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In this work we expand on this idea providing more generality and utility to the theory by generalizing to higher-order kinetics. For this work we propose a generalization of our previous first order irreversible decay kinetics to higher orders, with complete framework analyzing any $n^{th}$ order system with this description. In this work we propose a method for studying these more complex cases in chemical kinetics proposing theory to analyze disorder in $n^{th}$ order kinetics and provide detailed proof-of-principle analyses for second order kinetics for irreversible decay phenomena. We then connect this theory to previously accepted work on first order kinetics showing how the model simplifies in a consistent manner when working with first order models.
We consider the irreversible
elementary reaction types
\begin{equation}
A^i \to \mathrm{products}\quad\quad\textrm{for}\quad i=1,2,3,\ldots,n
\end{equation}
with the
differential rate laws
\begin{equation}
\frac{dC_{A^i}(t)}{dt} \frac{dC_i(t)}{dt} =
k_i(t)C_{A^i}(t). k_i(t)\left[C_i(t)\right]^i.
\end{equation}
Experimentalists deduce rate laws from Experimental data
corresponding corresponds to the integrated
form of the rate
law. law, a concentration profile. For
example, in the case of the $i^{th}$-order
reaction reaction, the traditional integrated rate
law, with $k_i(t)\to\omega$ law and a rate ``constant'', $k_i(t)\to\omega$, is
\begin{equation}
\frac{1}{C_A(t)^{i-1}} \frac{1}{C_i(t)^{i-1}} =
\frac{1}{C_A(0)^{i-1}}+(i-1)\omega \frac{1}{C_i(0)^{i-1}}+(i-1)\omega t.
\end{equation}
Survival functions are Normalizing the
input to our theory. They are a measure of concentration profile, by comparing the concentration of
species $A$ at a time $t$
compared to the initial
concentration concentration, leads to the survival function
\begin{equation}
S_i(t) =
\frac{C_{A^i}(t)}{C_{A^i}(0)} \frac{C_i(t)}{C_i(0)} = \sqrt[i-1]{\frac{1}{1+(i-1)\omega
tC_{A^i}(0)^{i-1}}}, tC_i(0)^{i-1}}},
\end{equation}
which
come from we will use as the
integrated rate law. input to our theory.