ionization chamber
... that in the ionization chamber of a smoke detector, ions strike smoke particles and are neutralized, and this drop in current triggers the alarm?
... that in the <b id="mwAkQ"><a href="./Ionization_chamber" id="mwAkU" rel="mw:WikiLink" title="Ionization chamber">ionization chamber</a></b> of a <a href="./Smoke_detector" id="mwAkY" rel="mw:WikiLink" title="Smoke detector">smoke detector</a>, ions strike <a href="./Smoke" id="mwAkc" rel="mw:WikiLink" title="Smoke">smoke</a> particles and are neutralized, and this drop in <a class="mw-redirect" href="./Electrical_current" id="mwAkg" rel="mw:WikiLink" title="Electrical current">current</a> triggers the <a class="mw-redirect" href="./Burglar_alarm" id="mwAkk" rel="mw:WikiLink" title="Burglar alarm">alarm</a>?