利用同步辐射光和反射飞行时间质谱,研究了丙烯酸甲酯9.0~15.5eV能量范围的真空紫外光电离和光解离.实验测量丙烯酸甲酯的光电离质谱和解离碎片离子m/e=86(C4H6O2^+),85(C4H5O2^+),59(C2H3O2^+),58(C3H6O^+),55(C3H3O^+),42(C3H6^+),31(CH3O^+),27(C2H3^+),和15(CH3^+)的光电离效率曲线.并利用量子化学从头算(G3),计算碎片离子的能级,推测它们的解离通道.计算的电离能和出现势与实验结果符合很好.结果表明,丙烯酸甲酯的光电离解离通道以单键断裂反应为主.
The vacuum uhraviolet (VUV) photoionization and dissociative photoionization of methyl acrylate have been studied at the photon energy range of 9.0 - 15.5 eV by using synchrotron radiation and a reflection time-of-flight mass spectrometer (TOF-MS). The photoionization mass spectra and photoionization efficiency ( PIE ) curves for fragment ions m/e=86(C4H6O2^+),85(C4H5O2^+),59(C2H3O2^+),58(C3H6O^+),55(C3H3O^+),42(C3H6^+),31(CH3O^+),27(C2H3^+),and 15(CH3^+) from methyl acrylate have been measured. In addition, the energeties of the dissociative photoionization species have been calculated using ab initio Gaussian-3 (G3) programs. The calculated ionization energies (IEs) and appearance energies (AEs) are in good agreement with the experimental data. Moreover, the main dissociative photoionization channels, simple bond cleavage reactions, are proposed