共查询到20条相似文献,搜索用时 93 毫秒
1.
2.
3.
散射光谱这种新谱线对应于散射分子中能级的跃迁,为研究分子结构提供了一种重要手段,引起学术界极大兴趣,拉曼也因此荣获1930年诺贝尔物理学奖。并称这种谱线为拉曼光谱。介绍了拉曼光谱的基本原理、拉曼光谱的应用以及其发展,由于拉曼光谱非常弱,实验要求比较高,最后介绍了实验仪器及利用拉曼光谱研究分子的结构。 相似文献
4.
5.
6.
天然流体包裹体中甲烷水合物生成条件原位变温拉曼光谱研究 总被引:9,自引:0,他引:9
准确获取流体包裹体中气体水合物的生成条件一直是传统包裹体分析方法面临的一个难题.文章采用原位拉曼光谱技术分析了天然流体包裹体中甲烷水合物的生成条件.并由常温拉曼光谱分析表明,研究流体包裹体的流体组成为CH4-H2O体系.通过三种方法控制实验温度的变化,在第三种方法实验条件下获得了-170 ℃时甲烷水合物与冰的拉曼光谱,逐渐升温原位观测甲烷水合物的消失温度.原位拉曼光谱检测结果表明,研究包裹体中甲烷水合物的生成温度为7.5 ℃.结合CH4-H2O体系水合物形成条件相平衡计算,得到包裹体中甲烷水合物生成时的压力为5.587 3 MPa.研究结果表明,原位拉曼光谱技术是准确获取流体包裹体种气体水合物生成条件的一种有效方法. 相似文献
7.
拉曼光谱技术具有多组分同时探测、分析周期短和非接触等特点,被应用于多个领域,但是由于较低的探测灵敏度,限制了拉曼光谱技术的发展。针对提高拉曼光谱技术对气体探测灵敏度问题,本文设计并搭建了一套基于空芯光纤气体拉曼光谱增强系统,开展了空芯光纤拉曼光谱系统和后向散射拉曼光谱实验系统对比实验研究。实验结果表明,空芯光纤对信号、背景和噪声都具有放大效果,以空气中氮气和氧气为探测物质,与后向拉曼光谱信号相比,在相同探测时间情况下,信号强度增强60倍以上,信噪比增强约6倍;在相同探测强度情况下,探测时间仅为后向散射的1/60,噪声为后向散射拉曼系统的1/2。 相似文献
8.
9.
10.
11.
The existing measurements of quarkonium polarization in proton-antiproton and proton-nucleus collisions are puzzling. We highlight issues which are often underestimated in the experimental analyses: the importance of the choice of the experimental acceptance on the comparison between experimental measurements and theoretical calculations. New measurements must provide more detailed information, such that physical conclusions can be derived without relying on model-dependent assumptions. We also describe a frame-invariant formalism which minimizes the dependence of the measurements on the experimental acceptance, facilitates the comparison with theoretical calculations, and probes systematic effects due to experimental biases. 相似文献
12.
夫兰克-赫兹实验教学的发展与完善 总被引:2,自引:1,他引:1
根据不同时期对夫兰克-赫兹实验仪的改进及对实验内容的改革扩充,阐述了该实验教学的不断发展与完善.重点介绍了对第一代夫兰克-赫兹实验的改造,增加了数据采集、电脑显示及数据处理等功能,实现集模拟与数字化为一体的实验装置. 相似文献
13.
14.
In the paper a procedure is described whereby the characterization of isotropic and anisotropic laminae is carried out by full-field measurement of the surface rotations under proper flexural loads. The analytic formulation does not necessarily imply a numerical calibration and the elastic constants are determined by integrating the whole experimental data on the surface of the specimen. Measurements were carried out by phase-stepped speckle interferometry using a shearometer based on Michelson design. The experimental instrumentation, including the loading device, and the procedures for the manipulation of experimental data are detailedly described; experimental results obtained on a steel specimen and a composite laminate are also reported. 相似文献
15.
16.
17.
18.
Zhongyi Guo Jinmei Feng Keya Zhou Yanjun Xiao Shiliang Qu Jung-Ho Lee 《Applied Physics A: Materials Science & Processing》2012,108(3):639-644
The interactions between femtosecond (fs) laser pulses and a thin Au film deposited on a silica glass substrate were systematically investigated based on experimental data. Different structures, including microholes, nanoholes, and nanobumps, are obtained when pulses with different energies are incident on the surface of a gold film. The experimental results are discussed according to specific experimental parameters. Two physical models were constructed in order to explain the experimental results. The formation of nanoholes in a silica substrate is attributed to etching by higher order harmonic generations (HHG) when the femtosecond laser pulse interacts with the generated plasma layer, while the formation of nanobumps on the surface of an Au film is attributed to the elastic and plastic characteristics of the metal film under laser pulse irradiation. 相似文献
19.
20.
M. V. Fok 《Journal of Russian Laser Research》1983,4(2):145-178
The article deals with the interpretation of the experimental results on luminescence and on the degree to which this interpretation is unambiguous and noncontradictory. More than 30 concrete cases are considered and are used as examples to demonstrate that if the experimental conditions that are seemingly of secondary importance are not sufficiently well accounted for the experimental results themselves may turn out to be ambiguous. The particular experimental conditions that can be especially “insidious” in this respect are indicated. The examples concern the kinetics of the luminescence and the investigations of its spectra and polarization. 相似文献