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ABSTRACTA 2018 update of the most accurate calculated and experimental static dipole polarizabilities of the neutral atoms in the Periodic Table from nuclear charge Z?=?1 to 120 is given. Periodic trends are analyzed and discussed. 相似文献
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Rivail and Rinaldi's scheme to work out the quantum static multipole polarizabilities have been extended to recover convergence in it. Our expressions give exact static multipole polarizabilities for the atomic hydrogen and give reasonable values for He-sequence. 相似文献
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Tensor polarizabilities of the levels 4f146s6p3P1 in Yb and (4f66s6p+4f55d6s2)7D1,7F1,7G1 in Sm were deduced for the even isotopes from the modulation frequency of quantum beat signals. 相似文献
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S. Kümmel T. Berkus P.-G. Reinhard M. Brack 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2000,11(2):239-245
The static electric dipole polarizability of Na
N
clusters with even N has been calculated in a collective, axially averaged and a three-dimensional, finite-field approach for , including the ionic structure of the clusters. The validity of a collective model for the static response of small systems
is demonstrated. Our density functional calculations verify the trends and fine structure seen in a recent experiment. A pseudopotential
that reproduces the experimental bulk bond length and atomic energy levels leads to a substantial increase in the calculated
polarizabilities, in better agreement with experiment. We relate remaining differences in the magnitude of the theoretical
and experimental polarizabilities to the finite temperature present in the experiments.
Received 8 November 1999 相似文献
7.
Sabyasachi Kar Y.K. Ho 《Journal of Quantitative Spectroscopy & Radiative Transfer》2008,109(3):445-452
The effect of weakly coupled hot plasma environment on the oscillator strengths of the ultraviolet and visible series and the polarizabilities of helium has been investigated using variational highly correlated wave functions within the non-relativistic framework. The Debye shielding approach that admits a variety of plasma conditions is used to simulate the plasma effects. For each shielding parameter, dipole oscillator strengths are calculated for the 1 1S-n1P (n=2, 3), 2 1S-2 1P, 2 3S-n3P (n=2, 3) and 2 1,3P-n1,3D (n=3, 4) transitions. The dipole and quadrupole polarizabilities for the ground He (1s21S) state are also reported for each screening parameter. Results obtained are useful in plasma diagnostic purposes besides several other applications. 相似文献
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The B-spline configuration-interaction method is applied to the investigations of dynamic dipole polarizabilities for the four lowest triplet states(2~3S,3~3S,2~3P,and 3~3P) of the Li~+ ion.The accurate energies for the triplet states of n~3S,n~3P,and n~3D,the dipole oscillator strengths for 2~3S(3~3S)→n~3P,2~3P(3~3P)→n~3S,and 2~3P(3~3P)→n~3D transitions,with the main quantum number n up to 10 are tabulated for references.The dynamic dipole polarizabilities for the four triplet states under a wide range of photon energy are also listed,which provide input data for analyzing the Stark shift of the Li~+ ion.Furthermore,the tune-out wavelengths in the range from 100 nm to 1.2 μm for the four triplet states,and the magic wavelengths in the range from 100 nm to 600 nm for the 2~3S→3~3S,2~3S→2~3P,and 2~3S→3~3P transitions are determined accurately for the experimental design of the Li~+ ion. 相似文献
9.
Analytical expressions of non-relativistic static multipole polarizabilities for hydrogen-like ions
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Analytical formulas for the static multipole polarizabilities of hydrogen-like ions are derived by using the analytical wave functions and the reduced Green function and by applying a numerical fitting procedure.Our results are then applied to the studies of blackbody radiation shifts to atomic energy levels at different temperatures.Our analytical results can be served as a benchmark for other theoretical methods. 相似文献
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Differential oscillator strengths and dipole polarizabilities for transitions of the helium sequence
The dipole radial integral for an initial discrete 1s state and a final continuum state has been calculated under the screened hydrogenic model. In this model, single-electron hydrogenic wave functions are employed and the initial and the final states are treated by two different effective-charge parameters. Numerical values of differential oscillator strengths for transitions from 1s 21S to the continuum for the helium sequence ions are obtained. Also calculated are the dipole polarizabilities, which are found to be in excellent agreement with the results of other authors. 相似文献
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考虑初始处于EPR态的两个二能级原子A、B,将B原子注入处于真空态和单光子态的叠加态的腔中,演化一段时间后,对B原子进行选择性测量,通过选择合适的腔场初始叠加状态和演化时间,可控制原子A的偶极矩压缩效应. 相似文献
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An analogy is explored between a setup of three atomic traps coupled via tunneling and an internal atomic three-level system interacting with two laser fields. Within this scenario we describe a STIRAP like process which allows to move an atom between the ground states of two trapping potentials and analyze its robustness. This analogy is extended to other robust and coherent transport schemes and to systems of more than a single atom. Finally it is applied to manipulate external degrees of freedom of atomic wave packets propagating in waveguides. 相似文献
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E. Czuchaj 《Zeitschrift für Physik A Hadrons and Nuclei》1979,292(2):109-116
The electronic transition dipole moments in alkali-rare gas atom systems have been calculated as a function of the internuclear distanceR. The pseudopotential method of Baylis with some refinements has been used in the calculation. In particular, the Bates-Damgaard functions used in the previous pseudopotential calculations of Baylis and Pascale et al. have been replaced by the more realistic atomic orbitals suggested by Simons. The results are presented graphically for the molecular transitions associated asymptotically (R→∞) with forbiddenS-S andS-D dipole transitions in the alkali atoms. The transition moments turn out to be relatively large at internuclear distances smaller thanR=12a0. 相似文献
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The potential energy and spectroscopic constants of the ground and many excited states of the Be+He van der Waals system have been investigated using a one-electron pseudo-potential approach, which is used to replace the effect of the Be2+ core and the electron-He interactions by effective potentials. Furthermore, the core–core interactions are incorporated. This permits the reduction of the number of active electrons of the Be+He van der Waals system to only one electron. Therefore, the potential energy of the ground state as well as the excited states is performed at the SCF level and considering the spin–orbit interaction. The core–core interaction for Be2+He ground state is included using accurate CCSD (T) calculations. Then, the spectroscopic properties of the Be+He electronic states are extracted and compared with the previous theoretical and experimental studies. This comparison has shown a very good agreement for the ground and the first excited states. Moreover, the transition dipole moment has been determined for a large and dense grid of internuclear distances including the spin orbit effect. In addition, a vibrational spacing analysis for the Be2+He and Be+He ground states is performed to extract the He atomic polarisability. 相似文献
16.
