On the Thomson cross section of light scattering by a moving particle

The Thomson cross section of light scattering is calculated for a moving particle within classical electrodynamics.     

Deep inelastic scattering by a composite particle in the scale-invariant Quark model

A method that sums the asymptotes of Feynman diagrams is used to consider the deep inelastic scatter of leptons by a pion, treated as a bound state of a quark and antiquark. It is shown that the form of the structure functions depends only on the number and type of quarks, but is independent of the bound state which they form. An estimate is obtained for the magnitude of the quark -gluon interaction constant at small distances.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 12, pp. 59–66, December, 1976.In conclusion we would like to thank A. V. Efremov for many fruitful discussions and much assistance, and Professor D. Ivanenko for discussing the paper in his seminar.     

Antisymmetrisation effects in composite particle scattering

Several approximations for the determination of the real part of the heavy-ion optical potential have been studied. The results of these approximations for α-α scattering have been compared with the equivalent local potential determined by an inverse scattering method from a fully antisymmetrised “exact” calculation and some general conclusions are given.     

Simulation of light scattering by a particle on a film-coated substrate using coupled-dipole method

The intensity of light scattered by a submicron particle on a film-coated semiconductor substrate is calculated as a function of the thickness of the film using the coupled-dipole method. The result of calculation reproduces the experimentally observed features, i.e., the oscillatory dependence of the scattering intensity on the thickness and the enhancement of the scattering intensity for very thin films. The enhancement is reproduced only when the dipole-dipole interaction between the particle and the substrate is included in the calculation. Using the method we propose, the scattering intensity can be calculated for an arbitrary size and shape of particle on an arbitrary thickness of film.     

Dynamic light scattering of a concentrated multicomponent spherical particle solution

The“measured”dunamic structure function of highly concentrated and smallspherical colloidal system with a narrow distribution of particle sizes can be expressed in termsof the sum of two independent modes due to collective diffusion and polydispersity fluctuationsrespectively.The“measured”static structure functions S~M(K) is derived,and applied to cal-culate the polydispersity distribution.The relationship between the moments of the gammaparticle size distribution and the moments determined by a dynamic light scattering measure-ment is developed for the case when the particles are small and spherical.     

基片及其上方回转椭球粒子极化光散射

基于BV理论建立基片及其上方回转椭球粒子的复合散射模型,通过矢量球谐函数展开,对散射过程进行了分析,对散射场及微分散射截面详细求解,并给出了数值计算结果,与离散源方法做了比较,同时退化为球粒子与扩展Mie理论做了比较,说明了此方法的有效性。并详细讨论分析了微分散射截面随不同入射角,散射角,回转椭球粒子的尺寸、长短轴比例,距基片的距离,介电常数,粒子取向角的变化关系。结果表明：同一散射角下入射角越大,其微分散射截面越大;粒子尺寸越大,相互作用越大,其微分散射截面越大;长短轴比例越大,其微分散射截面越小;距离基片的距离越大,微分散射截面越大;微分散射截面的变化主要依赖于相对介电常数实部、虚部数值较大的一方,并且随粒子取向角的增大而增大。     

基片及其上方回转椭球粒子极化光散射

基于BV理论建立基片及其上方回转椭球粒子的复合散射模型,通过矢量球谐函数展开,对散射过程进行了分析,对散射场及微分散射截面详细求解,并给出了数值计算结果,与离散源方法做了比较,同时退化为球粒子与扩展Mie理论做了比较,说明了此方法的有效性。并详细讨论分析了微分散射截面随不同入射角,散射角,回转椭球粒子的尺寸、长短轴比例,距基片的距离,介电常数,粒子取向角的变化关系。结果表明:同一散射角下入射角越大,其微分散射截面越大;粒子尺寸越大,相互作用越大,其微分散射截面越大;长短轴比例越大,其微分散射截面越小;距离基片的距离越大,微分散射截面越大;微分散射截面的变化主要依赖于相对介电常数实部、虚部数值较大的一方,并且随粒子取向角的增大而增大。     

