Effect of liquid properties on electrosprays from externally wetted ionic liquid ion sources

  • Castro S
  • Larriba C
  • De La Mora J
 et al. 
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Ionic liquid ion sources ILISs are externally wetted and electrochemically etched and sharpened tungsten tips used as electrospraying sources for ionic liquids in a vacuum. They have recently shown an ability to operate as emitters of pure ion beams no drops, even with ionic liquids of moderate surface tension 40 dyn/cm and electrical conductivity K1 S/m that had in all prior reports all based on conventional internally fed capillary tips always operated in the mixed ion-drop regime. The present study uses time of flight mass spectrometry to analyze full ion beams emitted from ILISs for a diversity of ionic liquids with properties in the wide range 0.26 K S/m2.8, 39.3dyn/cm48.6. Remarkably, all liquids tested achieve the purely ionic regime. The main effect of reducing electrical conductivity is a reduction of the emission current from 180 to 10 nA

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  • S. Castro

  • C. Larriba

  • J. Fernandez De La Mora

  • P. Lozano

  • S. Sümer

  • Y. Yoshida

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