# Interaction1D

A - B - C - D - E - F - G - H - I - K - L - M - N - O - P - Q - R - S - T - U - V - W - X

#### Interaction1D

Section Hamiltonian::XC
Type integer
Default interaction_soft_coulomb

When running in 1D, one has to soften the Coulomb interaction. This softening is not unique, and several possibilities exist in the literature.

Options:

• interaction_exp_screened:
Exponentially screened Coulomb interaction. See, e.g., M Casula, S Sorella, and G Senatore, Phys. Rev. B 74, 245427 (2006).
• interaction_soft_coulomb:
Soft Coulomb interaction of the form $1/\sqrt{x^2 + \alpha^2}$.

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