What are the advantages of PTR-MS compared to conventional mass spectrometry?
PTR is a soft chemical ionization process, which means that in contrast to electron impact or charge transfer ionization the fragmentation rates can be kept very low. Therefore absolute concentrations can be derived immediately. In addition, common compounds of ambient air do not get ionized, which makes mass spectra easily interpretable and accounts for very low online detection limits in the pptv-range. Learn more…
