共查询到20条相似文献,搜索用时 671 毫秒
1.
HU Xian-quan XU Jie MA Yong ZHENG Rui-lun 《原子与分子物理学报》2006,23(Z1):59-63
The level shift and level formula of lithium atom in Rydberg states are achieved by means of the calculation of polarization of the atomic core (including the contribution of dipole moment, quadrupole moment and octupole moment);meanwhile, the effect of relativity theory, the orbital angular momentum L and the spin angular momentum S coupling (LS coupling), and high order correction of the effective potential are considered. The some fine structures (N=5~12,L=4~9,J=L±1/2) and the corresponding level intervals in Rydberg states can be calculated by the above-mentioned level formula and compared with correlated experimental data. 相似文献
2.
锂原子里德伯态能级的精细结构分裂 总被引:2,自引:2,他引:0
对锂原子的四体问题的哈密顿算符进行幂级数展开,通过计算原子实的 极化(包括偶极矩,四极矩至八级电极矩)对能级的贡献,同时考虑相对论效应和LS耦合以 及有效势的高阶修正,求得了锂原子里德伯态的能级位移和能级公式。用此公式计算N=5~1 2,L=4~9,J=L±1/2的相关的精细结构位移以及能级间隔,并与有关实验结果进行了比较 。 相似文献
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We have applied optical-optical-optical triple resonance spectroscopy to resolve a system of high Rydberg states in BH that serves quantitatively to characterize a fundamental example of electron-orbital-cation core rotational coupling. The third-color ionization-detected absorption spectrum originating from the photoselected 3s B1Sigma+ Rydberg state with vibrational and total angular momentum quantum numbers, v'=1 and N'=0 consists entirely of vibrationally autoionizing resonances for which final N=1 that converge in series to the BH+v+=1 rotational limits, N+=0, 1, and 2. For series with l=1 converging to N+=0 and 2, Rydberg orbital and rotational angular momenta couple to systematically perturb level energies and distribute lifetime in a well-isolated two-channel rotronic interaction that spans hundreds of wave numbers. 相似文献
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We investigate the quantum dynamics of ultracold Rydberg atoms being exposed to a magnetic quadrupole field. A Hamiltonian describing the coupled dynamics of the electronic and center of mass motion is derived. Employing an adiabatic approach, the potential energy surfaces for intra-n-manifold mixing are computed. By determining the quantum states of the center of mass motion, we demonstrate that trapped states can be achieved if the total angular momentum of the atom is sufficiently large. This holds even if the extension of the electronic Rydberg state becomes equal to or even exceeds that of the ultracold center of mass motion. 相似文献
8.
采用孤立实激发技术,对铕原子4f~76p_(3/2)ns(n=7,8)自电离态的光谱进行了系统的研究,同时是首次在不同激光偏振组合下进行的研究。首先,用前两束激光分步将铕原子从基态4f~76s~2经中间4f~76s6p态激发至4f~76sns里德堡态,然后再用第三束激光通过离子实4f~76s~+→4f~76p~+_(3/2)的跃迁将其进一步激发至4f~76p_(3/2)7s自电离态或4f~76p_(3/2)8s自电离态。对铕原子4f~76p_(3/2)ns(n=7,8)自电离态复杂的光谱分别给出了详细的解释,从中我们可以获得一些重要的光谱信息,比如自电峰的能级位置和线宽等,同时还可以观察到收敛于不同离子限的自电离系列之间的组态相互作用。最后,通过比较不同激光偏振组合下的自电离光谱,确定了一些自电离态的总角动量的值。 相似文献
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By a time-of-flight technique we have studied the radiative decay of lithium atoms excited to high Rydberg levels by electron impact. The observed decay rates are consistent with large values for the orbital angular momentum quantum number l. 相似文献
10.
Zhang JZ 《Physical review letters》2004,93(4):043002
The possibility of testing spatial noncommutativity via Rydberg atoms is explored. An atomic di-pole of a cold Rydberg atom is arranged in appropriate electric and magnetic fields, so that the motion of the dipole is constrained to be planar and rotationally symmetric. Spatial noncommutativity leads the canonical angular momentum to possess fractional values. In the limit of vanishing kinetic energy, the dominate value of the lowest canonical angular momentum takes variant Planck's over h/2. Furthermore, in the limit of eliminating the magnetic field, the dominate value of the lowest canonical angular momentum changes from variant Planck's over h/2 to variant Planck's over h/4. This result is a clear signal of spatial noncommutativity. An experimental verification of this prediction is suggested. 相似文献
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运用含时多态展开方法研究微波场中里德堡锂原子高激发态的性质,得到锂原子在微波场中的跃迁几率,实现对量子态的操纵与控制。结果表明:选择合适的振幅、频率等参数,可以实现布居数在量子态之间的完全跃迁。 相似文献
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We demonstrate the coherent excitation of a mesoscopic ensemble of about 100 ultracold atoms to Rydberg states by driving Rabi oscillations from the atomic ground state. We employ a dedicated beam shaping and optical pumping scheme to compensate for the small transition matrix element. We study the excitation in a weakly interacting regime and in the regime of strong interactions. When increasing the interaction strength by pair state resonances, we observe an increased excitation rate through coupling to high angular momentum states. This effect is in contrast to the proposed and previously observed interaction-induced suppression of excitation, the so-called dipole blockade. 相似文献
13.
