= Sliding diffusivity with per-step dissociation
{title2=$\tau_b\simeq a^2/(2DP),\quad\ell_{rms}\simeq a/\sqrt P$}
For an unbiased one-dimensional walk with step size $a$, <diffusion coefficient> $D$ fixes step interval $a^2/(2D)$. A small dissociation probability $P$ per step gives about $1/P$ steps before release. Thus lifetime depends on $D$, while the root-mean-square net displacement before release is $a/\sqrt P$. Net displacement is not the cumulative distance along all backtracking steps. Physically impossible printed diffusivities should not be silently replaced by a guessed exponent.
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