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原子散射
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  atomic scattering
     Reduction of a Generalized Coulomb Integral in Atomic Scattering Theory
     原子散射理论中广义Coulomb积分的简化
短句来源
     From optical characteristics of materials based on the atomic scattering factor, the thesis introduces the reflectivity characteristic of X-ray from ideal and nonideal interface, discusses the method of selecting and confirming materials W、B4C for broadband multilayer.
     本文从基于原子散射因子的光学特性出发,讨论了X 射线在理想和非理想界面的反射特性,探讨了宽带多层膜材料W、B4C 的选定方案;
短句来源
     General formula has been derived for the complex anisotropic atomic scattering amplitudes. For 66 elemental crystals the isotropic Debye Waller factors are given and numerical procedure has been described and applied for the calculations of complex atomic scattering amplitudes and for the analytical fitting of numerical results.
     本文讨论了电子的原子散射因子和温度因子的定义与计算,给出了66种基本晶体在1K至1000K温度区间内的Debye-Waler因子,98种中性原子的电子原子弹性散射因子的解析拟合参数,可用于一般晶体吸收散射因子计算和解析拟合的计算机程序,研究了晶体热振动各向异性对于计算晶体结构因子的影响
短句来源
     Electron Atomic Scattering Amplitudes, Anisotropic Thermal Vibrations and Temperature Factors in High Energy Electron Diffraction
     高能电子的原子散射因子,晶体热振动的各向异性及温度因子
短句来源
     The cause of which was found by the comparison between theoretical and measured diffraction intensities by determining the lattice parameter of sample structures. The change of ( I/I 1) 100 depends on the atomic scattering factor of ions in Site A in the structure. The ( I/I 1) 100 decreases in (Sr,Ca)TiO 3 solid solution because the atomic scattering factor of calcium is less than that of strontium.
     通过测定晶体结构的晶胞参数 ,进而比较衍射强度理论值及实测值 ,可以证明 (I/I1) 10 0 的减弱与ABO3钙钛矿型结构中A位离子的原子散射因子有关 ,由于钙的原子散射因子小于锶的原子散射因子 ,导致 (Sr ,Ca)TiO3固溶体的相对衍射强度 (I/I1) 10 0 减弱 .
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  atom scattering
     High Resolution Study on Highly Excited Rydberg H Atom Scattering with He
     高里德堡态氢原子与氦原子散射的高分辨研究(英文)
短句来源
     Laser-assisted electron-He atom scattering Calculation of the differential cross section in a special situation
     激光辅助电子-He原子散射——一种特殊情况下的微分截面的计算
短句来源
     With the data of atom scattering factors, optical constants of some useful material for x-ray compound lens in high-energy X-ray waveband were calculated.
     利用原子散射因子数据,对常用X射线组合透镜材料在高能X射线波段的光学常数进行了计算,并分析了组合透镜设计中的材料选择问题。
短句来源
     Analysis of the Introducing of the Coulomb Dressed Potential in Atom Scattering
     库仑修饰势在原子散射中的引用分析
短句来源
     The phonon frequencies and disperse curves with surface relaxation are in good agreement with the data obtained by the helium atom scattering experiments. The polarization and localization of surface vibration are in accord with the two dimensional symmetry in the surface. The S 2 and S 3 surface modes along direction are predicted, which are in agreement with the helium atom scattering experiments.
     应用晶格动力学 ,结合分析型EAM模型 ,计算了Ag(1 1 0 )表面声子频率和振动极化方向 ,通过比较弛豫与未弛豫表面的计算结果 ,发现弛豫后的结果与He原子散射实验数据符合得很好 ,表面振动的极化局域特征符合表面的二维对称性 ,沿 Γ Y方向的S2 和S3表面模也和实验结果—致 .
短句来源
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  “原子散射”译为未确定词的双语例句
     The S,T,U parameters study of electron scattering by sodium atom
     电子与钠原子散射的S,T,U参数研究
短句来源
     A model potential method is used to study and calculate the elastic scattering for e-O,e-F and e-Ne Anglular distribution (Differential cross sections ) at the low incident energy region(0.1eV-1.0eV),the distribution angle calculated ranges from 0° to 180°.
     用模型势方法研究和计算了电子被O、F、Ne原子散射的微分截面(角分布),入射电子能量从0.1ev到1.0ev,计算的角分布从0°到180°。
短句来源
     The absolute differential cross sections of e-Ar scattering in laser field are calculated employing the second Born approximation with the static screen potential including polarization potential and the single static screen potential in the special scattering geometry that the incident electron beam is parallel to the polarization direction of laser field.
     在电子入射方向平行于激光场的极化方向这种特殊的散射模式下,应用第二玻恩近似(SBA)理论,分别利用含有极化势的静电屏蔽势和单纯的静电屏蔽势这两种原子势模型对激光场中电子-氩原子散射进行了研究,并与低频近似和实验数据进行了比较.
短句来源
     By use of the effective potential model, we have calculated the angular distributions of the elastic scattering of slow-energy electrons by He, Ne and Ar atoms in a wide range of impact energies (0.1-100ev).
     本文应用等效势模型计算了投射能量从0.1eV到100eV的电子被氦、氖和氩原子散射的角分布。
短句来源
     STUDIES FOR SPIN-POLARIZED ELECTRON-ATOM SCATTERING BY MEANS OF (e,γe) COINCIDENCE EXPERIMENT
     自旋极化电子原子散射的(e,eγ)符合实验研究
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  atomic scattering
Calculation of the atomic scattering factors of fast electrons at zero angle of incidence of an electron beam and mean inner cry
      
