Process. Class Nickel, Such As The Department Of Electronics Ion Dielectronic Recombination And Resonant Excitation

The theoretical calculations on electron impact cross sections and rate coefficients from excitation and recombination processes are very important in astrophysics, plasmas,ultraviolet or x-ray laser studies,and closely associated with the EBIT (electron beam ion trap) project progressing in Institute of Modern Physics of Fudan University.With regard of the necessity of application,we theoretically study the resonant excitation processes for nickel-like ions and the dielectronic recombination (DR) for Ni-like ions using distorted-wave born-exchange(DWBE) approximation, including:1.Systematic theoretical study of DR rate coefficient for the Ni-like isoelectronic sequence ions.(1)We take the take the Ni-like Kr,Nd,U ions as example to investigate the detailed energy levels vary with the Z of ions.(2) We take the Ni-like Kr,Nd,U ions as example to investigate the dependence of partial DR rate coefficients on orbital angular momentum l'of the ground state of Ni-like Kr,Nd,U ions through each complex series.(3) We take the Ni-like Kr,Nd,U ions as example to investigate the dependence of partial DR rate coefficients of the ground state Kr⁸⁺,Nd²²⁺,U⁶⁴⁺ on primary quantum number n',with the inclusion of DAC transitions.The results shown that the inclusion of DAC transitions breaks the n'^-3 scaling law.(4) To evaluate the high n' contributions from those complex series for which DR rate coefficients do not scale like n'^-3,the level-by-level extrapolation method including DAC effects is developed.(5)We have studied the influence of DAC effects to the total rate coefficients.(6)We take the Ni-like Kr,Nd,U ions as example to study the contribution of each core exitation to the total coefficients.(7)We choose the rate coefficients of 13 ions to form a fitting formula,we find that this formula are applicable to more wide temperature and more Ni-like ions.(8)We compare our calculation with the results of BM approximation,and give some comments on the validaty of BM approximation. Systematic theoretical study of DR rate coefficient for the Ni-like isoelectronic sequence ions have been submitted to Eur.Phys.J.D.2.Relativistic calculations of the resonant excitation for Ni-like ions.(1) The dependence of partial DR rate coefficients on orbital angular momentum l' of the ground state Kr⁸⁺,Nd²²⁺,U⁶⁴⁺ through each complex series is investigated.(2) The dependence of partial DR rate coefficients of the ground state Kr⁸⁺,Nd²²⁺,U⁶⁴⁺ on primary quantum number n',with the inclusion of DAC transitions,are respectively studied and the level-by-level extrapolation method including DAC effects is developed.(3) The contributions from each doubly excited states of Cu-like ions to resonant excitation are discussed.The results show that those resonant states neglected by other theory have a non-neglectable effect on the resonance excitation processes.(4) Radiation damping effects which are neglected by R-matrix method due to the limit from large amount of resonant states are discussed.We find that radiation damping are important for resonant excitation.(5) In detail,we have studied several physical problems,including of the contribution of each core-excitation processes.(6) The contribution of the resonant excitation and the impact of the radiation damping to the total excitation rate coefficients for Ni-like ions are analyzed,and large resonance contributions and radiation damping are found for many excitation processes.(7) we take the Ni-like Kr,Nd,U ions as example and compare our calculation of RE rate coefficients with the results of others.The systematical studies for Au⁵¹⁺ have been submitted to J.Quant.Radiat.Spect. Transfer.