BycombiningtheB-splinebasissetwithmodelpotential(B-spline+MP),wepresentoscillatorstrengthspectraofRydbergLiatomsinexternalfields.Thephotoabsorptionspectraareanalyzed.Overthenarrowenergyrangesconsideredinthispaper,thestructureofthespectracanbeindependentoftheinitialstatechosenforagivenatom.Ourresultsareingoodagreementwithprevioushigh-precisionexperimentaldataandtheoreticalcalculations,wheretheR-matrixapproachtogetherwithmultichannelquantumdefecttheory(R-matrix+MQDT)wasused.ItissuggestedthatthepresentmethodscanbeappliedtodealwiththeoscillatorstrengthspectraofRydbergatomsincrossedelectricandmagneticfields.
