掺杂到第一溶剂化壳层的稀有气体团簇，CO2 -（Rg）n，n = 3-17，Rg = Ar，Kr，Ar
Doped rare gas clusters up to completion of first solvation shell, CO2-(Rg)n, n = 3-17, Rg = Ar, Kr, Xe
摘要：
用可调谐中红外（4.3微米）光源探测脉冲狭缝射流超声膨胀，观察到含有单个二氧化碳分子的稀有气体原子簇的光谱。有相对较少的以前详细的实验结果，这样的集群。指定的簇包括CO2-Arn，n = 3，4，6，9，10，11，12，15和17，以及CO2-Krn和-Xen，n = 3，4和5。每个光谱具有（至少）部分解析的旋转结构，并且每个光谱产生由附近稀有气体原子引起的CO2振动频率（nu 3）的偏移的精确值，以及一个或多个旋转常数。这些结果与理论预测进行了比较。更容易分配的CO2-Arn物种往往是那些具有对称结构，和CO2-Ar 17代表完成了一个高度对称的（D5 h）溶剂化壳。那些未指定的（例如n = 7，13）可能也存在于观察到的光谱中，但具有不能很好分辨的能带结构，因此无法识别。CO2-Ar 9，-Ar 15和-Ar 17的光谱表明存在涉及非常低频率（~2 cm-1）的簇振动模式的序列，这种解释应该服从理论确认（或拒绝）。
英文摘要：
Spectra of rare gas atom clusters containing a single carbon dioxide molecule are observed using a tunable mid-infrared (4.3 micron) source to probe a pulsed slit jet supersonic expansion. There are relatively few previous detailed experimental results on such clusters. The assigned clusters include CO2-Arn with n = 3, 4, 6, 9, 10, 11, 12, 15, and 17, as well as CO2-Krn and -Xen with n = 3, 4, and 5. Each spectrum has (at least) partially resolved rotational structure, and each yields precise values for the shift of the CO2 vibrational frequency (nu3) induced by the nearby rare gas atoms, together with one or more rotational constants. These results are compared with theoretical predictions. The more readily assigned CO2-Arn species tend to be those with symmetric structures, and CO2-Ar17 represents completion of a highly symmetric (D5h) solvation shell. Those not assigned (e.g. n = 7, 13) are probably also present in the observed spectra, but with band structures which are not well-resolved and thus not recognizable. The spectra of CO2-Ar9, -Ar15, and -Ar17 suggest the presence of sequences involving very low frequency (~2 cm-1) cluster vibrational modes, an interpretation which should be amenable to theoretical confirmation (or rejection).
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