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quantum defect and the Anticrossings of Diamagnetic Energy Levels of Rydberg Lithium Atom

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Progress in Natural Science:Materials International 1994年第2期 120-126页

作者：刘文瑜何兴虹李白文 Academia Sinica PRC State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan 430071 Wuhan Institute of Physics

The energy level anticrossings in n-mixing region is a significant subject in the study of atoms in external magnetic fields. In the case of an alkali atom,anticrossings are closely related to the atomic core whose overall effect is usually represented by quantum defect δ*** the study of anticrossings could turn out to be a very sensitive method to test the coupling between the Rydberg electron and the core and the variation of this coupling with the principal quantum number ***

关键词： lithium atom quantum defect even Rydberg states anticrossing oscillator strength.

Measurement of quantum defects of nS and nD states using field ionization spectroscopy in ultracold cesium atoms

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Chinese Physics B 2009年第5期18卷 1838-1842页

作者：张临杰冯志刚李安玲赵建明李昌勇贾锁堂 State Key Laboratory of quantum Optics and quantum Optics Devices College of Physics and Electronics EngineeringShanxi University

This paper reports that ultracold atoms are populated into different nS and nD Rydberg states （n=25-52） by two-photon excitation. The ionization spectrum of an ultracold Rydberg atom is acquired in a cesium magneto-optical trap by using the method of pulse field ionization. This denotes nS and nD states in the ionization spectrum and fits the data of energy levels of different Rydberg states to obtain quantum defects of nS and nD states.

关键词： ultracold Rydberg atoms quantum defect field ionization spectrum two-photon excitation

Oscillator strengths for 2 ~2S-n^2P transitions of the lithium isoelectronic sequence from Z=11 to 20

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Chinese Physics B 2009年第6期18卷 2244-2249页

作者：胡木宏王治文 School of Physics and Electronic Technology Liaoning Normal University

The dipole-length, dipole-velocity and dipole-acceleration absorption oscillator strengths for the 1s^22s-1s^2np （3 ≤ n ≤9） transitions of lithium-like systems from Z = 11 to 20 are calculated by using the energies and the multiconfiguration interaction wave functions obtained from a full core plus correlation method, in which relativistic and mass-polarization effects on the energy, as the first-order perturbation corrections, are included. The results of three forms are in good agreement with each other, and closely agree with the experimental data available in the literature. Based on the quantum defects obtained with quantum defect theory （QDT）, the discrete oscillator strengths for the transitions from the ground state to highly excited states 1s^2np （n ≥ 10） and oscillator strength densities corresponding to the bound-free transitions are obtained for these ions.

关键词： lithium isoelectronic sequence oscillator strengths quantum defect

Energy levels of 1s^2n d(n≤9)states for lithium-like ions

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Chinese Physics B 2011年第8期20卷 169-175页

作者：胡木宏王治文曾凡伟王涛王晶 School of Physics and Electronic Technology Liaoning Normal University

The full-core plus correlation method with multi-configuration interaction wave functions is extended to the calcu- lation of the non-relativistic energies of ls2nd （n ≤9） states for the lithium isoelectronic sequence from Z = 11 to 20. Relativistic and mass-polarization effects on the energy are calculated as the first-order perturbation correction. The quantum-electrodynamics correction is also included. The fine structure splittings are determined from the expectation values of spin-orbit and spin-other-orbit interaction operators in the Pauli-Breit approximation. Combining the term energies of lowly excited states obtained with the quantum defects calculated by the single channel quantum defect theory, each of which is a smooth function of energy and approximated by a weakly varying function of energy, the ion potentials of highly excited states （n ≥ 6） are obtained with the semi-empirical iteration method. The results are compared with experimental data in the literature and found to be closely consistent with the regularity.

关键词： lithium-like ions excited states quantum defect theory quantum defect

Behaviours of the excited states 1s^2 np along lithium isoelectronic sequence from Z=11 to 20

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Chinese Physics B 2008年第3期17卷 908-914页

作者：胡木宏王治文 School of Physics and Electronic Technology Liaoning Normal University

Based on the obtained energy values of 1s^2np （n≤ 9） states for lithium-like systems from Z=11 to 20 （by the authors of this paper： Hu M H and Wang Z W 2004 Chin. Phys. 13 662）, this paper determines the quantum defects, as slowly varying function of energy, of this Rydberg series. Using them as input, it can predict the energies of any highly excited states below the ionization threshold for this series a^cording to the quantum defect theory. The regularities of variation for quantum defects of the series along this isoelectronic sequence are physically analysed and discussed. The screening parameters, which are equal to the effective screening charge of the core-electrons, are also obtained.

