ESI current oscillations for high resistivity fluid with simultaneous visualization of the Taylor cone
T12N4
N.S. Fomina, S.V. Masyukevich, L.N. Gall, N.R. Gall
Low-frequency oscillations occurring in electrospray of liquid of low electric conductivity were studied. On the basis of spectral measurements of the oscillations in the range of voltages, typically used in mass spectrometry, it was shown that the spectrum reveals the control frequency, which accounts for ≈ 80 % of the power oscillations, and a set of overtones. The magnitude of the main frequency varies in the range of 200−800 Hz and increases with voltage up to breakdown. Immediately after the collapse of oscillation, the most stable mode of spraying is realized. A model describing the mechanism of occurrence of oscillation due to the role of the space charge accumulated on the counter-electrode was suggested.
