Electron attachment to complexes of polyaromatic hydrocarbons with O2 and CO2

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F25%3A00637340" target="_blank" >RIV/61388955:_____/25:00637340 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22340/25:43931985

Výsledek na webu

<a href="https://hdl.handle.net/11104/0368246" target="_blank" >https://hdl.handle.net/11104/0368246</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/5.0273532" target="_blank" >10.1063/5.0273532</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Electron attachment to complexes of polyaromatic hydrocarbons with O2 and CO2

Popis výsledku v původním jazyce

Clusters of polycyclic aromatic hydrocarbons (PAHs) doped with guest molecules represent a suitable model system for interstellar dust grains. Here, we investigate the electron-induced chemistry in aggregates of naphthalene, anthracene, and phenanthrene, both when they are pure and when they are doped with O2 and CO2. Clusters are experimentally produced by adiabatic expansion and doped by the molecules in a pickup process, are collided with electrons of controlled energy, and the anionic products are mass analyzed. In pure PAH clusters, a strong influence of the monomer electron affinity is observed. We see a surprising effect in doped clusters: while cluster anions with multiple CO2 molecules [i.e., (PAH) m ( CO 2 ) n - with n > 1] are detected, only anions with one O2 molecule [i.e., (PAH) m O 2 - ] are formed. In addition, the dissociation of oxygen molecules by dissociative electron attachment at 6.5 eV is quenched on PAH clusters and stable superoxide O 2 - is formed. This may influence the efficiency of the depletion of molecular oxygen in astrochemical environments with a high abundance of free electrons.

Název v anglickém jazyce

Electron attachment to complexes of polyaromatic hydrocarbons with O2 and CO2

Popis výsledku anglicky

Clusters of polycyclic aromatic hydrocarbons (PAHs) doped with guest molecules represent a suitable model system for interstellar dust grains. Here, we investigate the electron-induced chemistry in aggregates of naphthalene, anthracene, and phenanthrene, both when they are pure and when they are doped with O2 and CO2. Clusters are experimentally produced by adiabatic expansion and doped by the molecules in a pickup process, are collided with electrons of controlled energy, and the anionic products are mass analyzed. In pure PAH clusters, a strong influence of the monomer electron affinity is observed. We see a surprising effect in doped clusters: while cluster anions with multiple CO2 molecules [i.e., (PAH) m ( CO 2 ) n - with n > 1] are detected, only anions with one O2 molecule [i.e., (PAH) m O 2 - ] are formed. In addition, the dissociation of oxygen molecules by dissociative electron attachment at 6.5 eV is quenched on PAH clusters and stable superoxide O 2 - is formed. This may influence the efficiency of the depletion of molecular oxygen in astrochemical environments with a high abundance of free electrons.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Journal of Chemical Physics

ISSN

0021-9606

e-ISSN

1089-7690

Svazek periodika

163

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

024312

Kód UT WoS článku

001528008300002

EID výsledku v databázi Scopus

2-s2.0-105010463040