On one hand, many C,N-containing neutral species such as C2N2, CH3CN, HC3N, CCN, etc. can effectively produce the C2N+ ion upon electron impact and radiation.

• 一方面，很多含有C,N原子的中性分子如C2N2、CH3CN、HC3N、CCN等经电子撞击电离或辐射后能很有效的电离出C2N+离子；