利用少有的共线快离子激光光谱学方法研究了LaⅡ的超精细结构,测量了5d21G4态→4f5d1F3态的超精细结构光谱,分别得出了相应的磁偶极矩和电四极矩的超精细相互作用常数.

The knowledge of the hyperfine structure of 139LaⅡ has been very poo r until now.In our experiment,the atomic hyperfine structure spectra of 139 LaⅡ with 5d2 1Ｇ4 and 4f5d 1F 3 configurations have been measured using collinear fast-ion-beam las er spectroscopy,and the magnetic dipole and electric quadrupole coupling constan ts were determined.

The knowledge of the hyperfine structure of La-139 II has been very poor until now. In our experiment,the atomic hyperfine structure spectra of La-139 II with 5d(2) (1)G(4) and 4f5d F-1(3) configurations have been measured using collinear fast-ion-beam laser spectroscopy,and the magnetic dipole and electric quadrupole coupling constants were determined.

Atomic spectra of singly ionized praseodymium and neodymium have been measured by means of the collinear laser-ion-beam spectroscopy. Hyperfine structures of 19 atomic transitions in the wavelength range from 560 to 590 nm were resolved and hyperfine structure constants A and B were determined for 28 levels.

The hyperfine structure of the transitions 4f3(4Io)5d 3I5 o–4f3(4Io)6p 5I5 (578.77 nm) and 4f3(4Io)5d 3I6 o–4f3(4Io)6p? (J=5) (587.04 nm) of 141PrII has been measured by collinear laser‐ion‐beams spectroscopy. The magnetic‐dipole constant A and the electric‐quadrupole constant B of the involved levels have been determined.

Atomic spectra of singly ionized neodymium have been measured by collinear fast-ion-beam laser spectroscopy. The resonant spectra in the lines of 568.9, 570.8, 572.7, and 574.1 nm in Nd II were obtained and the optical shifts were determined. We obtained the optical shifts of all the five even isotopes (142-150) in Nd II The accuracy of our results was improved by one order of magnitude compared with other published results.

The hyperfine structure of the levels 5d2D3/2 and 6p2P3/2 in BaⅡ was studied by collinear fast-ion-beam laser spectroscopy. The isotope numbers of BaⅡ in our experiment are 135 and 137, and the hyperfine structure parameters of each level are given.

采用共线快离子束激光光谱学方法研究了钡离子亚稳态５ｄ２ Ｄ３／２ 和激发态６ｐ２ Ｐ３／２ 的超精细结构，并定出了相应的超精细结构常数．

本文介绍了（ｅ，２ｅ）电子动量谱仪的计算机控制系统，以及计算机通讯技术在（ｅ，２ｅ）实验中的应用。本文较为详细地介绍了系统的硬件设计、软件和工作原理。

We briefly present in this paper the results of 1200eV non-coplanar symmetric (e, 2e) binding energy spectrum of argon and an electron momentum profile of argon 3p. They were measured by a newly constructed spectrometer with position-sensitive detectors in USTC. We use non-binning mode to get the Ar3p, 3s and 3s satellites binding energy spectra separately. The experimental results is well consistent with the available theoretical results.