Ion density of positive and negative ions at ambient pressure in air at 12-136 mm from 4.9 kV soft x-ray source

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Anttalainen , O , Lattouf , E , Kotiaho , T & Eiceman , G 2021 , ' Ion density of positive and negative ions at ambient pressure in air at 12-136 mm from 4.9 kV soft x-ray source ' , Review of Scientific Instruments , vol. 92 , no. 5 , 054104 . https://doi.org/10.1063/5.0050669

Title: Ion density of positive and negative ions at ambient pressure in air at 12-136 mm from 4.9 kV soft x-ray source
Author: Anttalainen, Osmo; Lattouf, Elie; Kotiaho, Tapio; Eiceman, Gary
Contributor organization: Department of Chemistry
VERIFIN
Division of Pharmaceutical Chemistry and Technology
Drug Research Program
Tapio Kotiaho / Principal Investigator
Date: 2021-05-01
Language: eng
Number of pages: 10
Belongs to series: Review of Scientific Instruments
ISSN: 0034-6748
DOI: https://doi.org/10.1063/5.0050669
URI: http://hdl.handle.net/10138/334396
Abstract: The abundance of ions is an essential parameter for ion mobility and mass spectrometry instrument design and for the control or optimization of chemical reactions with reactant ions. This information also advances the study of atmospheric pressure ion kinetics under continuous ionization, which has a role in developing trace level chemical analyzers. In this study, an ionization chamber is described to measure the abundance of ions produced by a 4.9 keV, model L12535, soft x-ray source from Hamamatsu Corporation. Ions of positive and negative polarity were measured independently in an 8 x 30 mm(2) cross section at distances of 12-136 mm at ambient air from an uncollimated beam. Ions were collected using electric fields and 16 sets of plates. The ion current decreased exponentially with distance from the source, and the calculated ion concentration varied between 1.0 x 10(8) and 3.8 x 10(5) ions cm(-3) on plates. A 2D-COMSOL model including losses by recombination and diffusion was favorably matched to changes in ion current intensity in the ionization chamber. Although the ionization chamber was built to characterize a commercial ion source, the design may be considered generally applicable to other x-ray sources. (C) 2021 Author(s).
Subject: MOBILITY SPECTROMETRY
CHEMICAL-IONIZATION
116 Chemical sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


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