= Alpha-particle assault frequency
{title2=$\nu\sim v/L$}
In a semiclassical escape model, an <alpha-particle assault frequency> is the interior rate scale multiplying the barrier <transmission probability>. Confinement alone gives $p\sim\hbar/L$ and hence $\nu\sim\hbar/(m_\alpha L^2)$ up to geometric factors. Counting encounters with either wall differs by a factor of two from returns to one wall. A stationary bound <wavefunction> does not itself follow a classical collisional trajectory.
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