def _LJ_rminepsilon_to_ab(coeffs):
    """
    Convert rmin/epsilon representation to AB representation of the LJ
    potential
    """
    A = coeffs['epsilon'] * coeffs['Rmin']**12.0
    B = 2 * coeffs['epsilon'] * coeffs['Rmin']**6.0
    return {"A": A, "B": B}