Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
J Phys Chem A. 2011 Aug 18;115(32):8779-82. doi: 10.1021/jp200487s. Epub 2011 Jul 22.
Argon gas at a high pressure (∼80 bar) has been expanded using a miniaturized pulsed valve at room temperature, producing a supersonic beam of cold, large argon droplets. Atoms of silver are subsequently embedded into the droplet using the pick-up technique. The resulting Ag(n)Ar(droplet) distribution was analyzed using multiphoton laser ionization time-of-flight mass spectrometry. Besides bare metal clusters, snowballs of silver monomers and dimers encapsulated in up to 50 argon atoms have been observed. The influence of the solvent on the optical absorption of the solute was studied for embedded Ag(8) using resonant two-photon ionization in the ultraviolet. A redshift and broadening of the Ag(8)Ar(droplet) optical spectrum compared to that measured in pure [Federmann et al., Eur. Phys. J. D 1999, 9, 11] and Ar-doped helium droplets [Diederich et al., J. Chem. Phys.2002, 116, 3263] was observed, which is attributed to the interaction with the larger Ar matrix environment.
在室温下，使用微型化脉冲阀将高压（约 80 巴）的氩气膨胀，产生冷的超音速大氩滴射流。随后使用拾取技术将银原子嵌入液滴中。使用多光子激光电离飞行时间质谱分析了由此产生的 Ag(n)Ar（液滴）分布。除了裸露的金属团簇外，还观察到了多达 50 个氩原子封装的银单体和二聚体的雪球。研究了溶剂对嵌入的 Ag(8)的光吸收的影响，使用紫外共振双光子电离进行了研究。与 Federmann 等人在纯[Eur. Phys. J. D 1999, 9, 11]和掺杂氩的氦液滴[Diederich 等人，J. Chem. Phys.2002, 116, 3263]中测量的 Ag(8)Ar（液滴）光学光谱相比，观察到 Ag(8)Ar（液滴）光学光谱的红移和展宽，这归因于与较大的 Ar 基质环境的相互作用。
