532nm丙酮和丁酮的多光子电离解离研究  

Studies on multi-photon ionization and dissociation of acetone and 2-butanon at 532 nm

作　　者：张良芳[1] 孔祥和[1] 孙志青[1] 张树东[1] 刘建苹[1] 

机构地区：[1]曲阜师范大学物理工程学院,曲阜273165

出　　处：《原子与分子物理学报》2008年第3期716-720,共5页Journal of Atomic and Molecular Physics

基　　金：曲阜师范大学科研启动基金

摘　　要：利用激光质谱法,通过分析丙酮和丁酮的多光子电离飞行时间质谱,对其532 nm多光子电离机制进行了研究.结果发现丙酮相干吸收若干光子跃迁到高能超激发态,再继续吸收光子产生各种碎片离子,而丁酮先解离后电离.两质谱中都有质荷比为4、6、8的离子,原则上是高价离子,但在相似条件下未见相关报道,因此对离子出险原因及确认尚待进一步研究.实验中丁酮发生异构现象,其异构体电离解离出较强的C2H3O+(m/e=43).丙酮没有相关离子产生.By laser mass spectroscopy, the MPI mechanisms of acetone and 2-butanone are studied at 532nm through analysis of their multiphoton ionization and time of fly mass spectrum （MPI-TOFMS）. It shows that acetone molecules absorb several photons coherently and transmit into super-excited states; then they go on absorbing photons and give birth to all ions. 2-butanone molecules dissociate firstly and ionize secondly. There are signals of ions （m/e=4 or 6 or 8）, and they should be multiply charged ions. But there is no correlative report under the same condition, so more studies are needed on the reason for the appearance of this phenomenon and the affirmation of these ions （m/e = 4,6,8）. During the experiment, 2-butanone＇ s isomers ionize and dissociate, and produce stronger C2H3O^＋ （m/e=43）, No correlative ions are found in acetone＇s mass spectrum.

关 键 词：MPI-TOFMS 激光质谱法 丙酮 丁酮 

分 类 号：O561[理学—原子与分子物理]