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Poster Presentations
Day 4, June 25（Wed.）
Room P (Maesato East, Foyer, Ocean Wing)
- 4P-PM-08
Study of Negative Differential Resistance and Ion Emission Characteristics from a Taylor Cone of Undiluted Ionic Liquid Using High-Pressure ESI
(Univ. Yamanashi)
oLee Chuin Chen, Takeshi Matsuda
A HP-ESI system is used to study the characteristics of the spray current, flow rate, effect of ambient gas pressure, and the generated ion species from the Taylor cone of an undiluted ionic liquid (1-ethyl-3-methylimidazolium tetrafluoroborate, Emim-BF4). A wide dynamic range of flow rate Q from <0.1 nL/min to ~40 nL/min is attained by modulating the emitter voltage V with the monitoring of spray current I. The I-V measurement reveals a pressure dependence characteristic and an intriguing negative differential resistance in the region between the high and low flow rate regimes. In the region of low voltage, the generated ion beam is highly collimated and the intensity for all ion species reached its maximum at a spray current slightly above the minimum current, suggesting that ion evaporation from the tip of the Taylor cone may account for all detected ion species including the high-order clusters at low flow rate.