以掺有稠环芳烃的碳化硅为样品．在自制的仪器上通过激光溅射．产生了碳与硅的二元原子簇离子及由它们再结合一个氢原子的簇离子．从实验记录的正负离子的飞行时间质谱发现，这些族离子的相对信号强度具有奇偶交替变化的规律，并由此探讨了它们的价键结构． A sample doped with polycyclic aromatic hydrocarbons of silicon carbide. Sputtered by laser on homemade instruments. Binary cluster ions of carbon and silicon and cluster ions from which one hydrogen atom is recombined are produced. From the experimentally recorded time-of-flight mass spectra of positive and negative ions, we found that the relative signal intensities of these groups of ions have the regularity of odd and even alternations, and their valence bond structures are discussed.