【摘要】 通过对气体SF₆及其碎片的激光辐照，发现在激光束不聚焦的条件下，在235～270nm只有SF₂^＋信号很强，并观测了在这一范围内SF₂^＋信号强度随波长的变化关系和波长固定在247.09nm处的SF₂^＋信号强度随激光强度变化的关系。通过对这些实验数据的分析，推测这一离子信号来自基态SF₂自由基的REMPI过程，SF₂^＋信号强度随波长的变化关系反映了SF₂自由基基态到某个待定电子态的共振跃迁。在此基础上，经过对235～270nm光谱的分析得到了这个电子态的v1振动模的振动频率ω₁＝926（4）cm^-1和可能的位置T₀＝38623cm^－1。如果这些分析和推测是正确的，T₀＝38623cm^－1电子态将是SF₂自由基的一个新电子态。根据已知SF₂自由基的各电子态能级的高低，暂时将这个电子态排序为SF₂自由基的B态。更多还原

【Abstract】 The SF₂⁺ signals were found prominment in the range of 235 ²70nm by radiating the SF₆ molchules and their fragments with unfocused laser. The fragmets of SF₆ moledes were produed in the dc discharge of the SF₆/Ar （1/10） mixture. The perturbation caused by the dc-discharge ions has been elminated successfully in the proass of probing REMPI ions, The condation between the magnitude of the SF₂⁺ signal and the wavelength of laser was observed in this range. The correation between the magnitude of the SF₂⁺ signal and the intensity of laser was obtained in the wavelength of 247.09n m. We estirnate that there probably is a new electronic state in the energy tange of 38623 ⁴2328 cm^-1 in the base of analysis of the experimental data. The vibronic frequency of v1 vibronic mode ω1=926 （4） cm^-1 and the probably band origin T₀=38623 cm^-1 are reported. The new state is temporailiy assigned to the B state of SF₂ radical in terms of its energy 1evel.更多还原