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This paper continues the preceding paper on the problem of quantum dynamicson the lattice. Firstly we consider the multiple reflections of the wavefunction (Loschmidt echo). The phenomenon of wave function concentration on theimpurity site after reflections is found. The solution representing the totalamplitude $a(t)$ is obtained as the series in terms of partial amplitudes$a_k(t)$. The contribution of $k$th partial amplitude becomes dominant onlyafter $k$th reflection from the lattice end. An excellent agreement betweenanalytical and accurate numerical results is obtained. Next problem, -- wavepacket trapping by defects, is solved by numerical simulation. Analyticalexpressions are derived in few cases allowing to estimate the quantumefficiency of charge transfer. Obtained results can qualitatively explainrecent experiments on the highly efficient charge transport in olygonucleotidesand polypeptides.

"Ping-pong" electron transfer. II. Multiple reflections of the Loschmidt echo and the wave function trapping by an acceptor