PAN CIMS
PAN Chemical Ionization Mass Spectrometer

The PAN Chemical Ionization Mass Spectrometer (CIMS) is an airborne in situ spectrometer operated by NOAA. It uses the CIMS measurement technique to detect peroxynitrate (PAN) species and nitryl chloride (ClNO2). PAN CIMS has a response time of 1 second, a precision of 20 pptv, and an accuracy of 20% for both PAN and ClNO2. It is primarily deployed on aircraft but has also been used for shipborne and ground-based measurements.