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Z1, Z2

These are the two forms of the Zetterling potential:[72]

V(r) = a$\displaystyle {\frac{{e^{\alpha r}}}{{r^3}}}$cos(2kFr) + b$\displaystyle \left(\vphantom{\frac{\sigma}{r}}\right.$$\displaystyle {\frac{{\sigma}}{{r}}}$$\displaystyle \left.\vphantom{\frac{\sigma}{r}}\right)^{{n}}_{}$ + V0. (2)

Subroutines used: Z1 and Z2 etc. If three parameters are specified by the PARAMS keyword they are interpreted as box lengths for a periodic system.