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在研究塞曼调制磁旋转光谱线型的过程中,发现了入射光场的偏振特性地谱线型的影响,从而解释了实验中出现的各种线型,其中包括一些难以解释的除二次微分线型外的其它线型,并且在实验中,得到了理论分析一致的结果,为塞曼调制旋转光谱,激光光谱技术,光谱测量精度的进一步改善提供了参考依据。 相似文献
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根据光谱学,总的光谱线型是各种加宽机制的卷积结果。考虑到等离子体中的离子碰撞,Stark加宽本质上是一种非对称的光谱线型, 其中微场分布函数对光谱线型起着非常关键的作用。该文利用不同的微场分布函数研究了微场分布函数对总的光谱线型的影响。研究结果表明,在电子加宽参数和离子加宽参数很小时,不同微场分布函数对整个光谱线型的影响基本相似,但随着离子加宽参数的增加,3种不同的微场分布函数对Stark光谱线型的影响逐渐增加; 随着电子加宽参数的增加,不同的微场分布函数对Stark光谱线型的影响也逐渐增加; 但总体上Holtsmark分布和Nearest-Neighbor场分布下的光谱线型差别较小,但是Mayer模型对光谱线型影响较大。特别是,当离子加宽参数较大时,Mayer模型对光谱线型的影响异常明显,这也正说明离子间碰撞剧烈时对光谱线型的影响很大。该结果对等离子体参数诊断有一定参考价值。 相似文献
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原子光谱线增宽的原因 总被引:3,自引:0,他引:3
本文从理论上给出了原子光谱线增宽的几种原因 ,即 :①自然线宽 ,它是原子的内禀特性 (即在跃迁中所涉及到的能级的特性 ) ;②多普勒增宽 ,它是原子无规则热运动的结果 ;③碰撞增宽 ,它是原子间相互作用的结果。并对这几种原因分别给出了数量级上的估算。对原子光谱的测定具有参考意义。 相似文献
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A novel fitting method implemented recently in vibrational spectroscopy of disordered systems is briefly overviewed. It enables modelling of real line profiles intermediate between Lorentzian and Gaussian by an analytical function which has an analytical counterpart in the time domain. Numerous applications of this theoretical approach are discussed. 相似文献
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When we use a traditional adaptive line enhancer (ALE) algorithm to detect an underwater moving target, there are two disadvantages: the ability to suppress colored Gaussian noise is low and the lower the SNR is, the worse the performance of the ALE algorithm. In order to greatly overcome these disadvantages, we take full advantage of the capability of higher order cumulants to alleviate the effect of colored Gaussian noise and develop a fourth order cumulant non-diagonal slice-based adaptive dynamic line enhancer (FOCNDSBADLE) algorithm and fourth order cumulant diagonal slice-based adaptive dynamic line enhancer (FOCDSBADLE) algorithm. The adaptive filtering coefficients of these algorithms are indirectly updated by the instantaneous fourth order cumulant slices. It is shown that these slices are comprised of noiseless sinusoids if the input signals are comprised of sinusoids corrupted by Gaussian noise. Therefore these algorithms are fit to handle highly colored Gaussian noise. Simulation tests are carried out using the measured data radiated by the underwater moving target. Simulation results have shown that the FOCNDSBADLE algorithm and FOCDSBADLE algorithm outperform the ALE algorithm and that the FOCNDSBADLE algorithm outperforms the FOCDSBADLE algorithm in the case of Gaussian noise. 相似文献
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应用遗传算法结合第一性原理密度泛函理论,对中等尺寸的磷团簇体系Pn(n=21-29)做了全局搜索,研究其基态结构和电子性质。研究结果显示中等尺寸磷团簇的结构较为复杂,整体结构为管状链式结构,绝大部分没有对称性或对称性很低。团簇体系的二阶能量差分和HOMO-LUMO能隙都存在奇偶振荡,其中偶数尺寸的磷团簇要比奇数尺寸具有相对更高的稳定性。 相似文献
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Any solid state X-ray photoelectron spectrum (XPS) contains contributions due to multiple inelastic scattering in the bulk, surface excitations, energy losses originating from the screening of the final state hole (intrinsic losses), and, for non-monochromatized incident radiation, ghost lines originating from the X-ray satellites. In the present paper it is shown how all these contributions can be consecutively removed from an experimental spectrum employing a single general deconvolution procedure. Application of this method is possible whenever the contributions mentioned above are uncorrelated. It is shown that this is usually true in XPS to a good approximation. The method is illustrated on experimental non-monochromatized MgK spectra of Au acquired at different detection angles but for the same angle of incidence of the X-rays. 相似文献
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Marjan Druovec Bojan A
ko Andrej Godina Tatjana Welzer 《Optics and Lasers in Engineering》2009,47(11):1131-1138
The paper presents research into line centre detection using a video positioning system, as part of a measuring system for line scale calibration. In the described approach, the video positioning system processes an image taken by a CCD camera to estimate the position of the observed line's centre. An important part of this research is also an analysis of line scale contamination's influence (scratches, dirt, usage, etc.) on line position determination. The outcome of the research is mathematical models that can be used as a base for developing a positioning algorithm. This algorithm is simple and adaptable to different types of line scales. It also includes a module for increasing the basic scale factor of the positioning as defined by the number of pixels in the CCD sensor, and a module for reducing the influence of contamination on positioning. 相似文献
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Luca Dore 《Journal of Molecular Spectroscopy》2003,221(1):93-98
An expression for the shape of spectral lines recorded by sinusoidal frequency modulation and harmonic detection is derived. It can be fast computed by means of the Fast Fourier Transform method and it holds for any modulation depth and modulation frequency. Different line shape functions, such as Voigt, Galatry, and speed-dependent Voigt, may be included in the model. In this work, the performance of the computing method is tested with experimental second harmonic rotational profiles, but it can be applied to higher harmonic spectra as well. 相似文献
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遗传算法用于傅里叶变换红外光谱的定量解析 总被引:7,自引:3,他引:4
本文利用遗传算法对混叠的傅里叶变换红外光谱图进行了定量的解析。文中分析了最多包含了十个组分的大气有毒有机物(苯,四氯化碳,氯苯,硝基苯,苯酚,甲苯,甲醇,邻甲酚,间甲酚和对甲酚)的混合谱图,建立了适当目标函数,使用了自适应变异技术,讨论了交叉和变异概率对结果的影响。结果证明遗传算法有着极好的非线性特征。在适当的条件下,结果的相对误差小于1%。 相似文献