The C7 cluster: structure and infrared frequencies.
The C7 cluster: structure and infrared frequencies.
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C7 星团：结构和红外频率。
DOI：
10.1126/science.11538081
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发表时间：
1990
期刊：
影响因子：
56.9
通讯作者：
R. Saykally
中科院分区：
文献类型：
--
作者：
J. R. Heath;R A Sheeks;A. Cooksy;R. Saykally
本文报道了C7星系团的观测和表征。碳团簇是通过石墨靶的激光汽化，然后在气体动态聚焦氩气射流中汽化材料的超音速膨胀而产生的。本文用半导体激光吸收门控探测法探测了C7分子nu 4反对称伸缩基频的36条连续振转谱线。观察到的光谱是对称线性分子的特征。光谱分析表明，有效平均键长为1.2736（4）埃，振动频率为2138.1951（10）厘米倒数，与从头计算非常一致。这项工作将有助于对该星团进行天体物理探测。
Observation and characterization of the C7 cluster are reported. Carbon clusters are produced by laser vaporization of a graphite target followed by supersonic expansion of the vaporized material within a gas dynamically focused argon jet. Thirty-six sequential rovibrational lines of the nu 4 antisymmetric stretch fundamental of C7 are probed by gated detection of diode laser absorption. The observed spectrum is characteristic of a symmetrical linear molecule. Analysis of the spectrum indicates an effective average bond length of 1.2736(4) angstroms and a vibrational frequency of 2138.1951(10) reciprocal centimeters, in excellent agreement with ab initio calculations. This work will facilitate the astrophysical detection of this cluster.