Single-electron-detachment (SED) cross sections for 8-30 keV singly charged negative copper ions in collision with helium, neon, and argon are measured. The SED cross sections for Cu-+Ne and Cu-+Ar are found to be of similar magnitude and energy dependence, and are much larger than that for Cu-+He. A general discussion of the results is given.

In atomic spectroscopy, the subject of isotope shifts is one of the few problems that links atomic and nuclear physics. The isotope shifts among all the seven stable isotopes in Nd Ⅱ were measured by means of collinear fast-ion-beam laser spectroscopy.Compared with the data that have been published,our experimental accuracy is improved by one order of magnitude and some of the results are obtained for the first time, as far as we know.

Electron detachment of negative ions, in collision with a static gas target, is known to be one of the most fundamental processes occurring in negative-ion-atom collisions. The experimental results of cross-section data for transition element ions in collision with gases are of great interest not only for their potential application value, but also as a challenge to a theoretical study of complex negative ions in collision with atoms or molecules. In the present work, the single-electron detachment (SED) cross-sections for Cu− and Ag− in collision with He, N2 have been obtained in the energy region of 10-30 keV. By using a single-particle detector for both neutral atoms and ions, the experimental uncertainty of the results is improved in this work.

The total electron detachment cross sections for the collisions of Cu- and Ag- with He have been measured in the range of 10–30 keV by the growth-rate method. The typical value of the cross section at 20 keV energy is 7.63×10-16 cm2 for Cu-, and 6.66×10-16 cm2 for Ag-. The experimental uncertainty of the results is within ±8% in this work.

The total electron detachment cross sections for the collisions of Cu- and Ag- with He have been measured in the range of 10–30 keV by the growth-rate method. The typical value of the cross section at 20 keV energy is 7.63×10-16 cm2 for Cu-, and 6.66×10-16 cm2 for Ag-. The experimental uncertainty of the results is within ±8% in this work.

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.

The hyperfine structure of the transition 5d6s b1D2 – 5d6p 3D1o (576.91 nm), 5d6s b1D2 – 5d6p x3F3o (597.11 nm) and 5d6s b1D2–5d6p x3F2o (612.61 nm) of 139La II has been measured by collinear laser-ion-beam spectroscopy. The magnetic-dipole constants A and electric-quadrupole constants B of the involved levels were determined.

The behavior of Au/Au (100) thin film growth with energetic deposition has been investigated by kinetic Monte Carlo simulations with the description of the deposition process of energetic atoms based on molecular dynamics simulation results. We present the simulation results on the morphology, islands distribution, Bragg intensity and roughness of homoepitaxial Au (100)-films growth with energetic deposition at various substrate temperatures. We found the energetic atoms can promote the nucleation and island growth in the early stages of film growth and thus enhance the smoothness of the film surface at the temperatures of film growth in three-dimensional mode and in quasi-two-dimensional mode. The atomistic mechanism that promotes the nucleation and island growth and enhances the smoothness of the film surface is discussed.

The energetic atom deposition of thin Au/Au(100) film has been studied by molecular dynamics simulation using the Au-Au interatomic interaction potential with embedded atom method. By investigating the variation of coverage curves and Bragg diffract ion intensities during the film growth, the transition of Stranski-Kranstanov growth mode to Frank-van der Merwe growth mode was observed with the increase of the incident energy of deposition atoms. The role of energetic atoms in the film growth is discussed by analyzing the transport properties of deposited atoms and the evolution of incident energy and substrate temperatures.

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.

Atomic spectra of singly ionized praseodymium have been measured by collinear fast-ion-beam laser spectroscopy. Hyperfine structure in the 576 nm line was resolved and the magnetic dipole and electric quadruple coupling constants were determined.

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.

The hyperfine structure of the levels 5d(2)D(3/2) and 6p(2)P(3/2) in Ba YI was studied by collinear fast-ion-beam laser spectroscopy. The isotope numbers of Ba II 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．

A molecular-dynamics simulation of Au (0 0 1) thin film growth with energetic atoms was carried out. The incident-atom energies were selected as 10.0, 1.0, and 0.1 eV and two kinds of substrate temperatures, 300 and 100 K, were selected to study the effect of substrate temperature on film growth. Three kinds of film growth mode, layer-by-layer growth, layer-by-layer growth followed by 3-dimensional island formation, and 3-dimensional island growth, were observed at the condition of 300 K and higher than 1.0 eV incident-atom energy, 300 K and 0.1 eV incident-atom energy, and 100 K and 0.1 eV incident-atom energy, respectively. The surface coverage, diffracted intensity, morphology, and interface mixing of Au (0 0 1) film deposited with different incident-atom energy and the atom transport were described. The effects of incident-atom energy and substrate temperature on the film growth were also discussed in the article. © 1998 Elsevier Science B.V.

High-resolution collinear fast-ion-beam-laser spectroscopy has been applied to investigate the optical isotope shifts for transition 4f45d6K11/2-(24445)°11/2 of Nd II. From the measured optical isotope shifts, changes in mean-square nuclear charge radii δ⟨r2⟩ (fm2) among five even-even neodymium isotopes have been deduced: (142,144) 0.282, (144, 146) 0.242, (146, 148) 0.274, (148, 150) 0.404. The results are in good agreement with experimental data from electronic x-ray spectroscopy and combined optical and x-ray spectroscopy.