Ion Dipole Capture Cross Sections at Low Ion and Rotational Energies; Comparison of Integrated Capture Cross Sections with Reaction Cross Sections for NH3 and H2O Parent-Ion Collisions

Abstract

Numerical capture cross sections calculated for CH₃CN⁺+CH₃CN collisions for a rotational temperature T_R of 77°K are in the range 1000–3500 Ų. Comparisons of capture cross sections (integrated over experimental ion energies) for H₂O and NH₃ at $T_R\text{≈ 300°}\mathrm{K}$ are in mixed agreement with experimental data from (1) a conventional mass spectrometer and (2) an ion cyclotron resonance device.