表面上方微粒及微粗糙度偏振光散射特性

为了区分由表面上方微粒和表面微粗糙度两种散射机理引起的散射光,利用偏振双向反射分布函数,并借助于由,■,■组成的正交右手基组表示了入射电场和散射电场。从理论上给出了两种不同散射机理在不同偏振状态下的双向反射分布函数与入射面外方位角之间的变化关系,并通过对这两种散射机理下的偏振双向反射分布函数的比较发现,利用p偏振入射产生的p偏振散射光(BRDFpp)可以将表面上方微粒和表面微粗糙度两种散射机理区分开来。     

Superposition rule for the magneto-optic effects in isotropic media

The two well-known magneto-optic phenomena: the Faraday and Cotton-Mouton effects describe behavior of optically isotropic medium in the external magnetic field which is parallel or perpendicular to the wave propagation direction, respectively. In this paper a superposition rule for both magneto-optic effects as a generalization of Faraday and Cotton-Mouton effects for any orientation of external magnetic field with regard to the wave propagation direction is presented.     

Raman light scattering in hydrogenated metal-carbon composite films

We have used Raman scattering, elemental analysis, and structural analysis to study the effect of the concentration of incorporated metals (Cu, Ni) on the ratio of sp²/sp³ carbon bonds in composite hydrogen-containing films a-C:H/Cu and a-C:H/Ni, formed by combining plasma-enhanced vapor phase deposition of carbon and sputtering of the metal, using a mixture of argon and methane or acetylene gases. We have shown that formation of a nanosized structure of metallic crystallites (2–5 nm) in the composite films leads to a significant increase in the fraction of disordered sp³-bonded carbon clusters and a decrease in the linear dimensions of the graphite-like carbon clusters. __________ Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 73, No. 3, pp. 344–348, May–June, 2006.     

Vertex calculation for a composite particle

The classical treatment and the quantization of composite relativistic systems is given a manifestly covariant formulation in presence of constraints. A particular formulation of Feynman's quantum mechanics is used to treat the scattering of composite relativistic systems. A covariant harmonic oscillator model is employed to calculate vertices of interactions: the results are similar to the corresponding ones in the usual field theories, but the presence of some convergence factors gives hope that a theory with composite particles may be finite.     

Application of the polar decomposition to light scattering particle systems

We have applied the polar decomposition theorem (PDT) to the scattering matrix of simple systems such as an isolated sphere, either metallic or dielectric. The discrete dipole approximation (DDA) method has been used as an intermediate tool to calculate these matrices. We show how the parameters introduced by the PDT for describing the scattering by a single sphere can be easily interpreted. It is also shown that the PDT provides us with an alternative frame to conventional Mueller matrix analysis, by characterizing the systems by means of a group of independent parameters representing magnitudes of simple (virtual) elements. This step is necessary in order to translate other complex system matrices into manageable information.     

New approaches for a light scattering Internet information portal and categorization schemes for light scattering software

Light scattering is important in a number of scientific fields and thus the efficient collation and exchange of this information becomes essential. The Internet allows information to be easily shared but the required content may be distributed over a number of web pages and thus may be difficult to locate using standard search engines.In this paper the current state of the development of a new light scattering Internet information portal is described. The upcoming technical realization for the web pages as well as the benefits for the users is outlined. One of the key features of the portal will be the comprehensive list of light scattering programs. For this also approaches to categorize light scattering software are investigated. This can help to develop search tools enabling scientists to find the best fitting program to their scattering problem.     

Nonlinear resonant light scattering by a polyatomic system

Polyatomic systems of two types are considered: a one-dimensional periodic chain of noninteracting dipoles and a plane layer of uniformly and irregularly distributed noninteracting dipoles. It is demonstrated that the Mollow triplet is observed in the spectrum of scattered radiation when the angles of strong field incidence are not very close to π/2. For sliding angles of strong field incidence on the system of dipoles, waves with frequencies of the strong field and high-frequency triplet component are scattered in forward and backward directions. In this case, radiation of low-frequency triplet component propagates along the layer on its bothsides in the form of two nonuniform waves attenuating exponentially with the distance from the layer.     

Resonant light scattering by a gradient quantum well

Resonant scattering of monochromatic light by a quantum well with the frequency of its excitonic resonance varying along a certain direction in the plane of the well is studied experimentally and theoretically. It is shown that the simplest model of a thin inhomogeneous layer that yields an exact solution of the direct and inverse scattering problems allows one to successfully describe the experimental observation of resonant scattering by a GaAs/AlGaAs quantum well with the frequency of the exciton resonance linearly varying in the plane of the well.