VITROCELL® Photonion Fast on-line measuring system for chemical gas analysis Photonion has developed a new on-line real-time measuring system for chemical gas analysis based on time-of-flight mass spectrometry (TOF-MS). This technology is now integrated in the VITROCELL modules in order to analyse the sampling at the spot where the cells are exposed. Three different ionization techniques are applicable: ○ single photon ionization (SPI) with a special VUV excimer source or laser VUV source ○ resonance enhanced multiphoton ionization (REMPI) with a laser beam ○ electron impact ionization (EI). SPI and REMPI are considered as soft ionization techniques allowing the acquisition of mass spectra with nearly no fragmentation. A heated transfer line allows direct gas analysis of e. g. engine exhaust , cigarette smoke or e-cigarette vapors. Gaseous samples are addressed continuously by the Photo-TOF-MS mass spectrometry system at a flow rate of approx. 2ml/min. Depending on the ionization technique various relevant species can be ionized by SPI, REMPI or EI. After the ionization, the formed ions are accelerated into the reflectron time-of-flight mass analyzer where they are separated due to their different mass to charge ratios. A typical TOF mass spectrum can be generated in some milliseconds.This fast on-line measurement system is a selective and sensitive analytical method to investigate complex gas mixtures such as from combustion processes. Unique flexible heated transfer line and customized sampling solution for the VITROCELL® exposure module. 170
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