关键词： lithium-like system excited state quantum defect screening parameter

Theoretical study on 2s2p^6np Rydberg states of Cu^(19+)ion

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Chinese Physics B 2012年第1期21卷 153-157页

作者： Zhang Zhen-Rong Cheng Xin-Lu Liu Zi-Jiang Yang Jian-Hui Li Hui-Fang Institute of Atomic and Molecular Physics Sichuan UniversityChengdu 610065China Department of Physics Lanzhou City UniversityLanzhou 730070 China

We report on the calculations of transition wavelengths and weighted oscillator strengths for 2s22p^6 2s2p^6np （4 〈 n 〈 20） electric dipole （El） transitions of Cu^19＋ ion. The flexible atomic code （FAC） has been adopted for the calculations. Comparisons are made with the experimental data available, showing that the present results for 4 〈 n 〈 6 are more accurate than the previous calculated values. Furthermore, combining the quantum defect theory （QDT） with the transition energies of 2s^22p^62s2p^6np, the quantum defects for 2s2p^6np Rydberg series of Cu^19＋ ion are determined. In addition, the energies of any highly excited states （n 〉 20） for this series can be reliably predicted using the QDT and the given quantum defects. The ionization energies for Cu^19＋ and Cu^20＋ ions are also calculated and they excellently accord with previous experimental and calculated values.

关键词： Cu^19+ion transition wavelength quantum defect quantum defect theory

Non-linear spectral splitting of Rydberg sodium in external fields

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Chinese Physics B 2015年第1期24卷 216-220页

作者：高伟杨海峰成红张珊珊刘丹峰刘红平 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences School of Optoelectronics Beijing Institute of Technology

We have studied highly excited sodium in various electric fields, parallel electric and magnetic fields, with one σ andπ photon irradiation, and even in a magnetic field with a complex laser polarization configuration. The σ spectra shows a simple linear Stark effect with the applied electric field, while the π spectra exhibits a strong non-linear dependence on the electric field. The π transitions in parallel fields show a similar behavior to that in a pure electric field but the spectra get more smooth due to the magnetic field. The diamagnetic spectrum with laser polarization angles between 0 and π /2 proves that it can be reproduced by simple linear combination of π and σ components, indicating there is no interference between the π and σ channels. A full quantum calculation considering the quantum defects accounts for all the observations. The quantum defects, especially for the channel np, play an important role in the spectral profile.

关键词： Stark spectrum magnetic spectrum quantum defect

Transition energy and dipole oscillator strength for 1s^22p-1s^2nd of Cr^(21+) ion

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Chinese Physics B 2008年第8期17卷 2909-2913页

作者：王治文刘影胡木宏李新汝王亚男 School of Physics and Electronic Technology Liaoning Normal University

The transition energies, wavelengths and dipole oscillator strengths of 1s^22p-1s^2nd （3 ≤ n ≤ 9） for Cr^21＋ ion are calculated. The fine structure splittings of 1s^2nd （n ≤ 9） states for this ion are also calculated. In calculating energy, we have estimated the higher-order relativistic contribution under a hydrogenic approximation. The quantum defect of Rydberg series 1s^2nd is determined according to the quantum defect theory. The results obtained in this paper excellently agree with the experimental data available in the literature. Combining the quantum defect theory with the discrete oscillator strengths, the discrete oscillator strengths for the transitions from initial state 1s^22p to highly excited 1s^2nd states （n ≥ 10） and the oscillator strength density corresponding to the bound-free transitions are obtained.

关键词： Cr^21+ ion transition energy fine structure splitting quantum defect

Oscillator strengths for 2 ^2P-n ^2D transitions of lithium-like systems with Z=11 to 20

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Chinese Physics B 2004年第8期13卷 1246-1250页

作者：胡木宏王治文 InstituteofAtomicandMolecularPhysics JilinUniversityChangchun130012China DepartmentofPhysics LiaoningNormalUniversityDallan116029China

The dipole-length, velocity and acceleration absorption oscillator strengths for the 1s22p-1s2nd (3 ≤ n ≤9) transitions of the lithium-like systems with Z=1 1 to 20 are calculated using the energies and the multiconfiguration interaction wavefunctions obtained from a full core plus correlation method. The agreement between the f-values calculated from the length, velocity and acceleration formulae is excellent. Our results agree closely with the experimental data avail able in the literature. Combining these discrete oscillator strengths with the single-channel quantum defect theory,the discrete oscillator strengths for the transitions from 1s22p state to highly excited states (n ≥10) and the oscillator strength densities corresponding to the bound-free transitions are obtained.

关键词： lithium-like system full-core plus correlation oscillator strength quantum defect