Nanometer‐size particles such as ultrafine aerosol particles, ice nanoparticles, water nanodroplets, etc, play an important, however, not yet fully understood role in the atmospheric chemistry and physics. These species are often composed of water with admixture of other atmospherically relevant molecules. To mimic and investigate such particles in laboratory experiments, mixed water clusters with atmospherically relevant molecules can be generated in molecular beams and studied by various mass spectrometric methods. The present review demonstrates that such experiments can provide unprecedented details of reaction mechanisms, and detailed insight into the photon‐, electron‐, and ion‐induced processes relevant to the atmospheric chemistry. After a brief outline of the molecular beam preparation, cluster properties, and ionization methods, we focus on the mixed clusters with various atmospheric molecules, such as hydrated sulfuric acid and nitric acid clusters, N_xO_y and halogen‐containing molecules with water. A special attention is paid to their reactivity and solvent effects of water molecules on the observed processes.

中文翻译：

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分子束实验中气溶胶颗粒类似物的质谱分析

纳米级颗粒，例如超细气溶胶颗粒，冰纳米颗粒，水纳米滴等，在大气化学和物理学中起着重要但尚未完全了解的作用。这些物种通常由水和其他与大气相关的分子混合而成。为了在实验室实验中模拟和研究此类颗粒，可以在分子束中生成具有大气相关分子的混合水簇，并通过各种质谱方法进行研究。本综述表明，这样的实验可以提供前所未有的反应机理细节，并且可以深入了解与大气化学有关的光子，电子和离子诱导的过程。在简要概述了分子束的制备，团簇性质和电离方法之后，_x O _y和含卤素的分子与水接触。要特别注意水分子在所观察到的过程中的反应性和溶剂作用。