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首页> 外文期刊>The Journal of Chemical Physics >Heteronuclear molecules from matrix isolation sublimation and atomic diffusion
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Heteronuclear molecules from matrix isolation sublimation and atomic diffusion

机译：来自基质分离升华和原子扩散的异核分子

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摘要

We demonstrate the production of cryogenic beams of heteronuclear molecules from the matrix isolation sublimation (MISu) technique. A sapphire mirror serves as a substrate whereupon a solid Ne matrix is grown. Atoms of Li, H, Ca, and C are implanted into the matrix via subsequent laser ablation of different solid precursors such as Ca, Li, LiH, and graphite. The matrix is sublimated into vacuum generating a cryogenic beam of Ne carrying the previously isolated neutral atomic and molecular species. A compact and low energy electron source and time-of-flight mass spectrometer was designed to fit this system at low temperature. With electron ionization time-of-flight mass spectrometry, we analyze the species coming from MISu and demonstrate the formation of heteronuclear molecules in the matrix. In this first study, we produced LiCa from the sequential implantation of Li and Ca into the matrix and some clusters of CnLim after Li and C ablation. Also from ablation of a single LiH pellet, we observed clusters of LinHm. This novel technique opens up the opportunity to generate cryogenic beams of different molecules for precision physics and chemistry studies. Laser or microwave high resolution spectroscopy of a molecular beam benefits from low translational and rovibrational temperatures and forward velocities, such as the ones produced in this technique. Toward the prospect of enhancing the molecular formation, we introduce a new method to study the atomic diffusion of Li and Ca in the Ne matrix via laser spectroscopy during sublimation. We estimate a small diffusion coefficient at 7 K, but a surprisingly linear atomic dispersion during sublimation. The method is extensive to other species and matrices. Published by AIP Publishing.
机译：我们证明了来自基质隔离升华（Misu）技术的异核分子的低温束的生产。蓝宝石镜用作基板，在那时生长固体NE矩阵。通过随后的激光烧蚀，Li，H，Ca和C的原子通过随后的不同固体前体植入基质中，例如Ca，Li，LiH和石墨。将基质升华到真空中产生携带预先分离的中性原子和分子物种的低温束。设计紧凑且低的能量电子源和飞行时间质谱仪设计以在低温下拟合该系统。通过电子电离飞行时间质谱法，我们分析来自Misu的物种，并证明了基质中的异核分子的形成。在第一次研究中，我们从Li和Ca的连续植入中产生了LiCA和Li和C烧蚀后的CNLIM的一些簇。同样从烧蚀单个LiH颗粒，我们观察到Linhm的簇。这种新技术开辟了产生精密物理和化学研究的不同分子的低温光束的机会。激光或微波高分辨率光谱，分子束的益处从低平移和振动温度和前进速度，例如在该技术中生产的速度。朝向增强分子形成的前景，我们引入了一种新方法，以期间升华期间通过激光光谱研究Li和Ca在Ne基质中的原子扩散。我们估计在7 k下的小扩散系数，但在升华期间令人惊讶的线性原子分散。该方法对其他物种和矩阵很广泛。通过AIP发布发布。

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