Raman spectra of natural clathrates in deep ice cores
Raman spectra of natural clathrates in deep ice cores
复制标题
深冰芯中天然包合物的拉曼光谱
DOI：
10.1080/13642818808208514
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
C. Langway
中科院分区：
文献类型：
--
作者：
J. Nakahara;Y. Shigesato;A. Higashi;T. Hondoh;C. Langway
摘要 在 Dye-3（格陵兰岛）收集的冰芯中 1501 m 深度处的天然包合物的拉曼光谱已在 10 至 3500 cm−1 范围内进行了测量。根据分子振动，笼形包合物中的客体分子被鉴定为 O2 和 N2。通过电介质中球形空腔的简单模型分析了振动模式的能量变化。通过计算与观察的比较，可以得出结论，客体分子仅出现在较大的包合物笼中。已在 10 至 100 cm−1 范围内测量了与温度相关的拉曼光谱。在较低温度下峰位置会移动到较低的拉曼位移。这种结构被认为是由客体分子的旋转模式的过阻尼引起的。
Abstract Raman spectra of natural clathrates at a depth of 1501 m in ice cores collected at Dye-3 (Greenland) have been measured from 10 to 3500 cm−1. The guest molecules in the clathrates were identified as O2 and N2 from their molecular vibrations. The energy shifts of the vibrational modes have been analysed by a simple model of a spherical cavity in a dielectric medium. From a comparison of calculations with observations, it is concluded that guest molecules occur only in the larger cages of the clathrates. Temperature-dependent Raman spectra have been measured from 10 to 100 cm−1. The peak position shifts to a lower Raman shift at lower temperatures. This structure is considered to arise from over-damping of the rotation modes of the guest molecules.