Differential charge exchange cross sections in AB+–AB collisions

Abstract

Differential cross sections for vibrational excitation in H+2(X 2Σ+g, ν0′) –H2(X 1Σ+g, ν0″), N+2(X 1Σ+g, ν0′) –N2(X 1Σ+g, ν0″), O+2(X 2Πg, ν0′) –O2(X 3Σ−g, ν0″), CO+(X 2Σ+, ν′0) –CO(X 1Σ+, ν0″), and NO+(X 1Σ+, ν0′) –NO(X 2Πr, ν0″) charge transfer reactions have been determined for incident ions with 0.004 to 2.2 keV kinetic energies. Differential cross sections for excitation of individual charge transfer channels have been computed as a function of scattering angle using a multistate impact parameter treatment of the collision processes. At low kinetic energies, coverged cross sections are obtained with the inclusion of a relatively small number of product vibrational states in the wavefunction expansion of the system while a large number of product states must be included at higher energies. Small angle scattering within several degrees dominates the charge transfer, with the scattering becoming more concentrated in the forward direction at higher kinetic energies.

Multiquantum Vibrational Deactivation of N2+(v) by Collisions with N2 and O2 at Thermal Energies

“…For reference, at higher collision energies ( E c.m. > 1 eV), there have been several studies of multiquantum T → V excitation for the N 2 + + N 2 system. − Another violation of the Δ v = −1 rule was observed for the N 2 + ( v = 2) + O 2 reaction, for which the vibrational deactivation (eq 2) is significantly more efficient than charge transfer (eq 1) and v = 2 → v = 1 and v = 2 → v = 0 processes were both shown to occur . The nature of multiquantum vibrational transfer in these systems is not fully understood with the limited experimental data.…”