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在(zai)自然狀態下，空(kong)(kong)(kong)氣分子(zi)(zi)(zi)(zi)的極性(xing)呈中(zhong)性(xing)，即不帶電荷。但(dan)在(zai)紫外(wai)線(xian)、輻射、雷擊(ji)閃電等作用下，空(kong)(kong)(kong)氣分子(zi)(zi)(zi)(zi)會失(shi)去(qu)一部分圍(wei)繞原子(zi)(zi)(zi)(zi)核旋轉的外(wai)層(ceng)電子(zi)(zi)(zi)(zi)，使空(kong)(kong)(kong)氣發(fa)生電離。逃逸(yi)原子(zi)(zi)(zi)(zi)核束縛(fu)的電子(zi)(zi)(zi)(zi)稱為自由電子(zi)(zi)(zi)(zi)，帶負電荷。當自由電子(zi)(zi)(zi)(zi)與其它(ta)中(zhong)性(xing)氣體(ti)分子(zi)(zi)(zi)(zi)結合后，就形成帶負電荷的空(kong)(kong)(kong)氣負離子(zi)(zi)(zi)(zi)。負離子(zi)(zi)(zi)(zi)濃(nong)度檢測

更新(xin)時間：2022-08-03