Molecular Beam Measurements of Inelastic Cross Sections for Transitions Between Defined Rotational States (Jm) of CSF in Collisions with He, Ne, Aar Kr, and Xe, CH4, SF6, C2H6, N2, CO, CO2, N2O, Ch3Cl, Ch3Br, CF3H, and CF3Br

摘要

Absolute inelastic cross sections for rotational quantum state to state transitions were measured. Small angle grazing collisions of CsF molecules colliding with rare gas collision partners as well as with other scattering partners were studied. In the collision region the quantization axis of the CsF molecules is defined by a weak electric field (300 V/cm) directed perpendicular to the direction of the velocity selected CsF and the target nozzle beam. The apparatus, which uses electrostatic quadrupole fields to state select and state analyze the CsF molecules prior to and after scattering, is described. The formulas used to derive the various types of cross sections from the pressure dependences are derived. A transmission function for each rare gas and transition was calculated using a Monte Carlo method. Theoretical predicted differential cross sections were compared with the reported values. The cross sections were correlated with the predictions of a Born approximation theory for the various predominant potential terms.