Spectroscpic Studies Of Highly Ionized Cu Atoms By Means Of Beam-Foil Spectroscopy

Highly ionized atoms have several properties that differ from those of neutral and few times ionized atoms. Since the nuclear charge Z greatly exceeds the charge of the remaining electrons, there are large magnetic effects. The 'allowed' electric dipole(El) transitions will encounter strong competition from 'forbidden' transitions, i.e. magnetic dipole(Ml), electric quadruple(E2) and other higher order transitions. The transitions rates for the forbidden decay scale with higher powers of Z than those of E1 transitions. The effects of quantum electrodynamics(QED) also scale with higher power of Z. Accelerator-based beam-foil spectroscopy(BFS) is an important method for spectroscopic studies of highly ionized atoms. The Motivation for spectroscopic studies of highly ionized atoms is that they are important for testing basic atomic theory, because they sensitively probe interelectron correlations, relativistic and quantum eletrodynamic correlations, and effects due to the finite size of the nucleus. Also, such ions have important application in the development of X-ray lasers, the diagnostics of fusion plasmas, and the interpretation of spectra from space.The spectra of Cu was measured by means of the beam-foil technique. Copper ions of 80 and 110 MeV energy from the HI-13 tandem accelerator atthe China Institute of Atomic Energy were used, and the wavelength region 11-38nm was measured. 65 lines were classified, among these lines, 16 have not been reported in experiments previously.This paper mainly consists of five parts. The first part content is the meaning and recent progress on the study of beam-foil spectroscopy.The second part presents the experiment principle and method of beam-foil spectroscopy.The third part introduces the experimental equipment and method.The forth part investigates the spectra of highly ionized Cu by means of the beam-foil technique.Finally we summarize the obtained results and discuss the future work on the spectroscopic studies of highly ionized atoms.