共查询到18条相似文献,搜索用时 109 毫秒
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研究最弱受约束电子势模型的散射态,获得了精确的按“k/2π标度”归一化的散射态波函数以及相移表达式,给出了束缚—自由非相对论跃迁矩阵元的解析计算公式。这些结果可广泛应用于处理原子的散射问题之中。 相似文献
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研究最弱受约束电子势模型的散射态,获得了精确的按“k/2π标度”,归一化的散射态波函数以及相移表达式。给出了束缚-自由非相对论跃迁矩阵元的解析计算公式。这些结果可广泛应用于处理原子的散射问题之中。 相似文献
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利用了氢原子飞渡时间谱实验方法对处于高n主量子数里德堡态的氢原子与氦原子的分子束散射过程进行了高分辨研究.测量了H(n)+He→H(n′)+He散射过程的散射微分截面.实验结果表明,产物主要分布在前向散射方向,在侧向也有一定的分布.在前向和侧向存在大量的振荡结构.同时详细的研究也表明,在上述的散射过程中往前散射的方向上,氢原子里德堡态主量子数n的变化并不是很大.实验结果得到了为理论上精确研究高n主量子数里德堡态的氢原子与氦原子的散射动力学的一套精细的实验数据. 相似文献
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将无反射势阱的Schrdinger方程作自变量双曲函数变换,可使其转化为associated-Legendre方程。从而得到分别用associated-Legendre多项式和函数表示的束缚态和散射态本征函数,并讨论了散射态的归一化和这种精确本征函数的应用问题。本文给出的解较文献中已有的渐近解或特殊值的解具有一般性。 相似文献
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相对论性无自旋粒子在Hartmann势场中运动的精确解 总被引:1,自引:1,他引:0
在标量势等于矢量势的条件下,本文获得了具有Hartmann型势的Klein-Gordon方程的精确解.给出了束缚态的精确的能谱方程和归一化的径向波函数,对于散射态,获得了按“k/2π标度”归一化的径向波函数和相移的解析计算公式.讨论了散射振幅的解析性质和波函数、能谱方程以及相移的非相对论近似. 相似文献
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用Heaviside函数构造出一维对称的Hulthén势垒,求解了其满足的Klein-Gordon方程. 散射态的精确解可以由超几何函数表示, 透射系数T和反射系数R能由Klein-Gordon 方程满足的边界条件得到.并由流密度守恒推导出低动量粒子发生透射共振的条件.
关键词:
Klein-Gordon方程
Hulthén势垒
散射态
透射共振 相似文献
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将无反射势阱的Schr?dinger方程作自变量双曲函数变换,可使其转化为associated-Legendre方程。从而得到分别用associated-Legendre多项式和函数表示的束缚态和散射态本征函数,并讨论了散射态的归一化和这种精确本征函数的应用问题。本文给出的解较文献中已有的渐近解或特殊值的解具有一般性。
关键词: 相似文献
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Inelastic neutron scattering experiments to determine phonon density of states of coherent scattering samples of polycrystalline
complex solids are generally intensity-limited and therefore are feasible only at high flux facilities. Phonon density of
states of the monoclinic phase of tetracyanoethylene at 300 K, obtained using the medium resolution triple axis spectrometer
at the new Indian medium flux reactor Dhruva are reported here. The raw data is converted to the “neutron weighted” phonon
density of states by applying suitable corrections. Comparison made with results from a theoretical calculation based on a
semirigid molecule model of lattice dynamics is fair. Results from Dhruva are also consistent with that obtained (to be published)
at the high flux pulsed neutron source (ISIS) of the Rutherford Appleton Laboratory in United Kingdom. 相似文献
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Chaocheng He 《Physics letters. A》2018,382(6):440-443
We study theoretically the features of impurity-induced states on the surface of a three-dimensional Weyl semimetal in this work. For calculating the impurity-induced local density of states based on T-matrix formulation, we found that for different Weyl semimetal phases the behaviors of a local impurity exhibit distinguishable prominent features for the surface Fermi arc states. Due to two opposite-directional and -chirality surface currents for a surface, a bound state appears at the unitary limit of scattering intensity near the impurity site. Then the resonance condition for different Weyl semimetal phases and scattering intensity is investigated. Our results can be used to identify distinctive topological phases of Weyl semimetal. Furthermore, the relevance of topological nodal-point and -line systems is discussed. Some relation between our theoretical results and current experimental scheme are also discussed. 相似文献
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The scattering of electrons in image-potential states by Cu adatoms on Cu(001) surfaces has been investigated by means of time- and angle-resolved two-photon photoemission. Several interband and intraband-scattering mechanisms have been identified and their contributions to the total decay of the states determined quantitatively. The adsorbates mainly cause quasielastic scattering processes. Inelastic processes in contrast are due to interactions with electrons in the substrate and are not significantly increased by Cu adatoms. Quasielastic scattering into bulk bands contributes significantly to the depopulation of surface states. 相似文献
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In this paper, exact solutions of scattering states of the Klein-Gordon equation with Coulomb potential plus
a new ring-shaped potential are studied under the condition that
the scalar potential is equal to the vector potential. The normalized
wave functions of scattering states on the “k/2π scale” and the calculation formula of phase shifts are presented. Analytical properties of the scattering amplitude are discussed. 相似文献
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We show that both bound and scattering states of a certain class of potentials are related to the unitary representations of certain groups. In this class, several potentials of practical interest, such as the Morse and Pöschl-Teller potentials, are included. The fact that not only bound states but also scattering states are connected with group representations suggests that an algebraic treatment of scattering problems similar to that of bound state problems may be possible. 相似文献
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Gábor Zsolt Tóth 《Central European Journal of Physics》2012,10(2):349-360
The problem of extending quantum-mechanical formal scattering theory to a more general class of models that also includes
quantum field theories is discussed, with the aim of clarifying certain aspects of the definition of scattering states. As
the strong limit is not suitable for the definition of scattering states in quantum field theory, some other limiting procedure
is needed. Two possibilities are considered, the abelian limit and adiabatic switching. Formulas for the scattering states
based on both methods are discussed, and it is found that generally there are significant differences between the two approaches.
As an illustration of the applications and the features of these formulas, S-matrix elements and energy corrections in two
quantum field theoretical models are calculated using (generalized) old-fashioned perturbation theory. The two methods are
found to give equivalent results. 相似文献