A study of the autoionization of the SF 6 - ion has been performed using the technique of ion cyclotron resonance (ICR). This study utilizes the motion of charged particles in the trapping plate plane to effectively separate the SF 6 - ion and electron currents, thus enabling the direct evaluation of the ion current signal as a function of time. The autoionization process was observed as a function of both the electron-neutral interaction time and the density of the neutral molecule. It was found that the 'apparent' autoionization lifetime, tau a , of SF 6 - varies as a function of observation time from 50 mu s to 10 ms. Estimates are also made of the effective collisional stabilization frequency of the SF 6 - *-SF 6 collision pair as well as the vibrational fluorescence lifetime of the excited ion.
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Odom et al. (1975) studied this question.
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