Studies Of The Dynamic Parameters Of ¹¹²Sn³⁵⁺,⁵⁸Ni¹⁹⁺,Argon And Nitric Oxide

As an important subfield of physics,the investigations of atomic and molecular physics mainly focus on the electronic structures,energy level structures and dynamic parameters of atoms,molecules and ions.Dynamic parameters of atoms,molecules and ions have significant applications in plasma physics,condensed matter physics,as-trophysics,chemistry,material science,biology,etc.However,the precision of the dynamic parameters of atoms and molecules are usually several to dozens percents.So it is very important to develop new experimental methods to determine the benchmark data of dynamic parameters,and to reveal the pros and cons of different experimental methods.Since ions are more difficult to produce,purify and store,ion spectroscopy matures later and there are still huge data gaps.Thus expanding the scopes of ion spec-troscopy and accumulating more data for astronomy and other related field is also very beneficial.In this thesis the dynamic parameters of 112Sn35+,58Ni19+,argon and nitric oxide are investigated,the concrete results and innovation points in this thesis are:1.Based on the main heavy ion cooling storage ring(CSRm)at the Institute of Modern Physics(IMP)in Lanzhou,China,the electron-ion recombination rate coeffi-cient spectrum of 112Sn35+ion in 0-14 eV was obtained.The FAC code has also been employed to calculate the corresponding rate coefficients.The comparison between the experimental results and the theoretical calculation reveals that the dielectronic recom-bination is the dominate recombination process,and the trielectronic recombination has a substantial contribution in the high energy region;2.The dielectronic recombination rate coefficient spectrum of 58Ni19+ons in 0-165 eV has been measured on CSRm.The measured spectrum covers the whole energy range of dielectronic recombination resonances associated with ?n= 0 core excitations to 2P1/2 and 2S1/2.The longitudinal and transverse temperatures of the electron beam under the new experimental conditions were determined.AUTOSTUCTURE has also been applied for the theoretical calculation for 58Ni19+ ions.The theoretical results are in good agreement with the experimental ones.Considering the applications to astronomical modeling,we also provide the experimental plasma recombination rate coefficients of 58Ni19+ ions and compare them with the related theoretical results;3.The generalized oscillator strengths for the valence-shell excitations of A2?+,B2?,C2? and D2?+ of nitric oxide have been determined by the fast-electron energy-loss spectrometer.The optical oscillator strengths for these transitions have been ob-tained by extrapolating the generalized oscillator strengths to the limit that the squared momentum transfer approaches to zero,and the integral cross sections for the valence shell excitations of nitric oxide were determined systematically from the threshold to 2500eV with the aid of the newly-developed BE-scaling method.In general,the present results are is in good agreement with the previous ones,which indicates that the first Born approximation is satisfied with an incident electron energy of 1500 eV for nitric oxide.The present experimental results can be used as benchmark data in the related atmospheric physics studies.4.Based on the third generation synchrotron radiation light source SPring-8,the optical oscillator strengths of the 3p54s?3p54s'?3p55s?3p53d?3p55s' ? 3p53d' excita-tions of argon were measured by the newly developed dipole(?,?)method.The results are in good agreement with those of the dipole(e,e)method and the recent lifetime measurements,and also accord with most of the theoretical results.The crosscheck between this work and previous ones can provide the benchmark data for the optical oscillator strengths of these excitations of argon.