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150 M. DEFRANCESCHI ET AL.
known transcendental functions. In the case of s-functions, two basic integrals,
respectively denoted by and have to be solved to obtain
The details of the calculations can be found in Ref. 35, the final expressions are :
and Daw dx is the so-called Dawson function. The individual terms
appearing in Eq. 24 are :
Nuclear attraction term:
