Function polymers::physics::single_chain::fjc::thermodynamics::isometric::helmholtz_free_energy

pub fn helmholtz_free_energy(
    number_of_links: &u8,
    link_length: &f64,
    hinge_mass: &f64,
    end_to_end_length: &f64,
    temperature: &f64
) -> f64

The Helmholtz free energy as a function of the applied end-to-end length and temperature, parameterized by the number of links, link length, and hinge mass.