Function arrhenius_rate_kernel 

pub fn arrhenius_rate_kernel<R>(
    temperature: Temperature<R>,
    prefactor: R,
    exponent: R,
    activation_temp: R,
) -> Result<ReactionRate<R>, PhysicsError>
where
    R: RealField,

Arrhenius reaction-rate coefficient in the Park / Gupta form

$$ k(T) = C_f,T^{\eta},\exp(-\theta_d / T) $$

where θ_d is the activation (characteristic) temperature E_a / k_B. Used for both forward and backward rates (pass the corresponding C_f, η, θ_d), and for the dominant associative-ionization channel N + O → NO⁺ + e⁻ that grounds the ionization relaxation time τ_ion = 1 / (k_f · [M]).

Arguments

• temperature — rate-controlling temperature T (K).
• prefactor — C_f.
• exponent — η.
• activation_temp — θ_d = E_a / k_B (K).

References

• Gupta, Yos, Thompson & Lee, NASA RP-1232 (1990), Table II, eq. 3a (papers/gupta_1990_nasa_rp1232.pdf).
• Park, J. Thermophys. Heat Transfer 7(3):385 (1993).