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NOAA Iodide Ion Time-of-Flight Chemical Ionization Mass Spectrometer

Iodide Ion ToF (Time-of-Flight) CIMS (Chemical Ionization Mass Spectrometer)

Principle of the Measurement

Chemical ionization mass spectrometric detection of gas phase organic and inorganic analytes via I- adduct formation

Species Measured

Reactive nitrogen species: HNO3 (nitric acid), HONO (nitrous acid), HO2NO2 (peroxynitric acid), N2O5 (dinitrogen pentoxide), HNCO (isocyanic acid) 
Halogen Species: ClNO2, HCl, HBr, HOBr, HOCl, Cl2, Br2 
Low to intermediate volatility organic species

Time Response

Instrumental response <1 sec, Field response is limited by inlet surface affinity for a particular species

Detection Limit

Precision on 1s data various by species

Accuracy

(15% + 1 pptv) for N2O5
(20% + 1 pptv) for ClNO2
(30% + 15 pptv) for HONO
(25% + 10 pptv) for HO2NO2
(15% + 15 pptv) for HNO3
(20% + 5 pptv) for HNCO
(20% + 15 pptv) for HCOOH
(30% + 1 pptv) for halogenated species

Manufacturer

TOFWERK/Aerodyne Research Inc. (modified)

Instrument Type: 
Measurements: 
Aircraft: 
Instrument Team: 

The potential role of methanesulfonic acid (MSA) in aerosol formation and growth and the associated radiative forcings

Atom: Global Modeled and CAFS Measured Cloudy and Clear Sky Photolysis Rates, 2016. ORNL DAAC, Oak Ridge, Tennessee

Observationally constrained analysis of sea salt aerosol in the marine atmosphere 3

Bian, H., et al. (2019), Observationally constrained analysis of sea salt aerosol in the marine atmosphere 3, Atmos. Chem. Phys., doi:10.5194/acp-2019-18.

An evaluation of global organic aerosol schemes using airborne observations

Pai, S. J., et al. (2019), An evaluation of global organic aerosol schemes using airborne observations, Atmos. Chem. Phys., doi:10.5194/acp-2019-331.

CAFE: a new, improved non-resonant laser-induced fluorescence instrument for airborne in situ measurement of formaldehyde

Flow-induced errors in airborne in-situ measurements of aerosols and clouds

Spanu, A., et al. (2019), Flow-induced errors in airborne in-situ measurements of aerosols and clouds, Atmos. Meas. Tech., 2019, doi:10.5194/amt-2019-27.

Strong impact of wildfires on the abundance and aging of black carbon in the lowermost stratosphere

Ditas, J., et al. (2018), Strong impact of wildfires on the abundance and aging of black carbon in the lowermost stratosphere, Proc. Natl. Acad. Sci., 811595-11603, doi:10.1073/pnas.1806868115.

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