DOI: 10.1002/2014JD021592
论文题名: Stabilization of sulfuric acid dimers by ammonia, methylamine, dimethylamine, and trimethylamine
作者: Jen C.N. ; McMurry P.H. ; Hanson D.R.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 21698996
出版年: 2014
卷: 119, 期: 12 起始页码: 7502
结束页码: 7514
语种: 英语
英文关键词: aerosol particles
; amines
; atmospheric nucleation
; dimer
; flow reactor
; mass spectrometry
Scopus关键词: Amination
; Amines
; Ammonia
; Atmospheric movements
; Evaporation
; Ionization of gases
; Ionization of liquids
; Mass spectrometry
; Meteorology
; Rate constants
; Sulfur determination
; Sulfuric acid
; Acid concentrations
; Aerosol particles
; Analytic expressions
; Atmospheric observations
; Cluster evaporation
; Dimer concentrations
; Flow reactors
; University of Minnesota
; Dimers
英文摘要: This study experimentally explores how ammonia (NH3), methylamine (MA), dimethylamine (DMA), and trimethylamine (TMA) affect the chemical formation mechanisms of electrically neutral clusters that contain two sulfuric acid molecules (dimers). Dimers may also contain undetectable compounds, such as water or bases, that evaporate upon ionization and sampling. Measurements were conducted using a glass flow reactor which contained a steady flow of humidified nitrogen with sulfuric acid concentrations of 107 to 109 cm-3. A known molar flow rate of a basic gas was injected into the flow reactor. The University of Minnesota Cluster Chemical Ionization Mass Spectrometer was used to measure the resulting sulfuric acid vapor and cluster concentrations. It was found that, for a given concentration of sulfuric acid vapor, the dimer concentration increases with increasing concentration of the basic gas, eventually reaching a plateau. The base concentrations at which the dimer concentrations saturate suggest NH3 < MA < TMA ≈ DMA in forming stabilized sulfuric acid dimers. Two heuristic models for cluster formation by acid-base reactions are developed to interpret the data. The models provide ranges of evaporation rate constants that are consistent with observations and leads to an analytic expression for nucleation rates that is consistent with atmospheric observations. Key Points Basic gases behave differently in forming stabilized sulfuric acid dimers NH3 < MA < TMA ≈ DMA in helping to produce stabilized sulfuric acid dimers Atmospheric nucleation modeled as acid-base reactions with cluster evaporation ©2014. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63057
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Mechanical Engineering, University of Minnesota - Twin Cities, Minneapolis, MN, United States; Department of Chemistry, Augsburg College, Minneapolis, MN, United States
Recommended Citation:
Jen C.N.,McMurry P.H.,Hanson D.R.. Stabilization of sulfuric acid dimers by ammonia, methylamine, dimethylamine, and trimethylamine[J]. Journal of Geophysical Research: Atmospheres,2014-01-01,119(12)