Laser induced fluorescence spectroscopy of tetracene with large Ar, Ne, and H_2 clusters in superfluid He nanodroplets
Laser induced fluorescence spectroscopy of tetracene with large Ar, Ne, and H_2 clusters in superfluid He nanodroplets
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超流 He 纳米液滴中具有大 Ar、Ne 和 H_2 团簇的并四苯的激光诱导荧光光谱
DOI：
10.1021/jp203341r
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发表时间：
2011
影响因子：
--
通讯作者：
and Andrey F. Vilesov
中科院分区：
文献类型：
--
作者：
Susumu Kuma;Hiroko Nakahara;Masaaki Tsubouchi;Akira Takahashi;Majd Mustafa;Goeun Sim;Takamasa Momose;and Andrey F. Vilesov
采用激光诱导荧光技术研究了不同数量的（Ar）N、（Ne）N和（H2）N粒子（N= 1-2000）在超流He纳米液滴内组装的四烯分子簇。研究了四烯分子荧光光谱的频移与四烯分子簇大小、四烯分子簇和簇种的拾取顺序的关系。对于（Ar）Nand (Ne) n团簇，我们的结果表明，当四烯在团簇形成之前被He纳米液滴捕获时，四烯分子存在于团簇中；相反，当四烯在团簇物种之后被捕获时，四烯分子留在团簇的表面。然而，在（H2） ncluster的情况下，无论拾取顺序如何，四烯分子都位于（H2） ncluster中。我们的结论是（Ar）Nand (Ne) n团簇是刚性的（atT= 0.38 K），而（H2） n团簇在相同的温度下保持流动（toN= 2000）。结果还表明（H2） n团簇的非均相成核是由与四烯发色团分子的相互作用引起的。
Clusters of tetracene molecules with different numbers of attached (Ar)N, (Ne)Nand (H2)Nparticles (N= 1–2000) are assembled inside superfluid He nanodroplets and studied via laser-induced fluorescence. The frequency shift of the fluorescence spectrum of the tetracene molecules is studied as a function of cluster size and pickup order of tetracene and cluster species. For (Ar)Nand (Ne)Nclusters, our results indicate that the tetracene molecules reside inside the clusters when tetracene is captured by the He nanodroplet before the cluster species; conversely, the tetracene molecules stay on the surface of the clusters when tetracene is captured after the cluster species. In the case of (H2)Nclusters, however, tetracene molecules reside inside the (H2)Nclusters irrespective of the pickup order. We conclude that (Ar)Nand (Ne)Nclusters are rigid atT= 0.38 K, while (H2)Nclusters of up toN= 2000 remain fluxional at the same temperature. The results may also indicate the occurrence of heterogeneous nucleation of the (H2)Nclusters, which is induced by the interaction with tetracene chromophore molecules.