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Second derivative of the Jastrow factor

Using

f(rij)=arij1+βrij,

and g(rkj)=dg(rkj)/drkj and g(rkj)=d2g(rkj)/dr2kj we find that for particle k we have

2kΨCΨC=ijk(rkri)(rkrj)rkirkja(1+βrki)2a(1+βrkj)2+jk(2arkj(1+βrkj)22aβ(1+βrkj)3)