状态和大小选择中性团簇的空间分离
Spatial separation of state- and size-selected neutral clusters
摘要：
我们证明了空间分离的原型吲哚（H2O）集群中存在的各种物种的吲哚和水的混合物的超音速膨胀。产生的分子束的主要分子成分是H2O、吲哚、吲哚（H2O）和吲哚（H2O）2。先验地不清楚这种松软的系统是否适合于使用电场的强操纵。在这里，我们利用冷超声分子束和静电偏转器分离吲哚（H2O）从其他分子物种以及氦种子气。实验结果进行了定量解释的轨迹模拟，这也表明，量子状态的选择性的过程中导致样品的吲哚（H2O）在低洼的旋转状态。所制备的吲哚（H2O）的清洁样品非常适合于调查的立体动力学的这个复杂系统，包括时间分辨的半碰撞和衍射实验的固定在空间的集群。我们的研究结果清楚地表明，氢键吲哚（H2O）复合物的行为作为一个刚性分子在我们的实验条件下，它可以强烈偏转。
英文摘要：
We demonstrate the spatial separation of the prototypical indole(H2O) clusters from the various species present in the supersonic expansion of mixtures of indole and water. The major molecular constituents of the resulting molecular beam are H2O, indole, indole(H2O), and indole(H2O)2. It is a priori not clear whether such floppy systems are amenable to strong manipulation using electric fields. Here, we have exploited the cold supersonic molecular beam and the electrostatic deflector to separate indole(H2O) from the other molecular species as well as the helium seed gas. The experimental results are quantitatively explained by trajectory simulations, which also demonstrate that the quantum-state selectivity of the process leads to samples of indole(H2O) in low-lying rotational states. The prepared clean samples of indole(H2O) are ideally suited for investigations of the stereodynamics of this complex system, including time-resolved half-collision and diffraction experiments of fixed-in-space clusters. Our findings clearly demonstrate that the hydrogen bonded indole(H2O) complex behaves as a rigid molecule under our experimental conditions and that it can be strongly deflected.
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