Oxidation of SO2 and formation of water droplets under irradiation of 20MeV protons in N2/H2O/SO2

Shigeo Tomita; Yoichi Nakai; Shuhei Funada; Hideomi Tanikawa; Isao Harayama; Hitomi Kobara; Kimikazu Sasa; Jens Olaf Pepke Pedersen; Preben Hvelplund

doi:10.1016/j.nimb.2015.08.073

Oxidation of SO₂ and formation of water droplets under irradiation of 20MeV protons in N₂/H₂O/SO₂

Shigeo Tomita, Yoichi Nakai, Shuhei Funada, Hideomi Tanikawa, Isao Harayama, Hitomi Kobara, Kimikazu Sasa, Jens Olaf Pepke Pedersen, Preben Hvelplund

Research output: Contribution to journal › Journal article › Research › peer-review

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Abstract

We have performed an experiment on charged droplet formation in a humidified N₂ gas with trace SO₂ concentration and induced by 20MeV proton irradiation. It is thought that SO₂reacts with the chemical species, such as OH radicals, generated through the reactions triggered by N^₂+ production. Both droplet number and droplet size increased with SO₂consumption for the proton irradiation. The total charged droplet numbers entering the differential mobility analyzer per unit time were proportional to the 0.68 power of the SO₂ consumption. These two findings suggest that coagulation among the small droplets contributes to the formation of the droplets. The charged droplet volume detected per unit time is proportional to the SO₂consumption, which indicates that a constant amount of sulfur atoms is contained in a unit volume of droplet, regardless of different droplet-size distributions depending on the SO₂ consumption.

Original language	English
Journal	Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Volume	365
Pages (from-to)	616-621
ISSN	0168-583X
DOIs	https://doi.org/10.1016/j.nimb.2015.08.073
Publication status	Published - 2015

Keywords

Fast ion irradiation
Nanoparticle formation
Sulfur dioxide

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10.1016/j.nimb.2015.08.073

SHIM2015 revisedAccepted author manuscript, 426 KB

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Tomita, S., Nakai, Y., Funada, S., Tanikawa, H., Harayama, I., Kobara, H., Sasa, K., Pedersen, J. O. P., & Hvelplund, P. (2015). Oxidation of SO₂ and formation of water droplets under irradiation of 20MeV protons in N₂/H₂O/SO₂. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 365, 616-621. https://doi.org/10.1016/j.nimb.2015.08.073

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title = "Oxidation of SO2 and formation of water droplets under irradiation of 20MeV protons in N2/H2O/SO2",

abstract = "We have performed an experiment on charged droplet formation in a humidified N2 gas with trace SO2 concentration and induced by 20MeV proton irradiation. It is thought that SO2 reacts with the chemical species, such as OH radicals, generated through the reactions triggered by N2+ production. Both droplet number and droplet size increased with SO2 consumption for the proton irradiation. The total charged droplet numbers entering the differential mobility analyzer per unit time were proportional to the 0.68 power of the SO2 consumption. These two findings suggest that coagulation among the small droplets contributes to the formation of the droplets. The charged droplet volume detected per unit time is proportional to the SO2 consumption, which indicates that a constant amount of sulfur atoms is contained in a unit volume of droplet, regardless of different droplet-size distributions depending on the SO2 consumption.",

keywords = "Fast ion irradiation, Nanoparticle formation, Sulfur dioxide",

author = "Shigeo Tomita and Yoichi Nakai and Shuhei Funada and Hideomi Tanikawa and Isao Harayama and Hitomi Kobara and Kimikazu Sasa and Pedersen, {Jens Olaf Pepke} and Preben Hvelplund",

year = "2015",

doi = "10.1016/j.nimb.2015.08.073",

language = "English",

volume = "365",

pages = "616--621",

journal = "Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms",

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Tomita, S, Nakai, Y, Funada, S, Tanikawa, H, Harayama, I, Kobara, H, Sasa, K, Pedersen, JOP & Hvelplund, P 2015, 'Oxidation of SO₂ and formation of water droplets under irradiation of 20MeV protons in N₂/H₂O/SO₂', Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, vol. 365, pp. 616-621. https://doi.org/10.1016/j.nimb.2015.08.073

Oxidation of SO₂ and formation of water droplets under irradiation of 20MeV protons in N₂/H₂O/SO₂. / Tomita, Shigeo; Nakai, Yoichi; Funada, Shuhei et al.
In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 365, 2015, p. 616-621.

Research output: Contribution to journal › Journal article › Research › peer-review

TY - JOUR

T1 - Oxidation of SO2 and formation of water droplets under irradiation of 20MeV protons in N2/H2O/SO2

AU - Tomita, Shigeo

AU - Nakai, Yoichi

AU - Funada, Shuhei

AU - Tanikawa, Hideomi

AU - Harayama, Isao

AU - Kobara, Hitomi

AU - Sasa, Kimikazu

AU - Pedersen, Jens Olaf Pepke

AU - Hvelplund, Preben

PY - 2015

Y1 - 2015

N2 - We have performed an experiment on charged droplet formation in a humidified N2 gas with trace SO2 concentration and induced by 20MeV proton irradiation. It is thought that SO2 reacts with the chemical species, such as OH radicals, generated through the reactions triggered by N2+ production. Both droplet number and droplet size increased with SO2 consumption for the proton irradiation. The total charged droplet numbers entering the differential mobility analyzer per unit time were proportional to the 0.68 power of the SO2 consumption. These two findings suggest that coagulation among the small droplets contributes to the formation of the droplets. The charged droplet volume detected per unit time is proportional to the SO2 consumption, which indicates that a constant amount of sulfur atoms is contained in a unit volume of droplet, regardless of different droplet-size distributions depending on the SO2 consumption.

AB - We have performed an experiment on charged droplet formation in a humidified N2 gas with trace SO2 concentration and induced by 20MeV proton irradiation. It is thought that SO2 reacts with the chemical species, such as OH radicals, generated through the reactions triggered by N2+ production. Both droplet number and droplet size increased with SO2 consumption for the proton irradiation. The total charged droplet numbers entering the differential mobility analyzer per unit time were proportional to the 0.68 power of the SO2 consumption. These two findings suggest that coagulation among the small droplets contributes to the formation of the droplets. The charged droplet volume detected per unit time is proportional to the SO2 consumption, which indicates that a constant amount of sulfur atoms is contained in a unit volume of droplet, regardless of different droplet-size distributions depending on the SO2 consumption.

KW - Fast ion irradiation

KW - Nanoparticle formation

KW - Sulfur dioxide

U2 - 10.1016/j.nimb.2015.08.073

DO - 10.1016/j.nimb.2015.08.073

M3 - Journal article

SN - 0168-583X

VL - 365

SP - 616

EP - 621

JO - Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

JF - Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

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