Stabilization of benzene radical anion in ammonia clusters

0564249 - ÚFCH JH 2023 RIV GB eng J - Článek v odborném periodiku
Pysanenko, Andriy - Bergmeister, S. - Scheier, P. - Fárník, Michal
Stabilization of benzene radical anion in ammonia clusters.
Physical Chemistry Chemical Physics. Roč. 24, č. 44 (2022), s. 27128-27135. ISSN 1463-9076. E-ISSN 1463-9084
Grant CEP: GA ČR(CZ) GA21-07062S
Institucionální podpora: RVO:61388955
Klíčová slova: photoelectron spectroscopy * solvated electrons * mass spectra
Obor OECD: Physical chemistry
Impakt faktor: 3.3, rok: 2022
Způsob publikování: Open access

We investigate electron attachment to large ammonia clusters doped with a single benzene (Bz) molecule (NH3)N·Bz, [N with combining macron] ≈ 320. Negatively charged clusters are probed by mass spectrometry, and the energy-dependent ion yields are derived from mass spectra measured at different electron energies. The ion efficiency curves of pure ammonia clusters exhibit two maxima. At around 6 eV, (NH3)n−1NH2− ions are produced via dissociative electron attachment (DEA) to NH3 molecules. (NH3)n− ions produced at this energy are formed by DEA followed by fragment caging. At low energies around 1.3 eV, only (NH3)n− ions are formed for cluster sizes n ≥ 35 that correspond to solvated electrons in ammonia clusters. The doped (NH3)n·Bz− cluster ions exhibit essentially the same energy dependence. The (NH3)n·Bz− ions are metastable and evaporate NH3 molecule(s), while pure (NH3)n− ions are stable. The lifetime for NH3 molecule evaporation from the Bz-doped clusters was estimated as τ ≈ 18 μs. We interpret the metastability of the doped clusters by the charge localization on a Bz− ion solvated in the ammonia, which is accompanied by an energy release leading to the evaporation of NH3 molecule(s).

Trvalý link: https://hdl.handle.net/11104/0335952