共查询到18条相似文献,搜索用时 281 毫秒
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用碱金属原子的模型势结合B-样条函数展开方法研究了静电场中铷原子里德堡态的能级结构特点,计算了铷原子主量子数n由16到25之间的(n 3)s和(n,k)态间的Stark能级反交叉位置和宽度,得到了与实验相一致的结果,并给出了计算铷原子在静电场中高里德堡态能级反交叉位置的经验公式. 相似文献
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由原子的模型势出发,利用B样条函数方法研究了钾和铯原子的里德堡态在静电场中Stark态能级反交叉位置以及微波场中钾原子的多光子共振吸收谱.研究表明我们的结果与实验和其他理论结果符合得很好. 相似文献
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运用含时多态展开方法和B-样条函数研究了啁啾频率微波场中里德伯钠原子的量子态之间的布居数迁移.计算了里德伯钠原子n=70-77的开普勒频率.计算了在不同的微波场中六个态的布居数从n=70到n=77随时间的迁移,布居数跃迁到最终态n=77达到了98%,这可以通过连续的单光子跃迁来实现.结果表明,通过优化微波脉冲参数可以实现从低态到较高态的布居跃迁的相干控制. 相似文献
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钠原子高里德伯态跃迁的模型势研究 总被引:2,自引:1,他引:1
应用我们提出的k系数方法[物理学报,42(1993),727],使用最弱受约束电子势模型下的简单解析波函数,我们系统研究了钠原子高里德伯态(n~40)间跃迁的振子强度与辐射寿命,所得振子强度及辐射寿命与可得到的其他作者的结果作了比较,表明了结合k系数校正的最弱受约束电子势模型方法对于研究Na原子的高里德伯态性质的有效性,并在各种节点校正下,得到了对应于各跃迁类的节点校正规则 相似文献
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用一种势模型得出的零场状态下的波函数为基,用对角化矩阵元的方法计算了Li原子主量子数n=15-22的Li原子在电场中Stark态能级的反交叉位置及其宽度,并且和其他人用CA波函数为基作的n=15的计算进行了比较,发现符合得很好。在分析大量数据的基础上,给出了反交叉位置及其宽度和主量子数N的标度关系,这样的标度关系有助于得到更高激发态的一些信息。 相似文献
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The rotational states of adsorbed polar molecule in the presence of static electric and laser field are investigated. In this study, we have taken two types of polar molecules, namely, one with large dipole moment and moderate rotational constant (LiCl), and the other with moderate dipole moment and large rotational constant (HBr). The adsorbed molecule is considered as rigid rotor in finite conical potential well. The eigenvalues are calculated by numerically solving the Schrödinger equation. We have shown that various properties of rotational states of the molecules are significantly influenced by the static electric field, laser field, conical potential well height and the hindrance angle. Also the use of two different polar molecules for the investigation is justified by the variation in various properties due to change in molecule. 相似文献
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In this paper, we studied the effects of an electric field on a hydrogenic impurity confined in a spherical parabolic quantum dot using nondegenerate and degenerate perturbation methods. The binding energies of the ground and three low-excited states are calculated as a function of the confinement strength and as a function of the intensity of an applied electric field. Moreover, we computed the oscillator strength and the second-order nonlinear optical rectification coefficient based on the computed energies and wave functions. The results show that the electric and optical properties of hydrogenic impurity states are strongly affected by the confinement strength and the applied electric field. 相似文献
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The behaviour of the harmonic infrared frequency of diatomic molecules subjected to moderate static uniform electric fields is analysed. The potential energy expression has been developed as a function of a static uniform electric field, which brings about a formulation describing the frequency versus field strength curve. With the help of the first and second derivatives of the expressions obtained, which correspond to the first- and second-order Stark effects, it was possible to find the maxima of the frequency versus field strength curves for a series of molecules using a Newton-Raphson search. A method is proposed which requires only the calculation of a few energy derivatives at a particular value of the field strength. At the same time, the expression for the dependence of the interatomic distance on the electric field strength is derived and the minimum of this curve is found for the same species. Derived expressions and numerical results are discussed and compared with other studies. 相似文献
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以SBKJC为基组,采用密度泛函PBE0方法研究了不同外电场(0-0.030 a.u.)对(ZnSe)_(12)的基态几何结构、电荷分布、能量、电偶极矩、能隙、最小振动频率的影响;继而采用含时的TD-PBE0方法研究了(ZnSe)_(12)在外电场下的激发特性,并模拟了紫外-可见光谱.研究结果表明:外电场的加入导致分子对称性降低,当电场从0 a.u.变化到0.030 a.u.时,偶极矩逐渐增加,体系总能量、最小谐振频率和能隙一直减小.外电场对(ZnSe)_(12)的激发特性影响较大,随着电场的增加,紫外-可见光谱发生红移,同时对振子强度有很大影响,原来振子强度不为零的激发态变弱或成为禁阻跃迁,而原来振子强度很弱或禁阻的激发态变得很强.可以通过改变外电场来改变(ZnSe)_(12)的基态性质,以及控制(ZnSe)_(12)的吸收和发光特性. 相似文献
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THE POTENTIAL MODEL INVESTIGATION OF STARK EFFECT IN CAESIUM RYDBERG STATE ATOMS AND COMPARISON WITH EXPERIMENT
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The potential model method for computation of Stark structure of Cs Rydberg states atoms and oscillator strength is described, for external electric fields varying from 0 to 600V/cm. Anticrossing, l-mixing and n-mixing phenomena are observed clearly from the map of Stark. Corresponding experiment is performed under the same condition, and the two results are in good agreement with each other within the experimental uncertainty. 相似文献
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The eigenstates and eigenspectrum of a charged particle in a one-dimensional semiconductor superlattice with an impurity under the action of a dc electric field are investigated employing the single-band tight-binding model. We find that the system undergoes a series of avoided crossings, at which resonant oscillations between the impurity and its nearest neighbour occur if appropriate conditions are met, suggesting an effective two-level approximation. This phenomenon shows that introducing an impurity in a perfect lattice provides a promising structure for the observation of terahertz radiation. 相似文献
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M. H. Naderi M. Soltanolkotabi 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2006,39(3):471-479
We investigate the effect of a static electric field on
photoionization of the He atom in the ground 1S and low-lying 2S
and 2P excited states. The field-affected ionization potential and
photoionization cross-section are determined from the complex
eigenvalues of the time-dependent Schr?dinger equation solved by the
complex rotation method in the Floquet ansatz. Accuracy of the method
is enhanced by the use of the Hylleraas basis set. For the ground
state of helium, we find that the total photoionization cross-section
remains constant or decreases as a function of the DC field strength
until this field reaches a certain critical value. For the low-lying
excited states, effect of the static field is similar to the ordinary
DC Stark effect. 相似文献