Abstract
The electrohydrodynamic disintegration of sample droplets deposited onto 10-μm tungsten wire emitters has been studied under conditions of field desorption mass spectrometry, by optical microscopy. In these experiments droplets were taken from concentrated aqueous solutions of sucrose and polyethylene oxide, both containing alkali salts, and of tartaric acid. Various stages of disintegration of the samples are distinguished. The final and almost stationary state of the samples corresponding to the best anode temperature for the emission of quasimolecular ions is also displayed. The emission of desolvated ions is attributed to the formation of very fine tips and fibers projecting out of the sample layer. The threshold field strength required to initiate the observed electrohydrodynamic effects resulting in the final ion-emitting state of the sample is estimated to be of the order of 10 8 V m −1.
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