SEARCH Articles Figures Tables Mass transfer reaction Membrane inlet proton transfer reaction mass spectrometry Proton reactions Proton transfer reaction mass spectrometer Proton transfer reaction mass spectrometry Proton transfer reaction mass spectrometry PTR-MS) Proton transfer reaction mass spectrometry applications Proton transfer reaction mass spectrometry drift tube Proton transfer reaction mass spectrometry environmental Proton transfer reaction mass spectrometry food research Proton transfer reaction mass spectrometry medical Proton transfer reaction mass technique) Proton transfer reaction time-of-flight mass spectrometry Proton transfer reactions Proton, mass Proton-transfer-reaction mass environmental applications Proton-transfer-reaction mass human breath Proton-transfer-reaction mass intermediates Proton-transfer-reaction mass medical applications Protonation Reactions Real proton transfer reaction mass