Journal
ANALYTICAL CHEMISTRY
Volume 78, Issue 8, Pages 2658-2664Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac0520036
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New modes of nanoelectrospray (nES) have been identified that exhibit stable high-frequency current oscillations in the kilohertz range. In-line flow rate measurements during nES have for the first time allowed the accurate determination of the spray current and volumetric flow rate dependence on applied voltage. High-speed video imaging has revealed that each current pulse corresponds to the periodic formation of a short-lived stable cone-jet structure at the capillary tip. These findings are of particular importance and suggest greater process monitoring and control in nES-MS systems is necessary if efficiency and ion yield are to be optimized.
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