Thermal reaction probability integral
= Thermal reaction probability integral
{title2=$kQ_r=\frac{1}{2\pi\hbar}\int_0^\infty e^{-\beta E}P(E)\,dE$}
For a one-dimensional channel, $k(T)Q_r=(2\pi\hbar)^{-1}\int_0^\infty e^{-\beta E}P(E)\,dE$. The reactant <partition function> and any length normalization must be specified.