Effects of polarons on static polarizabilities and second order hyperpolarizabilities of conjugated polymers
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According to the one-dimensional tight-binding Su-Schrieffer-Heeger model,we have investigated the effects of charged polarons on the static polarizability,α xx,and the second order hyperpolarizabilities,γ xxxx,of conjugated polymers.Our results are consistent qualitatively with previous ab initio and semi-empirical calculations.The origin of the universal growth is discussed using a local-view formalism that is based on the local atomic charge derivatives.Furthermore,combining the Su-Schrieffer-Heeger model and the extended Hubbard model,we have investigated systematically the effects of electron-electron interactions on α xx and γ xxxx of charged polymer chains.For a fixed value of the nearest-neighbour interaction V,the values of α xx and γ xxxx increase as the on-site Coulomb interaction U increases for U U c and decrease with U for U U c,where U c is a critical value of U at which the static polarizability or the second order hyperpolarizability reaches a maximal value of α max or γ max.It is found that the effect of the e-e interaction on the value of α xx is dependent on the ratio between U and V for either a short or a long charged polymer.Whereas,that effect on the value of γ xxxx is sensitive both to the ratio of U to V and to the size of the molecule. 相似文献
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Effects of polarons on static order hyperpolarizabilities polarizabilities and second of conjugated polymers
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According to the one-dimensional tight-binding Su-Schrieffer-Heeger model, we have investigated the effects of charged polarons on the static polarizability, axx, and the second order hyperpolarizabilities, γxxxx, of conjugated polymers. Our results are consistent qualitatively with previous ab initio and semi-empirical calculations. The origin of the universal growth is discussed using a local-view formalism that is based on the local atomic charge derivatives. Furthermore, combining the Su Schrieffer-Heeger model and the extended Hubbard model, we have investigated systematically the effects of electron-electron interactions on αxx and γxxxx of charged polymer chains. For a fixed value of the nearest-neighbour interaction V, the values of αxx and γxxxx increase as the on-site Coulomb interaction U increases for U 〈 Uc and decrease with U for U 〉 Uc, where Uc is a critical value of U at which the static polarizability or the second order hypcrpolarizability reaches a maximal value of αxx or γxxxx. It is found that the effect of the e-e interaction on the value of αxx is dependent on the ratio between U and V for either a short or a long charged polymer. Whereas, that effect on the value of γxxxx is sensitive both to the ratio of U to V and to the size of the molecule. 相似文献
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The screening of local electrostatic perturbation by indirect excitons has been investigated. It has been shown that the linear
screening is dielectric, and the effective dielectric constant may be large in the case of high degeneracy of the Bose gas
of excitons. The emergence of a condensate significantly changes the behavior of the perturbation potential at infinity, leading
to power-law asymptotic behavior with large exponents. In the nonlinear regime, the screened potential is saturated with an
unlimited increase in the initial perturbation. 相似文献
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The cesium 6(2)S(1/2) scalar dipole polarizability alpha(0) has been determined from the time-of-flight of laser cooled and launched cesium atoms traveling through an electric field. We find alpha(0)=6.611+/-0.009 x 10(-39) C m(2)/V=59.42+/-0.08 x 10(-24) cm(3)=401.0+/-0.6a(3)(0). The 0.14% uncertainty is a factor of 14 improvement over the previous measurement. Values for the 6(2)P(1/2) and 6(2)P(3/2) lifetimes and the 6(2)S(1/2) cesium-cesium dispersion coefficient C6 are determined from alpha(0) using the procedure of Derevianko and Porsev [Phys. Rev. A 65, 053403 (2002)]]. 相似文献