Energy levels of perturbed 6p<Emphasis Type="Italic">n</Emphasis>d <Emphasis Type="Italic">J</Emphasis>=2 Rydberg states of Pb I by multichannel quantum defect theory

Energy levels of the odd-parity 6pnd J=2 Rydberg states of atomic lead are analyzed by the multichannel quantum defect theory (MQDT) with previous experimental energy levels. The obtained. Using these parameters, admixture coefficients for each level are calculated to designate the level denotations. The results show that strong channel mixings exist for the levels near the 6pnd (3/2)[5/2]₂ ⁰ and 6p6d (3/2)[3/2]₂ ⁰ pertubers. The five-channel model different from that in literature is used to predict 21 energy positions of 6pnd (1/2)[3/2]₂ ⁰ levels and to determine the denotations of all the 6pnd J=2 Rydberg states under 59788 cm⁻¹ for Pb I.     

Radiative lifetimes of Rydberg 6pnd J=2 states of Pb I by multichannel quantum defect theory

Energy levels of the odd-parity 6pnd J=2 Rydberg states of Pb I are analysed by the multichannel quantum defect theory (MQDT) in the frame of a five-channel three-limit calculation model. With optimal MQDT parameters, channel admixture coefficients are obtained and used to calculate the theoretical lifetimes of the levels by comparing to the previously measured lifetimes. The predicted lifetimes for higher-lying Rydberg states are given and discussed. These predicted lifetimes are very different from those obtained by the four-channel two-limit model pl:eviously used, which means that introduction of the additional interacting channel is important for studying the 6pnd J=2 Rydberg states of Pb I.     

铅原子J=2奇宇称能谱的MQDT分析

在多通道量子数亏损理论(MQDT)的基础上,对铅原子J=2奇宇称的MQDT模型进行了分析,并利用MQDT波函数给出了计算高激发态寿命的一般方法,计算并预言了     

Energy levels and radiative lifetimes of 3pns 3P0 and 3pnd 3P0 series of Si I

The energy levels and lifetimes of 3pns ^3po （n = 7 - 35） and 3pnd ^3p0 （n = 6 - 17） series of neutral silicon are calculated and predicted by means of multichannel quantum defect theory （MQDT）. In addition, the perturbation caused by core-excited state 3s3p^3 is discussed. The 3pnd ^3p0 series, especially 3p4d ^3p0, 3p5d ^3P0, and 3p6d ^3P0 are perturbed strongly by the core-excited state 3s3p3 ^3P0. These cause the lifetime of 3pnd ^3P0 （n = 5 - 7） to be less than that of 3p4d 3Po. The lifetimes of 3p14d ^3P0 （65479.14 cm^-1） and 3p16d ^3p0 （65608.77 cm^-1） are less than that of their frontal states respectively, because these states are perturbed by 3p22s ^3p0 （65476.48 cm-1） and 3p30s ^3p0 （65608.99 cm^-1） respectively.     

GaII能谱的多通道量子数亏损理论(MQDT)分析

本文利用多通道量子数亏损理论(MQDT),通过拟合Isberg等人新近关于Gall的实验能级数据,确定出偶宇称J=0,1,2,3和奇宇称J=1,2六个对称块的MQDT参数,预言了11个Rydberg系列离散能级的位置,并分析了各Rydbyrg系列之间的干扰情况,除个别低能级外,能级计算值与已测得的实验值符合得很好。 关键词：     

锡原子奇宇称5pnd和5pns J = 1, 2 Rydberg系列的多通道量子亏损理论研究

利用多通道量子亏损理论（MQDT）,对锡原子奇宇称5pnd和5pns组态的J = 1,2简并受扰Rydberg系列能级进行了理论分析研究. 通过拟合实验能级,得到了MQDT优化参数,所得理论能级值与文献报道的实验结果符合得很好. 由算得的通道混合系数,分析讨论了通道相互作用特性,确定了所有能级的原子态命名. 本文结果有助于人们更好地了解锡原子高激发态的能级结构和组态相互作用特性.     

