<div>Dear CP2K team,</div><div><br /></div><div>I performed simple tests for H2 with cp2k-9.1 using an input file from <b>cp2k/tests/QS/regtest-rtp-2</b> and modifying the external field (the input file is attached). I then performed 4 tests, using ETRS or CN propagators and two different time steps, dt=0.25 a.u. and 0.125 a.u. With the ETRS propagator, the energies as well as the H atom dynamics are the same for both dt values. However, the results with the Crank-Nicolson propagator (CN) are not only different for two time steps, but also are completely different from when using ETRS. I attach the results here. I tried refining some other parameters, but the two propagators always lead to different EMD.<br /></div><div><br /></div><div>My question: when performing Ehrenfest dynamics with applied external field, which propagator should I trust? Why they give such different results?</div><div><br /></div><div>Best regards,</div><div><br /></div><div>Natalia<br /></div><div><br /></div>
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