Development and characterization of an iodine field emission ion source for FIB applications
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Author(s)
Fedkiw, Timothy Peter
Lozano, Paulo C.
Alternative Title
Development and characterization of an iodine field emission ion source for focused ion beam applications
Date Issued
November 2009
Journal
Journal of Vacuum Science and Technology B
Publisher
American Vacuum Society
Citation
Fedkiw, Timothy P., and Paulo C. Lozano. “Development and characterization of an iodine field emission ion source for focused ion beam applications.” J. Vac. Sci. Technol. B. AVS, 2009. 2648-2653.
Version
Author's final manuscript
Abstract
Emission of positive and negative ions is possible when a room temperature molten salt,
or ionic liquid, is exposed to a sufficiently high electric field. Ionic liquid ion sources
(ILIS) have shown potential to be used in various focused ion beam (FIB) applications,
since their operation and characteristics are similar to those of liquid metal ion sources,
with the advantage that ILIS work at low temperatures in comparison and a large number
of ionic liquids with many different compositions are available. In this paper we present
results on the emission characteristics of negative ions extracted from an iodine-based
ionic liquid using a time-of-flight mass spectrometer and a retarding potential analyzer.
The ionic liquid BMI-I is used as source media, producing a droplet free beam with
multiple solvated ion species. Attention is given to BMI-I in particular due to the
potential of creating a beam of pure and clustered I- ions, which are expected to improve
the performance in applications based on secondary emission and reactive species.
Properties important to the focusing of the ion beam such as mass and energy
distributions are obtained. Effects on the ion emission are studied through a comparison
of the source using temperature as a parameter to modify the liquid viscosity and
electrical conductivity.
MIT Department
Massachusetts Institute of Technology. Department of Aeronautics and Astronautics
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DOI of Published Version
https://doi.org/10.1116/1.3253604
