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Evaluation of a diode laser‐assisted vacuum‐type charged droplet beam source
Author(s) -
Ninomiya Satoshi,
Chen Lee Chuin,
Sakai Yuji,
Hiraoka Kenzo
Publication year - 2014
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.5532
Subject(s) - electrospray , laser , common emitter , aqueous solution , chemistry , diode , wavelength , infrared , analytical chemistry (journal) , optics , optoelectronics , materials science , mass spectrometry , chromatography , physics
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) CO 2 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.