It is found that no parent ions of acetone are produced, but only the frag ment ions at m/e=15 and 43, corresponding to two neutral fragments of CH_3 and CH_3CO generated by photodissociation of acetone, respectively.

• 实验表明丙酮没有产生母体离子峰(m/e=58),只给出m/e=43和15两个峰,分别对应于丙酮光解所产生的两个碎片CH_3 CO和CH_3。