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1)  First Born Approximation
一阶波恩近似
2)  first-order approximation
一阶近似
1.
By using the Spectrum Theorem of the general completely continuous linear operator and the Reduction method of L-S(Lyapunov-Schmdt),the first-order approximation equation of such reaction-diffusion equations is obtained.
运用一般线性全连续场谱定理和L-S(李雅普诺夫-施密特)约化方法得到了此方程的一阶近似形式并求出了从平凡解分歧出的非平凡解的具体表达式。
3)  differential cross section
二阶玻恩近似
4)  plane-wave Born approximation
平面波波恩近似
1.
Radiative transition probability,Croster-Kroning transition probability and fluorescence yield were used to transfer the ionization cross section which was calculated by plane-wave Born approximation(PWBA) theory and the ECPSSR theory to L-shell X-ray production cross section.
利用L壳层的辐射跃迁几率、Croster-Kroning跃迁几率和L亚壳层的荧光产额,将平面波波恩近似(PWBA)和ECPSSR理论计算的电离截面转换为L层X射线产生截面,并与实验结果进行比较。
5)  first order distorted wave Born approximation
一阶畸变波Born近似
1.
By discussing the mechanism of turbulence plasma scattering electromagnetic wave in hypersonic reentry wake, the first order distorted wave Born approximation model about the radar cross section is derived from the underdense turbulence plasma for engineering application.
通过探讨高超声速再入湍流尾迹等离子体场中电磁波的散射机制 ,推导出在工程上描述湍流亚密等离子体雷达散射的一阶畸变波Born近似模型 ,分析了该模型在充分发展湍流尾迹等离子体场中的适用性 ,完成了适用于三维尾迹等离子体场的程序设计 。
6)  distorted wave Born approximation
扭曲波玻恩近似
1.
The distorted wave Born approximation with polarization and post-collisional interaction has been used to calculate the triple differential cross sections for low-energy electron impact ionization of the 3s orbital of argon in coplanar asymmetric geometry.
用包含极化效应和后碰撞作用的扭曲波玻恩近似计算共面不对称几何条件下A r 3s的低能(e,2e)三重微分截面,并与实验进行比较。
2.
The triple differential cross sections for low-energy electron impact ionization of the 4s orbital of krypton have been calculated using the modified distorted wave Born approximation in coplanar symmetric energy-sharing geometry and compared with experimental results.
采用扭曲波玻恩近似,计算了共面对称条件下低能电子碰撞Kr(4s2)的(e,2e)反应三重微分截面。
补充资料:波恩奥本海默近似
分子式:
CAS号:

性质:或称定核近似。即在固定的核骨架中计算分子中电子分布的一种近似方法。该近似的基础是电子与核的质量相差极大,当核的分布发生微小变化时,电子能够迅速调整其运动状态以适应新的核势场,而核对电子在其轨道上的迅速变化却不敏感。在波恩-奥本海默近似下,分子体系的定态薛定谔方程可分解为电子运动方程和核运动方程:式中Z为核电荷数,i,j为电子编号,p,q为核编号,为拉普拉斯算符rpi。加为电子与核的距离,R为核间距,Ψe和ΨN分别为电子和核的波函数,ET为体系总能量,Ee为体系的电子能量。由于Ee在方程中是核运动的势能,所以可记为E(R),E(R)随R的变化关系图就称为势能面。在上述方程的推导中,忽略了非绝热项(即电子态之间的耦合),所以该近似也称为绝热近似。波恩-奥本海默近似在能量计算中引入的误差约为:(Me×振动能级差)/(M×电子能级差)≈10-7,一般的计算都可给出满意的结果。该近似不仅使关于分子的电子结构的讨论和计算得到简化,而且使分子势能面的概念得以成立。

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