Hexapole State-Selection and Beam Focus of Polar Top Molecules

Abstract

We express a description of the state-selection role for a polarmolecule in a hexapole electrostatic field. By a quantum mechanicaltreatment of the molecular Stark energy and a classical mechanicaltreatment for the molecular trajectory in the field, we present thecalculated results of the different molecular rotational stateselection and beam focus and discuss the influence of the high orderStark effect, the beam speed on the results for the symmetric topmolecule CH3CN, CH3I, and the asymmetric top moleculeCH2F2 in the hexapole field. The method established andresults obtained can be taken as a guide for hexapole state selectionand beam focus of polar top molecules.