Foltynowicz RJ Robinson JD Zückerman EJ Hedderich HG Grant ER 《Journal of Molecular Spectroscopy》2000,199(2):147-157
Analyses of high Rydberg series of HCO converging to the (030) vibrational state of the cation establish rovibrational state-detailed thresholds for HCO(+). UV-visible laser double resonance isolates series for assignment. Strongly vertical Rydberg-Rydberg transitions from photoselected N' = 0 and N' = 2 rotational levels of the Sigma(-) Renner-Teller vibronic component of the 3ppi (2)Pi (030) complex define individual series converging to rotational levels, N(+) = 1 through 5 and 3 through 5 of the HCO(+) vibrational states (03(1)0) and (03(3)0), respectively. Extrapolation of autoionizing series locates the positions of these rovibrational states to within +/-0.01 cm(-1). The use of this information combined with precise ionization limits for lower vibrational states determined from earlier Rydberg extrapolations and spectroscopic information available from infrared absorption measurements enables an estimate of the force-field parameters for HCO(+) bending. These parameters include the harmonic bending frequency, omega(2) = 842.57 cm(-1), the vibrational angular momentum splitting constant, g(22) = 3.26 cm(-1), and the diagonal bending anharmonicity, x(22) = -2.53 cm(-1), separated from the off-diagonal contribution, x(12), by reference to ab initio calculations. Results of experiment on the higher vibrationally excited states of HCO(+) are compared with recent theoretical predictions. Copyright 2000 Academic Press. 相似文献
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M. R. Flannery E. Oks 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2008,47(1):27-31
A Rydberg atom embedded in a plasma can experience penetration by slowly moving electrons within its volume. The original
pure Coulomb potential must now be replaced by a screened Coulomb potential which contains either a screening length Rs or a screening factor A = Rs
-1 . For any given discrete energy level, there is a Critical Screening Factor (CSF) Ac beyond which the energy level disappears (by merging into the continuum). Analytical results are obtained for the classical
dependence of the energy on the screening factor, for the CSF, and for the critical radius of the electron orbit for Circular
Rydberg States (CRS) in this screened Rydberg atom. The results are derived for any general form of the screened Coulomb potential
and are applied to the particular case of the Debye potential. We also show that CRS can temporarily exist above the ionization
threshold and are therefore the classical counterparts of quantal discrete states embedded into continuum. The results are
significant not only to Rydberg plasmas, but also to fusion plasmas, where Rydberg states of multi-charged hydrogen-like ions
result from charge exchange with hydrogen or deuterium atoms, as well as to dusty/complex plasmas. 相似文献
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Br2偶宇称里德堡态的转动结构和电子角动量 总被引:1,自引:1,他引:0
由(2+1)多光子电离方法获得溴分子68800-69600cm^-1范围内的[ΠΠ/2]4d偶宇称里德堡态转动激发光谱,通过对转动光谱的分析,确定了转动常数,B81-81=0.08688。并对电子角动量进行了标定,角动量Ω=1。 相似文献
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W. Li P. J. Tanner Y. Jamil T. F. Gallagher 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2006,40(1):27-35
The experiments reported here show that the
dipole-dipole interaction, the fundamental interaction between the
cold Rydberg atoms, is the dominant initial ionization mechanism for
evolution from a frozen Rydberg gas into a plasma. The study also
indicates that plasma formation follows a path of initial
ionization, redistribution of Rydberg population to higher angular
momentum states, and rapid avalanche ionization due to
electron-Rydberg collisions. 相似文献
17.
A Rydberg atom mirror has been designed and its operational principle tested experimentally. A supersonic expansion containing H atoms moving with a velocity of 720 m/s initially propagates toward a quadrupolar electrostatic mirror. The H atoms are then photoexcited to n=27 Rydberg states with a positive Stark shift and move in a rapidly increasing electric field. The H atom beam is stopped in 4.8 micros, only 1.9 mm away from the photoexcitation spot, and is then reflected back. The reflection process is monitored by pulsed field ionization and imaging. 相似文献
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利用B样条技术,设计了一种计算高激发原子能级结构的方法,计算了高激发锂原子的能级结构,并研究了里德堡锂原子在微波场中的布居动力学过程。 相似文献
19.
E. A. Yakshina D. B. Tretyakov V. M. Entin I. I. Beterov I. I. Ryabtsev 《Journal of Experimental and Theoretical Physics》2020,130(2):170-182
The dipole blockade effect at laser excitation of mesoscopic ensembles of Rydberg atoms lies in the fact that the excitation of one atom to a Rydberg state blocks the excitation of other atoms due to the shift in the collective energy levels of interacting Rydberg atoms. It is used to obtain the entangled qubit states based on single neutral atoms in optical traps. In this paper, we present our experimental results on the observation of the dipole blockade for mesoscopic ensembles of 1–5 atoms when they are detected by the selective field ionization method. We have investigated the spectra of the three-photon laser excitation 5S1/2 → 5P3/2 → 6S1/2 → nP3/2 of cold Rydberg Rb atoms in a magneto-optical trap. We have found that for mesoscopic ensembles this method allows only a partial dipole blockage to be observed. This is most likely related to the presence of parasitic electric fields reducing the interaction energy of Rydberg atoms, the decrease in the probability of detecting high states, and the strong angular dependence of the interaction energy of Rydberg atoms in a single interaction volume. 相似文献
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