Emission characteristics of a charged-droplet beam source using vacuum electrospray of an ionic liquid

Yukio Fujiwara; Naoaki Saito; Hidehiko Nonaka; Shingo Ichimura

doi:10.1002/sia.5071

Emission characteristics of a charged-droplet beam source using vacuum electrospray of an ionic liquid

Yukio Fujiwara, Naoaki Saito, Hidehiko Nonaka, Shingo Ichimura

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

To develop an ion source capable of producing a charged-droplet beam at higher current density with a smaller beam spot size, beam characteristics of electrosprayed charged particles were investigated. A quaternary ammonium ionic liquid, N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium bis(trifluoromethanesulfonyl) amide (DEME-TFSA), was tested in vacuum around 10^-5 Pa. A hysteresis behavior in the electrosprayed current was observed when the capillary voltage was changed. The m/z values of generated charged droplets decreased with decreasing flow rate and increasing capillary voltage and temperature. Average masses and charge numbers of the charged droplets as well as projectile energy per nucleon were estimated on the basis of the experimental results.

Original language	English
Pages (from-to)	517-521
Number of pages	5
Journal	Surface and Interface Analysis
Volume	45
Issue number	1
DOIs	https://doi.org/10.1002/sia.5071
Publication status	Published - 2013 Jan
Externally published	Yes

Keywords

SIMS
charged droplet
electrospray
ion source
ionic liquid

ASJC Scopus subject areas

Chemistry(all)
Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

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10.1002/sia.5071

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AU - Ichimura, Shingo

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AB - To develop an ion source capable of producing a charged-droplet beam at higher current density with a smaller beam spot size, beam characteristics of electrosprayed charged particles were investigated. A quaternary ammonium ionic liquid, N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium bis(trifluoromethanesulfonyl) amide (DEME-TFSA), was tested in vacuum around 10-5 Pa. A hysteresis behavior in the electrosprayed current was observed when the capillary voltage was changed. The m/z values of generated charged droplets decreased with decreasing flow rate and increasing capillary voltage and temperature. Average masses and charge numbers of the charged droplets as well as projectile energy per nucleon were estimated on the basis of the experimental results.

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