Dear Cp2k community,<br><br>  I am wondering whether the Douglas-Kroll-Hess relativistic effect implemented in CP2k includes spin-orbit interaction?<br><br>  In other words, does the DKH Hamiltonian have one or two components?<br>
<br>  Thanks.<br><br>Hanning Chen<br><br>Department of Chemistry<br>Northwestern University<br>Evanston, IL 60091<br>