Ganner Lisa, Bergmeister Stefan, Lorenz Lucas, Ončák Milan, Scheier Paul, Gruber Elisabeth
Institute for Ion Physics and Applied Physics, <a href="https://ror.org/054pv6659">University of Innsbruck</a>, Technikerstraße 25, 6020 Innsbruck, Austria.
Phys Rev Lett. 2024 Jul 12;133(2):023001. doi: 10.1103/PhysRevLett.133.023001.
Sequential ionization of fullerene cluster ions (C_{60}){n}^{+} within multiply charged helium nanodroplets leads to the intriguing phenomenon of forming and stabilizing doubly and triply charged fullerene oligomers. While the formation of doubly charged dimers (C{60}){2}^{2+} has been predicted in earlier studies, the observation of even triply charged ones (C{60}){2}^{3+} is highly surprising. This remarkable resilience against Coulomb explosion is achieved through efficient cooling within the superfluid environment of helium nanodroplets and a sequential ionization scheme that populates covalently bound or physisorbed fullerene dimers. Calculations support the stability of four differently bonded (C{60}){2}^{2+} and (C{60})_{2}^{3+} isomers and predict a low Coulomb barrier (<0.4 eV) preventing even dissociation of cold van der Waals complexes.
富勒烯簇离子（C₆₀）ₙ⁺在多电荷氦纳米液滴内的顺序电离导致了形成并稳定双电荷和三电荷富勒烯低聚物这一有趣现象。虽然早期研究中已预测到双电荷二聚体（C₆₀）₂²⁺的形成，但观察到甚至三电荷的二聚体（C₆₀）₂³⁺都非常令人惊讶。这种对库仑爆炸的显著抗性是通过氦纳米液滴超流体环境中的高效冷却以及一种填充共价键合或物理吸附富勒烯二聚体的顺序电离方案实现的。计算结果支持四种不同键合的（C₆₀）₂²⁺和（C₆₀）₂³⁺异构体的稳定性，并预测存在一个低库仑势垒（<0.4 eV），甚至能阻止冷范德华复合物的解离。
