最近,我们在自制的仪器上,以脉冲激光(波长582nm,能量密度10~8W/cm~2)在10~(-4)Pa的真空中溅射合适的样品,产生了一系列C_nH~-、C_nF~和C_nF_3~-记录了它们的飞行时间质谱. 图1所示的负离子质谱由激光作用苯并菲产生,样品为分析纯,实验时压紧成片.图中可以观察到各种大小的裸碳原子簇负离子C_nH~-但是当它们再结合1个氢原子成为C_nH~后,却只有n为偶数的负离子才能稳定存在.以其他芳香烃为样品,也都能得到相同的结果.以往 Recently, we pulsed the appropriate sample with a pulsed laser (wavelength 582nm, energy density 10 ~ 8W / cm ~ 2) in a vacuum of 10 ~ (-4) Pa on a homemade instrument to produce a series of C_nH ~ , C_nF ~ and C_nF_3 ~ - recorded their time-of-flight mass spectrometry. The negative ion mass spectrum shown in Figure 1 is generated by the laser action of benzophenanthrene, the sample is of analytical grade and is compact into pieces during the experiment. Of the bare carbon cluster anion C_nH ~ - but when they are combined with a hydrogen atom to become C_nH ~, but only an even number of negative ions can be stably present.With other aromatic samples as samples, can get the same results in the past