English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Sulfuric acid clusters stabilized by base molecules are likely to have asignificant role in atmospheric new-particle formation. Recent advances inmass spectrometry techniques have permitted the detection of electricallycharged clusters. However, direct measurement of electrically neutralclusters is not possible. Mass spectrometry instruments can be combined witha charger, but the possible effect of charging on the composition of neutralclusters must be addressed in order to interpret and understand the measureddata. In the present work we have used formation free energies from quantumchemical methods to calculate the evaporation rates of electrically charged(both positive and negative) sulfuric acid–ammonia/dimethylamine clusters.To understand how charging will affect the composition of electricallyneutral clusters, we have compared the evaporation rates of the most stableneutral clusters with those of the corresponding charged clusters. Based onthe evaporation rates of different molecules from the charged clusters, wedetermined the most likely resulting cluster composition when a stableneutral cluster is charged and the molecules with the highest evaporationrates are lost from it. We found that all of the most stable neutralclusters will be altered by both positive and negative charging. In the caseof charging clusters negatively, base molecules will completely evaporatefrom clusters with 1 to 3 sulfuric acid molecules in the case of ammonia,and from clusters with 1 or 2 sulfuric acid molecules in the case ofdimethylamine. Larger clusters will maintain some base molecules, but theH2SO4 : base ratio will increase. In the case of positive charging,some of the acid molecules will evaporate, decreasing theH2SO4 : base ratio

Electrical charging changes the composition of sulfuric acid–ammonia/dimethylamine clusters