Cation transport in gaseous nitrogen: density and temperature effects

Abstract

The density-normalized mobility of nμ of cations in nitrogen gas at densities up to nc = 6.7 × 1027 molecules/m3 increases with temperature. At n ≤ 5.7 × 1025 molecules/m3 and T > 250 K, the dominating ion is N4+. At lower temperatures and higher densities, relatively loosely bound clusters N4+(N2), N4+(N2)2, … form. Momentum transfer cross sections for N4+–N2 are governed at low energies by the polarization potential, and at high energies by the hard body potential. The cross section for N2+–N2 at high energies is larger than that for N4+–N2.

Mobility of thermal cations in low density alkane gases

“…For N4+ in N2, a m at low collision energy 5 = M,c2/2 was equal to that of the simple polarization potential uPol, and at high 5 it was close to the hard sphere value for N2-N2 collisions (13). This behavior is expected from the Langevin model (14,15).…”

Density effects on ion mobilities in electron attaching fluids: CS2, SF6, and C6F6

“…In real systems the energy dependence of u , , usually results in n p increasing somewhat with increasing T a t constant n, except where charge transfer dominates, in which case n p decreases (1,32,33). In the present vapors the ions would be clustered with neutral molecules, which would increase their mass and tend to increase a , , and decrease n p .…”