高l态对镁原子自由离光谱的影响

采用多通道量子数亏损理论与Ｋ反应矩阵相结合的理论处理方法，研究了高ｌ组态３ｐｎｌ，（ｌ＝４）对于镁原子３ｐｎｄ（Ｊ＝３）自电离光谱的影响在处理中引入３ｐｎｇ（Ｊ＝３）组态的影响后能够完整地描３ｐｎｄ（Ｊ＝３）自电离光谱，通过对自电离光谱的细微结构的研究，讨论了有关的实验现象的物理机制，理论结果与实验一致。     

组态相互作用效应对类钠铜离子自由离速率和分支比的影响

根据组态相互作用理论，研究了组态相互作用对类钠铜离子自电离组态２ｐ＾５３ｓ３ｌ（ｌ＝０，１，２）自电离速率和分支比的影响。结果表明，与单组态近似下的计算相比，组态相互作用显著地改变了上述组态各能级的自由离速率而且使２ｐ＾５３ｓ＾２组态的自电离分支比减少；使２Ｐ＾５３ｓ３ｄ和２ｐ＾５３ｓ３ｄ组态的自电离分支比增加较为明显。     

组态相互作用效应对类钠铜离子自电离速率和分支比的影响

根据组态相互作用理论，研究了组态相互作用对类钠铜离子自电离组态２ｐ⁵３ｓ３ｌ（ｌ＝０,１，２）自电离速率和分支比的影响．结果表明，与单组态近似下的计算相比，组态相互作用显著地改变了上述组态各能级的自电离速率而且使２ｐ⁵３ｓ²组态的自电离分支比减少；使２ｐ⁵３ｓ３ｄ和２ｐ⁵３ｓ３p组态的自电离分支比增大；尤其是２ｐ⁵３ｓ３ｄ组态的自电离分支比增加较为明显。     

类钠铜离子的激发自电离

在扭曲波库仑玻恩交换近似下计算了类钠铜离子２ｐ^６３ｓ＋ｅ^-→２ｐ⁵３ｓ３ｌ＋ｅ^-（ｌ＝０，１，２）的内壳层激发截面．结合单组态近似和组态相互作用两种情况下计算的自电离分支比，计算了上述组态的激发自电离截面．结果表明，在入射电子能量为１０９０ｅＶ时，组态相互作用使２ｐ⁵３ｓ３ｄ总的激发自电离截面增大至单组态近似的近两倍；而使２ｐ⁵３ｓ²组态的激发自电离截面减小为单组态近似的３６％；２ｐ⁵３ｓ３ｐ组态的激发自电离截面只是略有下降 关键词：     

Mg原五3p3／2nd系列自电离分支比的研究

利用多通道量子亏损理论（ＭＱＤＴ），结合已知的Ｋ矩阵，研究了受实验条件限制目前无法得到的Ｍｇ原子３ｐ３／２ｎｄ（Ｊ＝１，３）系列的民离分支比，同时对３ｐｎｄ系列的部分自电离光谱作了计算，并取得了和实验比较吻合的结果。结合分支比研究结果探讨了Ｍｇ原子的能级结构特点及粒子数反转的可能性。     

e／f宇称对CO（A^1П）振动传能截面的影响

采用光学双共振多光子电离技术在静态池条件下测量了ＣＯ Ａ＾１П（ｖ＝３）能级上的绝对（Ｊ→Ｊ＇）转动传能截面，其中在Ｊ＝３￣１６、（ｅ，ｆ）被选择研究了；碰撞拌分别为Ｈｅ、Ｎｅ、Ａｒ、ＨＣｌ、ＣＯ２。在以上传能过程中发现明显的宇称守恒的倾向性规则。用能隙规则能很好地拟合大部分实验数据，并且采用Ａｌｅｘａｎｄｅｒ等人的非弹性散射理论来解释宇称守恒定则。但是，当ΔＪ＝０时，对于碰撞伴Ａｒ、ＨＣｌ、ＣＯ     

Nb^30＋,Na—like离子自电离速率和自电离分支比

用组态相互作用方法，研究了Ｎｂ３０＋，Ｎａ－ｌｉｋｅ２ｐ５３ｌ３ｌ′（ｌ，ｌ′＝０，１，２）内壳层电子激发跃迁的自电离速率和自电离分支比，结果表明自电离速率对自电离分支比的贡献最大。     

自电离序列间的相互作用

本文采用多通道量子数亏损理论对Ｍｇ原子的Ｊ＝３,３ｐｎｄ自电离Ｋｙｄｂｅｒｇ序列间的相互作用进行了分析，研究了通道相互作用对于自电离态的线形，自电离速率的影响。考察了在电离限附近原子的特性以及在其两侧电子的波函数的连续性，获得了与实验相一致的自电离光谱。 关键词：     

氯代苯分子3d Rydberg态的共振多光子电离光谱研究

用共振多光子电离（ＭＰＩ）技术，结合飞行时间质谱（ＴＯＦＭＳ），对氯代苯（Ｃｌ）分子的３ｄＲｙｄｂｅｒｇ态进行了研究。在λ＝（４７３．０ｎｍ～４８３．０ｎｍ）范围内所获得的光离子光谱呈现出明显的可分辨的结构。经分析为３ｄ态的（３＋１）共振多光子电离，光谱结构可能为３ｄ态振动能级的反映，考虑跃迁选律，对这些结构进行了尝试性指认。     

