Uptake of methanol on mixed HNO3/H2O clusters: An absolute pickup cross section

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F18%3A00489300" target="_blank" >RIV/61388955:_____/18:00489300 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1063/1.5021471" target="_blank" >http://dx.doi.org/10.1063/1.5021471</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/1.5021471" target="_blank" >10.1063/1.5021471</a>

Result language

angličtina

Original language name

Uptake of methanol on mixed HNO3/H2O clusters: An absolute pickup cross section

Original language description

The uptake of atmospheric oxidized organics on acid clusters is relevant for atmospheric new particle formation. We investigate the pickup of methanol (CH3OH) on mixed nitric acid-water clusters (HNO3)(M)(H2O)(N) by a combination of mass spectrometry and cluster velocity measurements in a molecular beam. The mass spectra of the mixed clusters exhibit (HNO3)(m)(H2O)(n)H+ series with m = 0-3 and n = 0-12. In addition, CH3OH center dot(HNO3)(m)(H2O)(n)H+ series with very similar patterns appear in the spectra after the methanol pickup. The velocity measurements prove that the undoped (HNO3)(m)(H2O)(n)H+ mass peaks in the pickup spectra originate from the neutral (HNO3)(M)(H2O)(N) clusters which have not picked up any CH3OH molecule, i.e., methanol has not evaporated upon the ionization. Thus the fraction of the doped clusters can be determined and the mean pickup cross section can be estimated, yielding (sigma) over bar (s) approximate to 20 angstrom(2). This is compared to the lower estimate of the mean geometrical cross section (sigma) over bar (g) approximate to 60 angstrom(2) obtained from the theoretical cluster geometries. Thus the ´size´ of the cluster corresponding to the methanol pickup is at least 3-times smaller than its geometrical size. We have introduced a method which can yield the absolute pickup cross sections relevant to the generation and growth of atmospheric aerosols, as illustrated in the example of methanol and nitric acid clusters. Published by AIP Publishing.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10403 - Physical chemistry

Project

<a href="/en/project/GA17-04068S" target="_blank" >GA17-04068S: Molecular Clusters as Unique Nano-reactors: Controlling Chemistry with Photons and Electrons</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Chemical Physics

ISSN

0021-9606

e-ISSN

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Volume of the periodical

148

Issue of the periodical within the volume

15

Country of publishing house

US - UNITED STATES

Number of pages

7

Pages from-to

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UT code for WoS article

000430485700005

EID of the result in the Scopus database

2-s2.0-85045555226