532nm及355nm丁酮多光子电离质谱研究  

Study of mass spectrum of multi-photon ionization of 2-butanone at 532 nm and 355 nm

作　　者：张良芳[1] 孔祥和[1] 孙志青[1] 刘建苹[1] 

机构地区：[1]曲阜师范大学物理工程学院,山东曲阜273165

出　　处：《物理实验》2007年第7期13-16,共4页Physics Experimentation

基　　金：曲阜师范大学科研启动基金资助

摘　　要：利用激光质谱法,采用355 nm及532 nm激光作为光源对丁酮分子进行了多光子电离解离研究,得到了2种波长下丁酮的多光子电离飞行时间质谱图主要有质荷比为1(H+),15(CH3+),43(CH3CO+)的质谱峰.532 nm质谱比较丰富,有较强的质荷比为45的信号,可以认为这是丁酮异构体电离解离得到的产物;同时探测到了质荷比为4,6,8的信号,可能是高价离子.355 nm质谱图相对简单.根据信号比例随激光能量的变化及主要的离子信号,得出了2种波长下主要的解离电离通道.By means of laser mass spectrometry, using 355 nm and 532 nm lasers as excitation sources, 2-butanone＇ s multi-photon ionization and dissociation （MPID） is studied. 2-butanone＇ s mass spectrums of multi-photon ionization （MPI） under both wavelengths are mainly the spectrum peaks that mass charge ratios equal to 1 （H^＋）,15 （CH3^＋） and 43 （CH3CO^＋）. Mass spectrum at 532 nm is relatively complicated, and the signal of 45 is quite strong. Meanwhile we have detected ions of mass charge ratios of 4, 6 and 8, which are probably multiply charged ions, but further research is needed. The mass spectrum at 355 nm is relatively simple. Finally we analyze the main possible dissociation and ionization channel at both wavelengths.

关 键 词：丁酮 多光子电离质谱 激光质谱法 

分 类 号：O561[理学—原子与分子物理] O657.63[理学—物理]