A</span><span class="o">.</span><span class="n">methods</span><span class="o">.</span><span class="n">non_interacting</span><span class="o">.</span><span class="n">kinetic_energy_operator</span>
<span class="n">external_potential_operator</span> <span class="o">=</span> <span class="n">iDEA</span><span class="o">.</span><span class="n">methods</span><span class="o">.</span><span class="n">non_interacting</span><span class="o">.</span><span class="n">external_potential_operator</span>
<span class="n">hartree