ion <span  title="" class="an ">&ensp;</span>between <span  title="" class="an ">&ensp;</span>the <span  title="" class="an ">&ensp;</span>clusters <span  title="" class="an ">&ensp;</span>The <span  title="" class="an ">&ensp;</span>experimental <span  title="" class="an ">&ensp;</span>and <span  title="" class="an ">&ensp;</span>theoretical <span  title="" class="an ">&ensp;</span>data <span  title="" class="an ">&ensp;</span>provide <span  title="" class="an ">&ensp;</span>a <span  title="" class="an ">&