Evaluation of a diode laser-assisted vacuum-type charged droplet beam source

Authors

  • Satoshi Ninomiya,

    Corresponding author
    1. Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Kofu, Yamanashi, Japan
    • Correspondence to: S. Ninomiya, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi, 400-8511, Japan.

      E-mail: sninomiya@yamanashi.ac.jp

      Kenzo Hiraoka, Clean Energy Research Center, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi, 400-8511, Japan.

      E-mail: hiraoka@yamanashi.ac.jp

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  • Lee Chuin Chen,

    1. Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Kofu, Yamanashi, Japan
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  • Yuji Sakai,

    1. Clean Energy Research Center, University of Yamanashi, Kofu, Yamanashi, Japan
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  • Kenzo Hiraoka

    Corresponding author
    1. Clean Energy Research Center, University of Yamanashi, Kofu, Yamanashi, Japan
    • Correspondence to: S. Ninomiya, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi, 400-8511, Japan.

      E-mail: sninomiya@yamanashi.ac.jp

      Kenzo Hiraoka, Clean Energy Research Center, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi, 400-8511, Japan.

      E-mail: hiraoka@yamanashi.ac.jp

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Abstract

The electrospray droplet impact (EDI) method based on ambient electrospray technique was developed as a novel massive cluster beam gun, but in its current status, the EDI method lacks adequate beam focusing and brightness. To improve the performance of the current EDI method, we developed a technique for producing electrospray of aqueous solutions under vacuum. In a previous study, the tip of the electrospray emitter was irradiated with an infrared (IR) CO2 laser (wavelength: 10.6 µm) to prevent freezing of the aqueous solutions. In this paper, a near-IR diode laser (wavelength: 808 nm) was adopted for heating the tip of the electrospray emitter as an alternative to the IR laser. A stable vacuum electrospray of aqueous solutions was obtained, whereas the 808 nm light was poorly absorbed by water compared with the 10.6-µm IR laser. The characteristics of the vacuum electrospray assisted by a near-IR laser are presented. Copyright © 2014 John Wiley & Sons, Ltd.

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