On the accuracy of ion measurements using a Neutral cluster and Air Ion Spectrometer

Show full item record



Permalink

http://hdl.handle.net/10138/165313

Citation

Wagner , R , Manninen , H E , Franchin , A , Lehtipalo , K , Mirme , S , Steiner , G , Petäjä , T & Kulmala , M 2016 , ' On the accuracy of ion measurements using a Neutral cluster and Air Ion Spectrometer ' , Boreal Environment Research , vol. 21 , no. 3-4 , pp. 230-241 .

Title: On the accuracy of ion measurements using a Neutral cluster and Air Ion Spectrometer
Author: Wagner, Robert; Manninen, Hanna E.; Franchin, Alessandro; Lehtipalo, Katrianne; Mirme, Sander; Steiner, Gerhard; Petäjä, Tuukka; Kulmala, Markku
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2016-05-23
Language: eng
Number of pages: 12
Belongs to series: Boreal Environment Research
ISSN: 1239-6095
URI: http://hdl.handle.net/10138/165313
Abstract: Here, we present a calibration of the Neutral cluster and Air Ion Spectrometer (NAIS, Airel Ltd.) for the size and concentration of ions in the mobility-diameter size-range 0.98-29.1 nm. Previous studies raised accuracy issues in size and concentration determination and highlighted the importance of used data inversion algorithm. Therefore, we investigated the performance of the NAIS by using five inversion methods. The presented results illustrate that the size information given by the NAIS is very accurate, regardless of the version of the data inversion. The number concentrations determined by the NAIS were 15%-30% too low especially at the lower end of the measurement size range (<5 nm), whereas concentrations at diameters 19.6 nm and larger were overestimated by up to 8%. With the correction presented in this study, the uncertainty of the ion concentration measurement of the NAIS can be reduced to less than 10%, allowing the NAIS to be used in quantitative ion cluster studies and more accurate determination of formation and growth rates.
Subject: ATMOSPHERIC AEROSOL NUCLEATION
SIZE DISTRIBUTIONS
SULFURIC-ACID
PARTICLES
MOBILITY
NAIS
NM
EVENTS
114 Physical sciences
1172 Environmental sciences
Rights:


Files in this item

Total number of downloads: Loading...

Files Size Format View
ber21_230.pdf 1.672Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record