Formation and properties of neutral ultrafine particles and small ions conditioned by gaseous impurities of the air

Bricard, J.; Cabane, Michel; Madelaine, G.; Vigla, D.

doi:10.1016/0021-9797(72)90141-5

Cited by 49 publications

(11 citation statements)

References 15 publications

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“…Now, in the latter experiment, there were no detectable condensation nuclei to verify the experimental results of Bricard et al (35), whereas irradiation in the 2200-5000 A range resulted in a large number of condensation nuclei. If one assumes that condensation nuclei are indicators of the transformation SO, + H,S04, then the value estimated for the sulfur dioxide change according to mechanism (a) is much higher than for (b).…”

Section: Results Und Coniparison Of the Mecl~unismsupporting

confidence: 62%

“…It has been noted above that, in most cases, average-sized aerosols were made of sulfur, either as sulfates or sulfuric acid, which should result from in situ oxidation by atomic oxygen of SO, of tropospheric origin. Experiments we have conducted in tropospheric conditions (35) have shown that the other mechanisms in which direct SO, photooxidation occurred hardly contributed to aerosol formation. These results have been extended to the lower stratosphere by Friend (33).…”

Section: Stratospheric Originmentioning

confidence: 98%

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Stratospheric Aerosols Physicochemistry

Bricard¹,

Vigla²

1974

Can. J. Chem.

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The stratospheric aerosol layer, a few kilometers thick and centered a few kilometers above the tropopause, is currently believed to be composed of Aitken nuclei, composed principally of ammonium sulfate, and large particles greater than 1 p ; particles larger than 5 p contain little sulfate and are believed to be of meteoritic origin.With acceptance of the direct or indirect terrestrial origin of the stratospheric ammonium sulfate particles, three processes can be suggested for their occurrence in the stratosphere: (I) coagulation of stratospheric Aitken nuclei previously formed in the troposphere; (2) oxidation of SO, of terrestrial origin in the stratosphere to H,S04 followed by nucleation and internal growth; and (3) En admettant I'origine terrestre directe ou indirecte des particules stratosphkriques du sulfate d'ammonium, trois procedes peuvent Ctre suggCrCs pour leur presence dans la stratosphere: (I) coagulation des noyaux stratospheriq~~es dlAitken prealablement forrnes dans la troposphere; (2) oxydation de SO,, d'origine terrestre, dans la stratosphere, en HrSO, suivie d e production de germes et de croissance interne; (3) reactions faisant intervenir des ions stratospheriques hydrates tels que (H,O)+ .II(H,O) qui agissent comme noyaux initiaux et facilitent la reaction de constituants gazeux, d'origine terrestre, tels que NH,, O2 et HCI.[Traduit par le journal]Can.

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Section: Results Und Coniparison Of the Mecl~unismsupporting

confidence: 62%

Section: Stratospheric Originmentioning

confidence: 98%

Stratospheric Aerosols Physicochemistry

Bricard¹,

Vigla²

1974

Can. J. Chem.

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“…The composition of cluster ions strongly depends on the age of ions and on the concentration of trace species in the air, as well as on the thermodynamical properties of the clusters and the environment (Bricard et al, 1972;Castleman et al, 1978;Eisele and Tanner, 1990;Nagato and Ogawa, 1998;Parts and Luts, 2004).…”

Section: Resultsmentioning

confidence: 99%

Initial steps of aerosol growth

et al. 2004

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Abstract. The formation and growth of atmospheric aerosols depend on several steps, namely nucleation, initial steps of growth and subsequent -mainly condensational -growth. This work focuses on the initial steps of growth, meaning the growth right after nucleation, where the interplay of curvature effects and thermodynamics has a significant role on the growth kinetics. More specifically, we investigate how ion clusters and aerosol particles grow from 1.5 nm to 20 nm (diameter) in atmospheric conditions using experimental data obtained by air ion and aerosol spectrometers. The measurements have been performed at a boreal forest site in Finland. The observed trend that the growth rate seems to increase as a function of size can be used to investigate possible growth mechanisms. Such a growth rate is consistent with a recently suggested nano-Köhler mechanism, in which growth is activated at a certain size with respect to condensation of organic vapors. The results also imply that charge-enhanced growth associated with ion-mediated nucleation plays only a minor role in the initial steps of growth, since it would imply a clear decrease of the growth rate with size. Finally, further evidence was obtained on the earlier suggestion that atmospheric nucleation and the subsequent growth of fresh nuclei are likely to be uncoupled phenomena via different participating vapors.

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“…The presence of negatively charged particles decreases the net current measured and the instrument response. Bricard et al (1972) studied the diffusing ion species using α-210 Po radioactive source. They used artificial air and pure gas (Ar) with controlled humidity (1 ∼ 10,000 ppm).…”

Section: Photoemission Chargingmentioning

confidence: 99%

Characterization of Aerosol Surface Instruments in Transition Regime

Jung

Kittelson

2005

Aerosol Science and Technology

106

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The primary purpose of this study is to measure the size-and composition-dependent responses of aerosol surface instruments designed to measure surface area related properties. The secondary purpose of this study is to investigate the difference in charging rate between singlets (NaCl particles) and agglomerates (diesel particles) by using diffusion chargers. Agglomerates (diesel particles at engine load 75%) acquire more charge than singlets (NaCl particles) by 15 and 17% for LQ1-DC and EAD, respectively.

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Formation and properties of neutral ultrafine particles and small ions conditioned by gaseous impurities of the air

Cited by 49 publications

References 15 publications

Stratospheric Aerosols Physicochemistry

Stratospheric Aerosols Physicochemistry

Initial steps of aerosol growth

Characterization of Aerosol Surface Instruments in Transition Regime

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