Characterisation of corona-generated ions used in a Neutral cluster and Air Ion Spectrometer (NAIS)

Hanna E. Manninen; A. Franchin; S. Schobesberger; A. Hirsikko; J. Hakala; A. Skromulis; J. Kangasluoma; M. Ehn; H. Junninen; A. Mirme; S. Mirme; T. Petäjä; D. R. Worsnop; Markku Kulmala

doi:10.5194/amt-4-2767-2011

Characterisation of corona-generated ions used in a Neutral cluster and Air Ion Spectrometer (NAIS)

Hanna E. Manninen (Corresponding Author), A. Franchin, S. Schobesberger, A. Hirsikko, J. Hakala, A. Skromulis, J. Kangasluoma, M. Ehn, H. Junninen, A. Mirme, S. Mirme, T. Petäjä, D. R. Worsnop, Markku Kulmala

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Abstract

We characterized size and chemical composition of ions generated by a corona-needle charger of a Neutral cluster and Air Ion Spectrometer (NAIS) by using a high resolution differential mobility analyzer and a time-of-flight mass spectrometer. Our study is crucial to verify the role of corona-generated ions in the particle size spectra measured with the NAIS, in which a corona charger is used to charge aerosol particles down to the size range overlapping with the size of generated ions. The size and concentration of ions produced by the corona discharging process depend both on corona voltage and on properties and composition of carrier gas. Negative ions were <1.6 nm (0.8 cm2 V−1 s-1 in mobility) in all tested gas mixtures (nitrogen, air with variable mixing ratios of water vapour), whereas positive ions were <1.7 nm (0.7 cm2 V-1 s−1). Electrical filtering of the corona generated ions and not removing all charged particles plays an important role in determining the lowest detection limit. Based on our experiments, the lowest detection limit for the NAIS in the particle mode is between 2 and 3 nm

Original language	English
Pages (from-to)	2767-2776
Number of pages	10
Journal	Atmospheric Measurement Techniques
Volume	4
Issue number	12
DOIs	https://doi.org/10.5194/amt-4-2767-2011
Publication status	Published - 2011
MoE publication type	A1 Journal article-refereed

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Manninen, H. E., Franchin, A., Schobesberger, S., Hirsikko, A., Hakala, J., Skromulis, A., Kangasluoma, J., Ehn, M., Junninen, H., Mirme, A., Mirme, S., Petäjä, T., Worsnop, D. R., & Kulmala, M. (2011). Characterisation of corona-generated ions used in a Neutral cluster and Air Ion Spectrometer (NAIS). Atmospheric Measurement Techniques, 4(12), 2767-2776. https://doi.org/10.5194/amt-4-2767-2011

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title = "Characterisation of corona-generated ions used in a Neutral cluster and Air Ion Spectrometer (NAIS)",

abstract = "We characterized size and chemical composition of ions generated by a corona-needle charger of a Neutral cluster and Air Ion Spectrometer (NAIS) by using a high resolution differential mobility analyzer and a time-of-flight mass spectrometer. Our study is crucial to verify the role of corona-generated ions in the particle size spectra measured with the NAIS, in which a corona charger is used to charge aerosol particles down to the size range overlapping with the size of generated ions. The size and concentration of ions produced by the corona discharging process depend both on corona voltage and on properties and composition of carrier gas. Negative ions were <1.6 nm (0.8 cm2 V−1 s-1 in mobility) in all tested gas mixtures (nitrogen, air with variable mixing ratios of water vapour), whereas positive ions were <1.7 nm (0.7 cm2 V-1 s−1). Electrical filtering of the corona generated ions and not removing all charged particles plays an important role in determining the lowest detection limit. Based on our experiments, the lowest detection limit for the NAIS in the particle mode is between 2 and 3 nm",

author = "Manninen, {Hanna E.} and A. Franchin and S. Schobesberger and A. Hirsikko and J. Hakala and A. Skromulis and J. Kangasluoma and M. Ehn and H. Junninen and A. Mirme and S. Mirme and T. Pet{\"a}j{\"a} and Worsnop, {D. R.} and Markku Kulmala",

year = "2011",

doi = "10.5194/amt-4-2767-2011",

language = "English",

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Manninen, HE, Franchin, A, Schobesberger, S, Hirsikko, A, Hakala, J, Skromulis, A, Kangasluoma, J, Ehn, M, Junninen, H, Mirme, A, Mirme, S, Petäjä, T, Worsnop, DR & Kulmala, M 2011, 'Characterisation of corona-generated ions used in a Neutral cluster and Air Ion Spectrometer (NAIS)', Atmospheric Measurement Techniques, vol. 4, no. 12, pp. 2767-2776. https://doi.org/10.5194/amt-4-2767-2011

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T1 - Characterisation of corona-generated ions used in a Neutral cluster and Air Ion Spectrometer (NAIS)

AU - Manninen, Hanna E.

AU - Franchin, A.

AU - Schobesberger, S.

AU - Hirsikko, A.

AU - Hakala, J.

AU - Skromulis, A.

AU - Kangasluoma, J.

AU - Ehn, M.

AU - Junninen, H.

AU - Mirme, A.

AU - Mirme, S.

AU - Petäjä, T.

AU - Worsnop, D. R.

AU - Kulmala, Markku

PY - 2011

Y1 - 2011

N2 - We characterized size and chemical composition of ions generated by a corona-needle charger of a Neutral cluster and Air Ion Spectrometer (NAIS) by using a high resolution differential mobility analyzer and a time-of-flight mass spectrometer. Our study is crucial to verify the role of corona-generated ions in the particle size spectra measured with the NAIS, in which a corona charger is used to charge aerosol particles down to the size range overlapping with the size of generated ions. The size and concentration of ions produced by the corona discharging process depend both on corona voltage and on properties and composition of carrier gas. Negative ions were <1.6 nm (0.8 cm2 V−1 s-1 in mobility) in all tested gas mixtures (nitrogen, air with variable mixing ratios of water vapour), whereas positive ions were <1.7 nm (0.7 cm2 V-1 s−1). Electrical filtering of the corona generated ions and not removing all charged particles plays an important role in determining the lowest detection limit. Based on our experiments, the lowest detection limit for the NAIS in the particle mode is between 2 and 3 nm

AB - We characterized size and chemical composition of ions generated by a corona-needle charger of a Neutral cluster and Air Ion Spectrometer (NAIS) by using a high resolution differential mobility analyzer and a time-of-flight mass spectrometer. Our study is crucial to verify the role of corona-generated ions in the particle size spectra measured with the NAIS, in which a corona charger is used to charge aerosol particles down to the size range overlapping with the size of generated ions. The size and concentration of ions produced by the corona discharging process depend both on corona voltage and on properties and composition of carrier gas. Negative ions were <1.6 nm (0.8 cm2 V−1 s-1 in mobility) in all tested gas mixtures (nitrogen, air with variable mixing ratios of water vapour), whereas positive ions were <1.7 nm (0.7 cm2 V-1 s−1). Electrical filtering of the corona generated ions and not removing all charged particles plays an important role in determining the lowest detection limit. Based on our experiments, the lowest detection limit for the NAIS in the particle mode is between 2 and 3 nm

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SP - 2767

EP - 2776

JO - Atmospheric Measurement Techniques

JF - Atmospheric Measurement Techniques

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ER -

Characterisation of corona-generated ions used in a Neutral cluster and Air Ion Spectrometer (NAIS)

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