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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

<a href="/cs/project/GJ17-13157Y" target="_blank" >GJ17-13157Y: Metody hmotnostní spektrometrie založené na iontové chemii pro rychlé stanovení biogenních těkavých organických látek vedoucích k znečištění atmosféry</a><br>

Návaznosti

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Journal of Physical Chemistry A

ISSN

1089-5639

e-ISSN

—

Svazek periodika

122

Číslo periodika v rámci svazku

51

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

5

Strana od-do

9733-9737

Kód UT WoS článku

000454751300001

EID výsledku v databázi Scopus

2-s2.0-85059801346