Increase of the Charge Transfer Rate Coefficients for NO+ and O2+• Reactions with Isoprene Molecules at Elevated Interaction Energies

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F18%3A00500247" target="_blank" >RIV/61388955:_____/18:00500247 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1021/acs.jpca.8b08580" target="_blank" >http://dx.doi.org/10.1021/acs.jpca.8b08580</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acs.jpca.8b08580" target="_blank" >10.1021/acs.jpca.8b08580</a>

Result language
angličtina
Original language name
Increase of the Charge Transfer Rate Coefficients for NO+ and O2+• Reactions with Isoprene Molecules at Elevated Interaction Energies
Original language description
Atmospheric concentrations of isoprene (2-methylbutadiene) in environmental research and in exhaled breath for medical research are usually measured by soft chemical ionization mass spectrometry that relies on a knowledge of the kinetics of the gas phase reactions of H3O+, NO+ or O2+• ions with isoprene molecules. Thus, we have carried out an experimental study of the rate coefficients, k, and product ions distributions for such reactions over a range of ion–molecule interaction energy, Er, (0.05–0.8 eV) in a helium-buffered selected ion flow-drift tube, SIFDT. It is found that contrary to the ion-induced dipole capture model, k for the NO+ and O2+• charge transfer reactions almost doubled over the Er range, while k for the H3O+ proton transfer reaction did not significantly change with Er, as predicted. These results reveal that the reaction mechanism involving ion–molecule capture forming an intermediate complex does not properly describe charge transfer to isoprene molecules. It is important to account for this increase in k with Er in these isoprene charge transfer reactions, and probably for other such reactions, when using drift tube reactors for trace gas analysis.
Czech name
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Czech description
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Type
Jimp - 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/GJ17-13157Y" target="_blank" >GJ17-13157Y: New ion chemistry methods for rapid mass spectrometric monitoring of atmospheric biogenic volatile organic compounds responsible for air pollution</a>
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

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