $n=3,4\mathrm{}$ states of H have been measured for 0.3-3.0-keV ${\mathrm{H}}^{+}$, ${\mathrm{H}}_2^{+}$ impact on ${\mathrm{H}}_2$, ${\mathrm{N}}_2$, Ar, C${\mathrm{O}}_2$. This cross section decreases exponentially with decreasing impact velocity according to an $\sigma =A\exp \left(\frac{-B\left|\Delta E\right|}{v}\right)$ relationship, where $\left|\Delta E\right|$ is the internal energy of the reaction, $v$ is the ion velocity, and $A$ and $B$ are constant.