To align the model and experiment, we fitted the parameters of our model to the experimental data. The expression for the Q max (Equation ) was fitted to the observed experimental trend by varying parameters from Equations 29, that are used in Equations 28. A fit for χ and η included only a single parameter, with χ(1) and η(1) being taken from the experimental IP and EA values of the helium atom. The energy expression (Equation ) was taken with parameters from the literature, namely ε ∞ = 0.621 [meV], ε 2/3 = 1.526 [meV], and ε 1/3 = 0.513 . Due to numerical instabilities of the fit, the smallest possible ξ = 0.4 was taken. The fitting resulted in a curve reproducing the observations, as can be seen from Figure . This shows the potential of the proposed model for describing experimental observations.