Ion and radical chemistry in (H2O2)N clusters

0525345 - ÚFCH JH 2021 RIV GB eng J - Journal Article
Pysanenko, Andriy - Pluhařová, Eva - Vinklárek, Ivo S. - Rakovský, Jozef - Poterya, Viktoriya - Kočišek, Jaroslav - Fárník, Michal
Ion and radical chemistry in (H2O2)N clusters.
Physical Chemistry Chemical Physics. Roč. 22, č. 27 (2020), s. 15312-15320. ISSN 1463-9076. E-ISSN 1463-9084
R&D Projects: GA ČR(CZ) GA19-14105S
Institutional support: RVO:61388955
Keywords : ion chemistry * clusters * hydrogen peroxide
OECD category: Physical chemistry
Impact factor: 3.676, year: 2020
Method of publishing: Limited access

We investigate the ionization induced chemistry of hydrogen peroxide in (H2O2)N clusters generated after the pickup of individual H2O2 molecules on large free ArM, M~160, nanoparticles in molecular beams. Positive and negative ion mass spectra are recorded after an electron ionization of the clusters at energies between 5 and 70 eV and after a slow electron attachment (below 4 eV), respectively. The spectra demonstrate that (H2O2)N clusters with N ≥ 20 are formed on argon nanoparticles. This is the first experimental report on hydrogen peroxide clusters in molecular beams. The major negative cluster ion series (H2O2)nO2- indicates O2- ion formation. The dissociative electron attachment to H2O2 molecule in the gas phase yielded only OH- and O- (Nandi et al., Chem. Phys. Lett., 2003, 373, 454). These ions and series containing them are much less abundant in the clusters. We propose a sequence of ion-molecule and radical reactions to explain the formation of O2-, HO2- and other ions observed in the negatively charged cluster ion series. Since, hydrogen peroxide plays an important role in many areas of chemistry from the Earth's atmosphere to biological tissues, our study opens new horizons for experimental investigations of hydrogen peroxide chemistry in complex environments.

Permanent Link: http://hdl.handle.net/11104/0309511