铅原子奇宇称Rydberg系列寿命的研究

在多通道量子数亏损理论(MQDT)的基础上,利用已给出的用MQDT波函数统一计算高激发态寿命的方法,计算并预言了J=1奇宇称两个Rydberg系列的寿命,在利用MQDT计算时,确定了6p6d3/2[3/2]₁⁰的能级位置.     

KⅡ离子3p光吸收谱的MQDT分析

利用多通道量子数亏损理论对钾的一价离子的3p光吸收光谱进行了分析,计算并预言了80多个实验上未观察到的能级以及相应能级的朗德g因子,对于实验上未区分的能级做了重新的认定,预言了自电离区的3p5ns(1/2,1/2)n=17-21的能级,讨论了通道之间的干扰情况。     

氖原子奇宇称里德堡能级的理论计算

本文依据最弱受约束电子势模型理论,计算了氖原子1s22s22p5(2Po3/2)ns 2[3/2]o1,2(n=3～50) 和 1s22s22p5(2Po3/2)nd 2[1/2]o0,1(n=3～50)里德堡系列能级和量子亏损.计算结果与已有的51个实验数据符合得很好,并预言了141个能级的位置.     

氖原子奇宇称里德堡能级的理论计算

本文依据最弱受约束电子势模型理论,计算了氖原子1s22s22p5(2Po3/2)ns 2[3/2]o1,2(n=3-50) 和 1s22s22p5(2Po3/2)nd 2[1/2]o0,1(n=3-50)里德堡系列能级和量子亏损。计算结果与已有的51个实验数据符合得很好,并预言了141个能级的位置。     

Relativistic Multichannel Treatment of Ionic Rydberg States of Lanthanum

Ionic Rydberg energy levels of lanthanum are calculated from first principles by relativistic multichannel theory within the framework of multichannel quantum defect theory. The present calculated results are in better agreement with the experimental measurements than the previous calculations [J. Phys. B 34 （2001）369] due to the consideration of dynamical polarizations. Moreover, in the experimental spectra achieved by a five-laser resonance excitation via the intermediate state 5d6d^3 F2, a series of weak ionic Rydberg states and some of perturbing states are found and assigned in this work.     

Three-step laser excitation of the 6p3/2ns,nd, ng autoionizing Rydberg levels via the 6p5f 1/2[5/2]2 level of lead

Odd parity autoionizing Rydberg levels of atomic lead in the energy region above the 6p1/2 ionization threshold have been investigated using three-step laser excitation in conjunction with an atomic beam apparatus. The 6p3/2ns (J = 1, 2), 6p3/2nd (J = 1, 2, 3) and 6p3/2ng (J = 2, 3) levels have been observed from the 6p5f 1/2[5/2]2 intermediate level. Energy values and FWHM of forty levels belonging to the 6p3/2ns, 6p3/2nd and 6p3/2ng configurations are presented. Six levels based on the 6p3/2ng (5, 13 n 15) configurations and three levels attached to the 6p3/28d configuration are reported for the first time. The present study of the low-lying autoionizing levels attached to the 6p3/25g (J = 2, 3) configuration completes the series adjacent to the 6p1/2 limit.     

碳原子里德堡能级的计算

依据最弱受约束电子势模型及其微扰修正理论,计算了碳原子1s22s22pns 3P02,1,0 (n=3-50) 和1s22s22pnd 3F03,2 (n=3-50)里德堡系列能级和量子亏损。计算结果与已有的实验结果符合得很好。     

氩原子共振增强多光子电离谱--奇对称性里德堡态

利用脉冲放电产生氩原子亚稳态4s2[3/2]°2和4s′2[1/2]°0,在610～670nm波长范围内,利用共振增强多光子电离和飞行时间质谱技术得到氩原子(2+1)REMPI谱.光谱分析表明所有谱线来源于氩原子4s2[3/2]2和4s′2[1/2]°0两个亚稳态向16个奇对称性里德堡态双光子跃迁,并标识所有谱线.同时首次在实验上观察到一个长序列的3p54s′2[1/2]°0→3p5nd2[1/2]°1(n=8～31)双光子跃迁.在实验技术上,提供了一种研究惰性气体原予以及其它原子高里德堡态和自电离态的新方法.     

