Abstract:

Using 355 nm laser as excitation source,m-methylphenol multiphoton ionization and disso- ciation(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.

Key words: spectroscopy, multiphoton ionization, time-of-flight mass spectra, ab initio calculation, m-methylphenol