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The charge-transfer processes at low collision energies have got significant attention because of their importance not only in basic atomic physic but also in various applications.For example,the line emission produced in charge transfer processes has been used to determine the composition and properties of particles in comets [1] and stellar wind [2,3].The so called charge exchange recombination spectroscopy(CXRS)technique [4-7] is an important diagnostic tool implemented at many fusion research facilities.The spectrum emitted in the charge process of neutral beam injection can be used to identify of the impurity species,motion,and density along the line of sight of the detector.