QQ客服 官方微博 反馈留言

	荧光激发光谱的突变行为研究; Saltation Behavior in Excitation Spectra of Fluorescent Molecules
	苗笛 ; 徐怡庄 ; 杨军 ; 许振华 ; 吴瑾光
	2004
关键词	荧光激发光谱 吸收光谱 突变 拓扑结构 样品浓度 excitation spectra absorption spectra saltation topological structure concentration
英文摘要	在研究荧光物质的荧光光谱时, 人们利用激发光谱探讨荧光发射过程中的能量传递与荧光物质分子结构之间的关系. 一般认为, 激发光谱和吸收光谱有着对应的关系, 甚至是吸收光谱的复制. 但是, 例外却是很多. 综合考虑了在传统的测量条件下影响激发光谱的各种因素, 建立了溶液中荧光物质激发光谱的数学模型, 并结合突变论的思想对模型加以数学分析. 结果表明, 当样品浓度低于某一浓度上限时, 样品的激发光谱与吸收光谱具有相同的拓扑结构. 但是随着样品浓度的升高, 激发光谱谱带的拓扑结构会发生一系列的突变的现象. 最终导致荧光样品的激发光谱与吸收光谱之间存在很大差异. 通过对萘的正己烷溶液荧光激发光谱和吸收光谱进行比较研究, 从实验上证实了上述理论分析结果的正确性. 在传统的测量条件下, 只有当样品的浓度处于某一极限浓度以下时, 样品的激发光谱与吸收光谱之间是拓扑等价的. 超过这一浓度, 这种等价关系不再成立.; Excitation spectra are commonly used to study relationship between molecular structure of fluorescent substances and energy transfer during the fluorescence process. It is generally taken for granted that the excitation spectrum of the sample is equivalent to its absorption spectrum, even a copy of the latter. However, exceptions have been found in many cases. Considering various factors that affect the excitation spectra of solution comprehensively, a model has been established to study the behavior of the excitation spectra. After analyzing the model mathematically, including introducing catastrophe theory, we came into the following conclusions: As far as the topological properties are concerned, the excitation spectra are the same as its absorption spectra, provided the concentration of the substance is below a threshold. However, when the concentration is beyond the threshold, the excitation spectra undergo a series of topological saltation, leading to significant a deviation from the absorption spectra. Comparative studies of both excitation and absorption spectra of naphthalene dissolved in n-hexane confirmed the above hypothesis.; 国家重点基础研究发展计划(973计划); 国家自然科学基金; 教育部资助项目; 国家重点实验室基金; SCI(E); PubMed; 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 0; 5; 513-518; 24
语种	中文
出处	PubMed ; SCI ; 万方 ; http://d.g.wanfangdata.com.cn/Periodical_gpxygpfx200405001.aspx
出版者	光谱学与光谱分析
内容类型	其他
源URL	[http://hdl.handle.net/20.500.11897/77945]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	苗笛,徐怡庄,杨军,等. 荧光激发光谱的突变行为研究, Saltation Behavior in Excitation Spectra of Fluorescent Molecules. 2004-01-01.

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。