Abstract
The reasons why sonic spray ionization can readily produce multiply-charged ions when a high voltage is applied to the source housing have been investigated by using aerosol techniques. Charged droplets were produced by sonic spray from a trifluoroacetic acid solution in triethylene glycol/ethanol. These droplets were analyzed with a differential mobility analyzer to obtain their mobilities, and also analyzed with an aerodynamic particle size spectrometer to obtain their diameters. By combining these results, the charge numbers of the droplets have been determined. The results show that some droplets have charge numbers close to the Rayleigh limit and that the abundance of these droplets increases as the voltage applied to the source housing increases. A qualitative explanation is given for the formation of multiply-charged ions.
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