Spectroscopy and scattering matrices with nitrogen atom: Rydberg states and optical oscillator strengths

The scattering matrices of ${\rm e}+ {\rm N}^{+}$ with $J^\pi=1.5^{+}$ in discrete energy regions are calculated using the eigenchannel R-matrix method. We obtain good parameters of multichannel quantum defect theory (MQDT) that vary smoothly as the function of the energy resulting from the analytical continuation property of the scattering matrices. By employing the MQDT, all discrete energy levels for N could be calculated accurately without missing anyone. The MQDT parameters (i.e., scattering matrices) can be calibrated with the available precise spectroscopy values. In this work, the optical oscillator strengths for the transition between the ground state and Rydberg series are obtained, which provide rich data for the diagnostic analysis of plasma.     

Al Ⅱ1P10序列能级结构的多通道量子亏损理论分析

本文利用多通道量子亏损理论(MQDT),分析了Al Ⅱ受干扰序列¹P₁⁰的能级结构。分析表明,主序列3snp ¹P₁⁰受到了来自双激发态3p4s ¹P₁⁰的强烈干扰。这种相互作用使3p4s¹P₁⁰分布到整个3snp¹P₁⁰之中,而不再对应于一条单独的谱线。利用拟合能级实验数据所得的MQDT参数,计算了序列3snp¹P₁⁰中n≤50的能级。对于已测得的能级,计算结果与实验值符合得很好。 关键词：     

铅原子J=2偶宇称Rydberg系列组态相互作用对光谱强度的影响

实验获得了碳族原子铅的偶宇称J=0和2的束缚Rydberg态能级,利用六通道模型分析了铅原子J=2的束缚Rydberg系列之间强烈的组态相互作用对电离光谱的影响.     

一价镧离子高n里德伯态

基于五步激光共振激发,经由中间态(Xe) 5d6d~3F_2的一价镧离子光谱,分析了该实验谱,确定了一价镧离子一强一弱两个自电离里德伯系列.同时利用多通道量子亏损理论(MQDT)框架下的相对论多通道理论(RMCT)计算,标识了这两个自电离里德伯系列,强的自电离里德伯系列标识为5dnp(5/2,1/2)_3和/或5dnp(5/2,1/2)_2,弱系列标识为为5dnf(5/2,5/2)_3和/或5dnf(5/2,5/2)_2.根据实验谱峰数据,发现有效量子数很高时,里德伯和自电离里德伯能级量子数亏损随激发能量不平滑变化,并分析了可能的原因.     

Application of electric field ionization method to detect the high-lying Rydberg states of Eu I

The 4f~76s(~9S)np 8 P J (J = 5/2, 7/2, 9/2) Rydberg series converging to the first ionization limit 4f 7 6s 9 S 4 of the Eu atom using the three-step laser excitation and electric-field-ionization (EFI) method are studied. First, the Eu atom is excited from the 4f 7 6s 2 8 S o 7/2 ground state to the 4f 7 6s7s 8 S o 7/2 state through the 4f 7 6s6p 10 P 9/2 state by the first two dye lasers. Next, it is populated to many higher-n members of the 4f 7 6s( 9 S)np 8 P J Rydberg series by the third dye laser whose wavelength is scanned within a certain range. Finally, the atom in these higher-n states is ionized by the external pulsed electric field. With the field strength up to 2 kV/cm, we can detect the atom in 4f 7 6s(9 S)np 8 P J states with n 40. With the given laser line width, the level energies of Rydberg states with n as high as 72 can be determined. We not only confirm the previous data on the 4f 7 6s(9 S) np 8 P J Rydberg series, but also extend the n-value assignment significantly by detecting more states.     

钡原子6p3/2ns自电离里德伯态的研究

用激光多步激发技术研究了处于6p1/2电离限以下的6p3/2ns自电离态的光谱。 并利用最新的R矩阵的计算结果, 结合多通道量子亏损理论进行了理论分析。 理论结果与实验光谱相符合。