Abstract
At about the minimum flow rate, mono-disperse charged droplets have been produced by electrospray from an aqueous solution of trifluoroacetic acid. Charged droplets and ions formed from the droplets were passed through a heated copper tube and then analyzed with a differential mobility analyzer. In the mobility spectra it was found that with increasing temperature the current of the charged droplet peak at 3.75 × 10 −5m 2 V −1 s −1 decreases and finally disappears, while that of the ion peak at 7.20 × 10 −5m 2 V −1 s −1 decreases much less. This result shows that ions are formed from heated droplets. The electric field at the droplet surface was determined as (1.32 ± 0.09) × 10 9V m −1.
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