Selective hyperfine excitation of N2H+ by He: Potential energy surface, cross sections, and propensity rules

摘要: We present potential energy surfaces for the He-N2H+ system adiabatically corrected zero-point motion along intermolecular stretching vibrations v1 = 0 and 1. The potentials are extended to shorter separations which makes them useful scattering calculations. Close coupling calculations of spinless S matrices rotational excitation N2H+ by He presented, recoupling techniques obtain collisional cross sections between hyperfine levels used. propensity rules investigated case where two nuclear spins involved. It is found that only well defined rule DeltaF DeltaF1 Deltaj required in order relative intensities two-spin sections.