Numerical Simulation and Experimental Study of a Dual‐Ionization Source (PI/EI) Quadrupole Mass Spectrometer Based on the CFD–DSMC Method

A DISQMS was developed and validated, and a multiphysics ion trajectory simulation framework was proposed to numerically optimize the instrument's sensitivity. It was demonstrated that complementary detection of organic and inorganic species is achieved through the dual-mode capability. Specifically, spectral interpretation and molecular structure elucidation are effectively facilitated by combining the detailed fragment-ion information from EI with the clean molecular ion data from PI.