利用355nm激光作为光源对间甲苯酚分子进行了多光子电离解离研究，得到了间甲苯酚分子的多光子电离飞行时间质谱图，实验中没有观测到母体离子信号。对其中的部分产物离子进行分析，得出了该波长下主要的解离电离通道。应用从头计算理论，在B3LYP／6－311++G(d，p)基组水平上对质荷比为109(C₇H₈OH⁺)离子及C₇H₈O的可能构型进行优化，得到了其稳定构型。对C₇H₈OH⁺离子势能面的研究得到，C₇H₈OH⁺离子的形成是一个无势垒的反应过程。

Using 355 nm laser as excitation source,m-methylphenol multiphoton ionization and dissociation(MPID)was studied,m-methylphenol time-of-flight mass spectra of multiphoton ionization were obtained,There is no parent ion detected. The main possible dissociation and ionization channels were analysed. Using ab initio calculation to optimize the geometric structures of C₇H₈OH⁺ and C₇H₈OH at B3LYP/6-311++G(d,p)level,the stable structures are obtained. By exploring the potential energy surface of C₇H₈OH⁺,that the formation of C₇H₈OH⁺ is a reaction process without potential barrier is concluded.