  The mean value theorem for integrals has been applied in constructing a base
curve for non-equilibrium thermokinetic oscillations, q(t), recorded in
oscillatory sorptions of H2(D2) in Pd. The mean values are calculated for each
period of q(t), followed by cubic spline interpolation, forming the new
non-oscillatory curve, h(t), to be used as a baseline for the oscillatory
component of the original thermokinetic time series. Crucially, areas, under
both q(t) and h(t) are strictly identical. Subsequent pointwise subtraction
q(t) h(t) yields another oscillatory time series g(t), considered the
oscillatory component extracted from the thermokinetic data. The method has
been applied to various experimental time series q(t). Using the g(t) curves, a
new parameter, the mean amplitude has been defined and used as a descriptor
correlating the intensity of thermokinetic oscillations with various
experimental conditions. The mean amplitude turns out to be a linear function
of the first ionization potential of noble gases, admixed intentionally to H2
before its contacting Pd.
