# Poisson1DSoftCoulombParam

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#### Poisson1DSoftCoulombParam

Section Hamiltonian::Poisson
Type float
Default 1.0 bohr

When Dimensions = 1, to prevent divergence, the Coulomb interaction treated by the Poisson solver is not $1/r$ but $1/\sqrt{a^2 + r^2}$, where this variable sets the value of $a$.

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