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Study of spectral diffusion in a broad time range by single molecule spectroscopy

单分子光谱研究宽时间范围内的光谱扩散

基本信息

批准号：
10640306
负责人：
KURITA Atusi
金额：
$ 2.11万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

The effect of hydrostatic pressure on sing-molecule spectra has been studied at〜4.2 K below the atmospheric pressure for pentacene molecules in p-terphenyl and terrylene molecules in a Shpol'skii matrix, hexadecane. All the lines examined showed linear and reversible shifts without an additional broadening. The shift parameter of the single-molecule spectrum has been found to be much spread in hexadecane compared with p-terphenyl. From the average rate of the red-shift with increasing pressure, the low-temperature compressibility of hexadecane has been estimated at 0.037 GPaィイD1-1ィエD1. The temperature dependence of the linewidth has also been found to be considerably different among individual molecules. These results are ascribed to the presence of various microscopic environments of the guest molecule in a Shpol'skii matrix. Saturation of the emission intensity and the linewidth of each single molecule were observed as function of the intensity of the excitation light. The saturation property was different for each molecule, which is ascribable to different orientation of each molecule. Some emission line showed an abrupt change of the emission intensity. Thus, is was confirmed that the spectral diffusion can be observed even under a slow scanning.

在低于大气压~ 4.2 K的条件下，研究了Shpol'skii基质十六烷中对三苯中的并戊烯分子和涤纶分子的单分子光谱。所有检查的线都显示出线性和可逆的变化，而没有额外的加宽。十六烷的单分子光谱位移参数与对三苯相比有较大的分布。根据红移随压力增加的平均速率，估计十六烷的低温可压缩性为0.037 GPa。线宽的温度依赖性也被发现在单个分子之间有很大的不同。这些结果归因于在Shpol'skii基质中客体分子的各种微观环境的存在。发射强度的饱和度和每个单分子的线宽随激发光强度的变化而变化。每个分子的饱和性质不同，这是由于每个分子的取向不同。一些发射线表现出发射强度的突变。因此，证实了即使在慢速扫描下也可以观察到光谱扩散。