Heavy Element Atoms, Ions, Forbidden Transitions Research And Decomposition Studies, Based On The Ebit Plasma

Forbidden lines are very useful in plasma diagnostics,such as the determination of the electron density and temperature.We did some research on forbidden lines of heavy elements,and they are as follows:â… .We presented a systematic calculation along the zinc-like sequence.The excitation energies for the 4s4p ^1,3p levels,and the transition probabilities for the transitions within the 4s4p ^1,3p levels and between these levels and the ground state,are given.Our focus is on the spin-forbidden line 4s^{2 1}S₀ - 4s4p ³P₁ and the hyperfine induced transition(HPF) 4s^{2 1}S₀ - 4s4p ³P₀.Our results for the excitation energies,pointed out the possible misidentification of the ³P₂ or ³p₀ levels in Zr¹⁰⁺,Mo¹²⁺ and Rh¹⁵⁺.Plus,we presented the transition probability for the HPF transition along the zinc-like ions for the first time.This work was published in Journal of Physics B.â…¡.A systematic calculation was performed for the ground term splitting [Kr]4d^{9 2}D_3/2,5/2 and the lifetime of the ²D_3/2 level along the rhodium-like sequence. The difference between our calculated results and available experimental values is on the level of 0.1%,and the calculated result for Xe X explained the discrepancy between the previous calculated value and the experimental value.Based on this work,I proposed the experiment on the direct measurement of the ground term splitting for the Rh-like Ba,which has been performed in Tokoyo CoBIT (Compact EBIT) by Professor Zhang Xuemei.The paper about the theoretical work was prepared already.â…¢.We performed a large scale calculation on the excitation energy of the 5s5p ^1,3p levels in Sr I.The transition probabilities for the transitions within the 4s4p ^1,3p levels and between these levels and the ground state,are given as well. Our focus is on the lifetime of the ³P₂ level,of which the lifetime difference between the previous calculated value and experimental one is very huge.Our calculated value supports the theoretical one rather than the experimental one.This work was published in Physical Review A.â…£.A large scale calculation on the excitation energy of the 7s7p ^1,3p levels in No I was performed,to guide the forthcoming experiment.Our calculated result supports one of the previous two theoretical results,and the different between them is around 10%.This work was published in Physical Review A.The above is the main part of this thesis,and the other part is about two experiments performed on EBIT(Electron Beam Ion Trap).EBIT is a combination of the light source and the ion source,in which the produced highly charged ion are trapped.Many atomic processes occur inside EBIT,and one can do spectroscopy research based on the emission photons among the atomic processes.Besides,one can extract the highly charged ions to do kind of surface collision experiment.One experiment is on the radiative recombination measurement for bare and hydrogen-like Kr.This experiment was performed on Shanghai EBIT,and the result was used to estimate the ion density inside Shanghai EBIT.This work was published in Journal of Physics:Conference Series.The other experiment is on the direct measurement of the ground term splitting for the Rh-like Ba.This experiment was performed on the Tokoyo CoBIT (Compact EBIT).