The main condition for propagation of weakly damped spin waves is a high anisotropy of the atomic scattering amplitude with predominance of the forward scattering.
      
These matrix elements are necessary for calculating the van der Waals coefficients C6, which are used in evaluating the atomic scattering lengths.
      
Atomic scattering factors for the first row transition metal atoms cobalt and nickel have been evaluated using non-relativistic and 'relativistic-corrected' configuration interaction wavefunctions in the |αLSMLMS? representation.
      
Relaxing the constraints imposed by the Hartree-Fock model results in a very small reduction of the atomic scattering factor at small momentum transfer with a negligible change at higher momentum transfer.
      
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  atom scattering
Theory of light and atom scattering in the Bose-Einstein condensate of a dilute gas
      
Threshold phenomena in electron-atom scattering in a laser field
      
The Schmidt number-the measure of entanglement of pure states of a continuous-variable bipartite system-is analytically calculated for a simple model of photon-atom scattering.
      
Adiabatic hyperspherical approach to describing low-energy mesic-atom scattering
      
The adiabatic hyperspherical approach developed previously is used to describe the asymmetric mesic-atom scattering aμ+b → aμ+b, a+bμ (a, b=p, d, t) in the collision-energy range 10-3≤?≤102 eV.
      
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The depth distribution of X-ray production Φ(ρz) in some alloys was computed by means of Monte Carlo method and the modified expression of the total scattering cross-section and used for quantitative electron probe microanalysis. We have carried out computation on twelve kinds of binary alloys, one ternary alloy and carbon in the silicon carbide. The results given in the present work are preferable to both ZAF method and Shimizu's method. Especially, the computed results of carbon is much better than that computed...

The depth distribution of X-ray production Φ(ρz) in some alloys was computed by means of Monte Carlo method and the modified expression of the total scattering cross-section and used for quantitative electron probe microanalysis. We have carried out computation on twelve kinds of binary alloys, one ternary alloy and carbon in the silicon carbide. The results given in the present work are preferable to both ZAF method and Shimizu's method. Especially, the computed results of carbon is much better than that computed by ZAF method. It follows that the present method can be used for quantitative microanalysis of light elements.

本文利用Monte Carlo方法和修改了的原子散射总截面公式,计算了在合金中产生X射线的深度分布φ(ρz),并用于电子探针定量分析。对12种二元合金、一种三元合金和碳化硅中的碳作了计算,结果比ZAF方法和Shimizu方法好。尤其对碳的计算结果比ZAF方法更好,表明本文的计算方法用于轻元素定量分析是可行的。

The data of electron scattering factor for all neutral atoms, given in International Tables for X-Ray Crystallography in the range of sinθ/λ from 0.0 to 2.0 have been fitted by use of the damping least square method to an analytical formula with nine parameters as

本文用阻尼最小二乘法将国际X射线结晶学手册中全部中性原子的电子散射因子数据,从sinθ/λ等于0.0到2.0的范围内,拟合成包含九个参数的解析式 f(s)=sum from i=1 to 4(a_ie~(-b)_is~2)+c.用相对偏离因子 R=sum from k=1 to N(f_(ok)+f_(ok))/sum from k=1 to Nf_(ok)作为估计原子散射因子计算值与观测值之间相对偏离程度的判据。计算结果表明,各种原子散射因子的相对偏离因子R约为 10~(-3)。文中除列出参数表外,还给出了相对偏离因子、最大误差、平均误差、均方差以及偏差方和。

Researches in the fiedld of atomic collisions are summarized and recent progress is reviewed. Now the results of atomic collsisions have been applied broadly to various aspects of chemical dynamics as well as the technologies such as gas lasers, laser isotope separation and heavy ion accelerators ets. A model of physics for the scattering of slow electron by atoms is discussed. Taking account of the polarization effect

本文回顾了原子碰撞方面的研究工作,评述了近年来这一领域中的若干进展。目前原子碰撞的研究成果已被广泛应用到化学动力学、气体激光器、激光同位素分离、重离子加速器等方面。本文讨论了慢电子被原子散射的物理模型。考虑到在入射电子作用下靶原子的极化效应,入射电子与靶原子的电子间的交换作用和入射电子波的畸变,得到了入射电子与靶原子相互作用的解析势能函数,并讨论了氦、氩、锂、钠等原子对慢电子散射的最近研究成果。

 
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