Parameters governing the performance of electrical mobility spectrometers for measuring sub-3 nm particles

Show simple item record Cai, Runlong Jiang, Jingkun Mirme, Sander Kangasluoma, Juha 2020-11-14T00:56:05Z 2021-12-17T22:02:38Z 2019-01
dc.identifier.citation Cai , R , Jiang , J , Mirme , S & Kangasluoma , J 2019 , ' Parameters governing the performance of electrical mobility spectrometers for measuring sub-3 nm particles ' , Journal of Aerosol Science , vol. 127 , pp. 102-115 .
dc.identifier.other PURE: 120096418
dc.identifier.other PURE UUID: f4f68851-17c2-4e43-8142-0c8a09609426
dc.identifier.other WOS: 000450283600008
dc.identifier.other Scopus: 85056464183
dc.identifier.other ORCID: /0000-0002-1639-1187/work/51806775
dc.description.abstract Measuring aerosol size distributions accurately down to similar to 1 nm is a key to nucleation studies, and it requires developments and improvements in instruments such as electrical mobility spectrometers in use today. The key factors characterizing the performance of an electrical mobility spectrometer for sub-3 nm particles are discussed in this study. A parameter named as Pi is proposed as a figure of merit for the performance of an electrical mobility spectrometer in the sub-3 nm size range instead of the overall detection efficiency. Pi includes the overall detection efficiency, the measurement time in each size bin, the aerosol flow rate passing through the detector, and the aerosol-to-sheath flow ratio of the differential mobility analyzer. The particle raw count number recorded by the detector can be estimated using Pi at a given aerosol size distribution function, dN/dlogd(p)( ). The limit of detection for the spectrometer and the statistical uncertainty of the measured aerosol size distribution can also be readily estimated using Pi. In addition to Pi, the size resolution of an electrical mobility analyzer is another factor characterizing the systematic errors originated from particle sizing. Four existing electrical mobility spectrometers designed for measuring sub-3 nm aerosol size distributions, including three scanning/differential mobility particle spectrometers and one differential mobility analyzer train, are examined. Their optimal performance is evaluated using Pi and the size resolution. For example, the Pi value and the size resolution of a diethylene-glycol differential mobility particle spectrometer for 1.5 nm particles are 8.0 x 10(-4) cm(3) and 5.7, respectively. The corresponding relative uncertainty of the measured size distribution is approximately 9.6% during an atmospheric new particle formation event with a dN/dlogd(p) of 5 x 10(5) cm(-3) . Assuming an adjustable sheath flow rate of the differential mobility analyzer, the optimal size resolution is approximately 5-9 when measuring atmospheric new particle formation events. en
dc.format.extent 14
dc.language.iso eng
dc.relation.ispartof Journal of Aerosol Science
dc.rights cc_by_nc_nd
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject Electrical mobility spectrometer
dc.subject Sub-3 nm particles
dc.subject Penetration efficiency
dc.subject Resolution
dc.subject Uncertainty
dc.subject Aerosol size distribution
dc.subject FLOW-RATE
dc.subject NUCLEATION
dc.subject ANALYZER
dc.subject INVERSION
dc.subject MAGNIFIER
dc.subject GROWTH
dc.subject 114 Physical sciences
dc.title Parameters governing the performance of electrical mobility spectrometers for measuring sub-3 nm particles en
dc.type Article
dc.contributor.organization INAR Physics
dc.contributor.organization Institute for Atmospheric and Earth System Research (INAR)
dc.description.reviewstatus Peer reviewed
dc.relation.issn 0021-8502
dc.rights.accesslevel openAccess
dc.type.version acceptedVersion

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