Si(CH_3)_4分子的多光子电离和解离研究

A Multiphoton lonization Time--of--Flight Mass Spectra of Si(CH_3)_4

对Si(CH_3)_4分子在280.0nm波长的激光多光电子电离和解高产物离子的飞行时间质谱进行了测定,结果表明:Si(CH_3)_4分子解离和电离后的主要正离子产物为:Si(CH_3)_2^+、Si^+和CH_x^+(x=0,1,2,3)离子等。本文还讨论了不同激光功率下Si(CH_3)_4分子产生不同碎片产物离子的机理。

The multiphoton ionization mass spectrum of Si(CH_3)_4 molecule has been inve-stigated for laser wavelength 280nm using a pulse molecular beam and time--of-flight mass spectromer techniques. Several ion peaks assigned to Si(CH_3)_2^+,Si^+, CH_x^+(x = 0, 1, 2, 3,)and C_2H_y^+(y = 0, 1, 2,...)are observed from this study.The multiphoton ionization and dissociation processes of Si(CH_3)_4 at 280nm areproposed based on the results.