Comparative analyses show that the electron impact excitated to repulsive state will play a dominant role in the process, the cross section of which is about one order of magnitude larger than others.

• 通过比较表明到排斥态的激发然后发生解离反应的反应截面占据主导地位，比激发到其它三重态激发然后发生解离的反应截面要大一个量级。