Experimental Studies Of Characteristic And Non-characteristic X-ray During Highly Charged Ions Interactions With Solid Targets

In this thesis,we complete the measurements for the photon emission during the interaction between highly charged ions and materials.The microprocess of the ion-material interaction can be obtained by this measurement.Hence,we can simulate spatial photon emission with appropriate ions and target materials,and obtain the mechanism of spatial photon origin,which also provides important data for astrophysics and space plasma physics and so on.First,in the experiments of the present work,X-ray emissions are measured by the interaction of 1500–3500 ke V Xeq+(q = 12,15,17,19,21,23,26 and 29)ions with Zn targets.The characteristic X-ray and non-characteristic X-ray are observed simultaneously.When q < 29,we observe Ll,L?,L?1,L?2 and L? characteristic X-rays from Xeq+ ions,radiative Auger effect peak and a broad M-shell molecular orbital(MO)X-ray band from the transient quasi-molecular levels.It is found that characteristic X-ray production cross sections(?cha),molecular orbital X-ray production cross sections(?MO)and their ratio(?cha/?MO)quickly increase as the incident energy increase.It means that the production of the characteristic X-ray and molecular orbital X-ray are competitive with each other,and the reason for this is that they share the same Zn 2p vacancies.With the change of the charge states,the production cross sections for all spectral lines have not changed much.In addition,the experimental results show that the full width at half-maximium(FWHM)of the broad MO X-ray bands are about 0.9–1.32 ke V over the energy range studied and are proportional to V1/2(V = projectile velocity).Most remarkably,when the projectile charge state is 29,several new “splitting” spectra appear in the same region as the molecular orbital X-ray energy,which are observed for the first time in the experiments.Further analysis indicates that the reduction of the effective transition range when q=29 leads to this phenomenon.Then,during the interactions of the Cu9+ ions with the thin Zn target,both target and projectile K X-rays are detected.It gives experimental evidence for K-vacancy sharing between two partners.By comparing the total ionization cross sections with the different theoretical estimations,we infer the origin of the initial K vacancy.At last,the visible light emission is measured by the interaction of Xeq+(q=10,13,15,17 and 21)ions with Al target at 410 ke V.Seven spectra in wavelength range 300–500 nm are recorded,including the photons from Al atoms and neutralized Xe+ ions.In addition,it is found that the spectral intensity increases as the charge state increases.Further analysis indicates that when the incident charge state is less than the critical charge state,it obeys the staircase classical-over-barrier model.