><br>
<i>Optional</i><br>
Default: 0.0<br><br>
Sets the total charge of the system. 0 is a neutral system. -2 is a doubly charged anion etc.</li><br>
<hr>
<a name=electric_field_x><li>                 <span style="display:inline-block;background:#EEEEEE;width:400px">               <b>electric_field_x</b>  </span>  
<br><br>
<i>Optional</i><br>
Default: 0.0<br><br>
Sets the magnitude of the electric field along x</li><br>
<hr>
<a name=electric_field_y><li>                 <span style="display:inline-block;ba