Ion beam generation from an electrolyte solution containing polyatomic cations and anions for secondary ion mass spectrometry

Yukio Fujiwara, Kouji Watanabe, Naoaki Saito, Hidehiko Nonaka, Atsushi Suzuki, Taisuke Nakanaga, Toshiyuki Fujimoto, Akira Kurokawa, Shingo Ichimura, Mitsuhiro Tomita

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8 Citations (Scopus)

Abstract

A solution-type ion beam source was fabricated to utilize polyatomic anions as well as polyatomic cations that are stable in solutions. The ion source consists of an electrospray section at atmospheric pressure and a vacuum section with a differential pumping system. To demonstrate the beam generation of cations or anions, ethanol solution containing a room-temperature molten salt (i.e., an ionic liquid) was tested. The ionic liquid, N, N-diethyl-N-methyl-N- (2-methoxyethyl)ammonium bis(trifluoromethanesulfonyl)imide, consists of a polyatomic cation, [C8H20ON]+, and a polyatomic anion, [CFNOS]+. Ions produced at atmospheric pressure were passed through an aperture into a vacuum chamber and then transported to a target. The effects of the aperture dimensions were investigated in the range from 50 to 200 mm in diameter and 0.25 to 1mm in thickness. The ratio of current passing through the aperture into the vacuum chamber to the total electrosprayed current was on the order of 10-3 to 10-5. The ratio increased with increasing aperture diameter. A reduction in the aperture thickness also improved the ratio. Beam current increased with applied voltage in both positive-ion and negative-ion modes. It was demonstrated that stable negative-ion beams as well as positive-ion beams on the order of pA were produced.

Original languageEnglish
Article number126005
JournalJapanese journal of applied physics
Volume48
Issue number12
DOIs
Publication statusPublished - 2009 Dec 1
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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    Fujiwara, Y., Watanabe, K., Saito, N., Nonaka, H., Suzuki, A., Nakanaga, T., Fujimoto, T., Kurokawa, A., Ichimura, S., & Tomita, M. (2009). Ion beam generation from an electrolyte solution containing polyatomic cations and anions for secondary ion mass spectrometry. Japanese journal of applied physics, 48(12), [126005]. https://doi.org/10.1143/JJAP.48.126005