CH^35Cl3和CH^35Cl2^37Cl分子V=3的傅里叶变换光谱研究

采用傅里叶变换光谱技术（ＦＴＳ）记录了ＣＨ＾３５Ｃｌ３和它的同位素分子ＣＨ＾３５Ｃｌ２＾３７Ｃｌ的Ｖ＝３的高分辨光谱，由于０．０２ｍ＾－１分经不足以分辨Ｋ结构，我们将所观察到的谱线近似归属为Ｋ＝０的转动能级，归属了ＣＨ＾３５Ｃｌ３岔子４〈Ｊ〈７３，ＣＨ＾３５Ｃｌ＾３７Ｃｌ分子６〈Ｊ〈５３的转动级。最后采用最小二乘法拟合，得到了关于Ｊ的转动常数和振动带心。     

Saturation effects on Ba 6phi （l=0, 2） and 6pnk （｜M｜= 0, 1） autoionization spectra

Using a three-step laser saturation excitation technique, the saturation effects on the Ba 6pns （J = 1） and 6pad （J = 1, 3） autoionization spectra are observed systemically in zero field. These saturation spectra are introduced to determine the high n members of 6pnl （l = 0, 2） autoionizing series and are used to analyse the channel interactions among the autoionizing series in zero field. Furthermore, the saturation excitation technique is applied to the electric field case, in which the saturation spectra of Ba 6pnk （｜M｜= 0, 1） autoionizing Stark states are measured. Most of these saturation spectra are observed for the first time so far as we know, which indicate the mixing of the autoionizing states in the electric fields.     

Yb的激光三步激发自电离谱

用激光三步共振激发研究Yb原子的自电离谱,测得能量在50443一57750cm^-1范围内的16个自电离能级。并用偏振光技术测定两个自电离态的J值。 关键词：     

Eu原子4f~76p_(3/2)ns自电离态的光谱的研究(英文)

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。     

Double photoexcitation of helium in a strong dc electric field

We report the first experimental measurements of the effect of an applied field on the photoexcitation and autoionization of doubly excited states of helium. Ground-state photoionization spectra have been measured in the region below the He+(N=2) threshold with static electric fields of up to 84.4 kV/cm across the interaction region. The results are compared to the theoretical calculations of Chung et al. [J. Phys. B 34, 165 (2001)]], which are the only calculations available in this regime. Transitions to several states in the N=2, n=6 manifold are assigned, and a wealth of new structure is observed. Our data show that many more series are mixed in by the field than those predicted by theory.     

Angular resolved autoionization spectroscopy of N2 on Ni(110)

Angular resolved autoionization spectra after core to bound excitation of N₂ adsorbed on Ni(110) are presented. The experimental autoionization spectra are compared with calculated spectra for the model system Ni---N---N by application of the many-body Green's function technique using SCF-MO-CNDO one particle wavefunctions. The angular dependences of the autoionization lines are explicitly calculated. The theoretical approach allows one to assign the spectra obtained after core to bound excitation including angular effects within the framework of molecular orbital theory. The assignment is compared with results for the CO on Ni(110) system.     

铕原子4f76pns系列自电离态的光谱和动力学过程

通过共振激发技术和速度影像法对铕原子4f⁷6pns（n=7,8）自电离态进行了系统性的研究。首先采用三步共振激发技术探测光谱,通过前两步固定波长的激光将铕原子激发到4f⁷6p²态上后扫描第三步激光的波长,使得三步激光的能量总和位于铕原子4f⁷6pns（n=7,8）自电离态能域附近,从而得到该自电离态的光谱;然后采用速度影像法对其动力学过程进行探测,经过数据分析得到铕原子4f⁷6pns（n=7,8）自电离态的衰变分支比和弹射电子的角分布。不仅从光谱中观察到了强烈的组态相互作用并且确定了部分能态的总角动量,从自电离弹射电子角分布中观察到铕原子4f⁷6pns（n=7,8）自电离态复杂的物理机制,还在该能域内观测到了粒子数反转。最后,本文还对孤立实激发技术在探测低n值自电离态光谱的适用性进行了讨论。     

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.     

Complete two-electron spectra in double photoionization: the rare gases Ar,Kr, and Xe

A new spectroscopic technique, giving complete two-dimensional e(-)-e(-) coincidence spectra in single photon double photoionization, is presented. The technique resolves the states of doubly charged ions and provides spectra of the individual electrons emitted in formation of each final dication state. Complete spectra for double photoionization of Xe, Kr, and Ar at photon energies up to 51 eV have been recorded. Overall and surprisingly, the np(4) 3P, 1D, and 1S states are populated according to their statistical weights. When the evident autoionization is excluded, the supposedly favored 3P states are in fact disfavored. Detailed information on the autoionization processes is also made available.     

Branching ratios of autoionization from Eu 4f~76p_(1/2)6d [J] autoionizing states

The autoionization branching ratios from Eu 4f76p1/26 d [J] autoionizing states to its 4f76s+(9So), 4f76s+(7So), and4f75d+(9Do) final ionic states are investigated with the combination of the three-step laser excitation and the velocity-map imaging technique. These different autoionizing states are excited via 4f76s6d8 DJ [J = 5/2, 7/2, and 9/2] intermediate states, respectively. The experimental photoelectron images are obtained, from which energy distributions of ejected electrons are achieved with the mathematical transformation. Furthermore, the energy dependence of the branching ratio is investigated within the autoionization resonance, by which population inversion is observed as an important characteristic.The J-dependence is also studied systematically. The validity of the well-known isolated core excitation technique used for obtaining the autoionization spectrum is also studied.