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首页> 外文期刊>The Journal of Chemical Physics >HIGH RESOLUTION INFRARED MOLECULAR BEAM SPECTROSCOPY OF CYANOACETYLENE CLUSTERS
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HIGH RESOLUTION INFRARED MOLECULAR BEAM SPECTROSCOPY OF CYANOACETYLENE CLUSTERS

机译：氰基苯乙烯团簇的高分辨率红外分子束光谱

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High resolution infrared optothermal spectroscopy has been used to study small clusters of cyanoacetylene, (HCCCN)(n), containing three or more monomer units. For the linear HCCCN trimer the fundamental of the free C-H stretch vibration has been rotationally resolved and analyzed, yielding a ground vibrational state rotational constant (B-0) of 94.031(13) MHz. In addition, an inner C-H stretch fundamental band of the linear trimer (rotationally unresolved) has been identified by observing the effect of large electric fields on the band shape. This assignment is also consistent with spectral intensity measurements as a function of molecular beam stagnation pressure. Predissociation lifetimes of the upper states of these two bands were determined from the observed homogeneous linewidths. Several other rotationally unresolved vibrational bands have also been observed. The stagnation pressure and electric field dependence of these spectra are used to estimate the cluster sizes and to make tentative structural assignments. (C) 1995 American Institute of Physics. [References: 42]
机译：高分辨率红外光热光谱法已用于研究包含三个或更多单体单元的氰基乙炔（HCCCN）（n）小簇。对于线性HCCCN三聚体，自由C-H拉伸振动的基础已得到旋转解析和分析，从而产生94.031（13）MHz的基振动状态旋转常数（B-0）。另外，通过观察大电场对能带形状的影响，已经确定了线性三聚体的内部C-H拉伸基带（不能旋转解析）。该分配也与作为分子束停滞压力的函数的光谱强度测量一致。从观察到的均匀线宽确定这两个谱带的上态的预离解寿命。还观察到其他几个旋转未解析的振动带。这些光谱的停滞压力和电场依赖性用于估计簇的大小并进行初步的结构分配。 （C）1995年美国物理研究所。 [参考：42]

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