Qingyi Zheng

A CombinedChemical Ionization and Photoelectron IonizationSource for TOFMS: Application to Online Detection of Aldehydes inEnd-Tidal Exhaled Breath

Abstract In conventional exhaled breath analysis, a CO2 sensor is typically deployed separately from a biomarker detection instrument. Herein, we developed an all-in-one ionization source that integrates chemical ionization (CI) and photoelectron ionization (PEI) within a single...