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Non‐vacuum field desorption ion source implemented under super‐atmospheric pressure
Author(s) -
Chen Lee Chuin,
Rahman Md. Matiur,
Hiraoka Kenzo
Publication year - 2012
Publication title -
journal of mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 1076-5174
DOI - 10.1002/jms.3062
Subject(s) - chemistry , common emitter , field desorption , atmospheric pressure , analytical chemistry (journal) , ultra high vacuum , tungsten , ion source , ion , desorption , mass spectrometry , electric field , ionization , atomic physics , optoelectronics , nanotechnology , materials science , chromatography , oceanography , physics , organic chemistry , adsorption , quantum mechanics , geology
Standard field desorption (FD) ionization is implemented under high vacuum condition. In this paper, non‐vacuum FD is performed under a super‐atmospheric pressure environment using untreated tungsten wires as FD emitter, and the ion source was coupled to a commercial linear ion trap mass spectrometer. The operating pressure of the ion source was 6 bars which was high enough to provide sufficient dielectric strength to the working gas so that the high voltage that was required for FD could be applied to the emitter without occurrence of electrical discharge. Non‐volatile sample deposited on the bare tungsten wire FD emitter was heated by flowing direct current through the emitter. Similar to vacuum FD, the formation of conical protrusion of the liquefied sample layer under the strong electric field was also observed. Using the present ion source, high pressure field‐desorption of polar neutral compounds, organic salts and ionic liquids is demonstrated. Copyright © 2012 John Wiley & Sons, Ltd.