ArticleRapid communications in mass spectrometry : RCM2026
Hybrid CFD-DSMC Simulation of Ion Transport in Photoionization Mass Spectrometry: From Atmospheric Pressure to High Vacuum.
Article in Rapid communications in mass spectrometry : RCM, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
rationaleThe ion motion within a mass spectrometer is governed by the coupling of gas dynamics and electric fields. Therefore, a comprehensive understanding of ion transport from atmospheric pressure to the high-vacuum mass analyzer is crucial.
methodsIn this work, a hybrid computational fluid dynamics-direct simulation Monte Carlo (CFD-DSMC) strategy was employed to accurately resolve the cross-scale flow fields spanning from the continuum to the rarefied regime in the mass spectrometer. Subsequently, a multiphysics model integrating gas dynamics, electric fields, and ion trajectories was developed to achieve high-precision predictions of ion transport behavior.
resultsTo validate the accuracy of the theoretical simulation, ion transmission efficiencies of acetone and toluene were experimentally measured using a homemade low-pressure photoionization time-of-flight mass spectrometer (LPPI-TOF-MS). The experimental results demonstrated a strong correlation with the simulation predictions, achieving a maximum Pearson correlation coefficient (r) of 0.96 for toluene and 0.90 for acetone in the radio-frequency-only quadrupole (RFQ) region, confirming the model's reliability.
conclusionsThis study provides a robust theoretical tool for elucidating ion transport mechanisms and guiding the optimization of ion optics in mass spectrometers.
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