Coulomb interaction Gaussian screened

The reduced scattering vector is given by using the characteristic scale screening of Coulombic interaction by ideal Gaussian chains, r0, as follows... 

Fig. 5. Kratky plot for SANS data taken from solutions of starburst polyamidoamine dendrimers with seven generations in deuterated water (extrapolated to zero concentration) and comparison with the gaussian blocks dendrimer model with b = 0.48 nm, n = 10, N = 7, Nb = 3 and f = 2. Salt was added to the solution in order to screen out the coulomb interactions...

In this equation, r is the vector between the ion located on the channel axis and an individual source in the channel wall. The total potential for the interaction of an ion with the whole channel is the sum of interactions of the form of eq (5) or an equivalent potential. The first term is the Morse function and the second is a Gaussian screened Coulomb... 

Stability of motion requires G2 > 0. In some instances, it is possible to determine stability from an inspection of the functional form of V alone. This is true of a single Morse potential [28], When combined with other functional forms, however, such as the Gaussian screened Coulomb interaction, it is no longer trivial to extract stability conditions. 

Appendix A Origin of the Gaussian screened Coulombic form of the interaction between the ion and the wall source... 

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