Investigation Of X-ray Emission In The Interaction Of Slow Highly Charged Ions With Solid Surface

The k shell X-ray emission of Ar^q+(q=15,16,17,18)ions is measured in this work.The targets are Be,Al,Ni,Mo,Au,and the incident energy ranges from 190 keV to 450 keV. The main results and theory explanation are discussed in the following:For Ar¹⁷⁺ions,the K_β/K_αand energy of the K_α,K_βX-ray has been obtained by analysing the X-ray spectrum.The theoretical explanation is in the framework of multi-step cascade model.K shell X-ray emission of Ar¹⁶⁺ions is the key work in this work.It is considered that the k shell vacancy is produced by the internal multi-electron excitation.The difference of X-ray intensity between the Ar¹⁷⁺ions and the Ar¹⁶⁺ions is explained in our mode.The consistency of experiment results and theory confirm the multi-step cascade model is successful.For Ar¹⁸⁺ions,the intensity of the k shell X-ray is about 2 times to the Ar¹⁷⁺ions. Considering the k shell vacancy,we conclude the number of vacancy in k shell is important for the k X-ray emission.In the end,a reasonable explanation is given for that the K Shell x-ray emission of the Ar¹⁵⁺ions can not be measured.