Plume particle energy analysis of an ionic liquid electrospray ion source with high emission density
Plume particle energy analysis of an ionic liquid electrospray ion source with high emission density
A retarding potential analyzer was used to characterize the energy distribution of the plume particles from an electrospray source. The electrospray device uses an ionic liquid, operates at bipolar and relatively high voltages from ± 1800 to ± 3500 V, and demonstrated ionic emissions with a relatively high emission density of more than ± 30 μ A per emission tip. Electrostatic simulations were used to study the effects of electric field distortion near the grids in the retarding potential analyzer, and a correction factor of 93% was used to regulate the deceleration voltage in the energy analysis, from which the voltage losses between the applied voltage of the electrospray source and the actual acceleration voltage of the charged particles were calculated, demonstrating non-kinetic efficiency from 85.8% at - 2100 V to 79.6% at 2600 V. The plume particle energy analysis shows evidence of fragmentation of heavier particles, mostly from dimer ions to monomer ions, and the detailed energy analysis was used to estimate the position where the fragmentation occurs. The results suggest that about 45%-55% of the particle fragmentation occurred in the field-free region and 20%-30% occurred in the acceleration region with an intense electric field, with the rest of the plume containing unfragmented ions.
Ma, Chengyu
284a62a1-e01b-4a2a-90ab-432306ef4952
Ryan, Charles
3627e47b-01b8-4ddb-b248-4243aad1f872
28 February 2021
Ma, Chengyu
284a62a1-e01b-4a2a-90ab-432306ef4952
Ryan, Charles
3627e47b-01b8-4ddb-b248-4243aad1f872
Ma, Chengyu and Ryan, Charles
(2021)
Plume particle energy analysis of an ionic liquid electrospray ion source with high emission density.
Journal of Applied Physics, 129 (8), [0035889].
(doi:10.1063/5.0035889).
Abstract
A retarding potential analyzer was used to characterize the energy distribution of the plume particles from an electrospray source. The electrospray device uses an ionic liquid, operates at bipolar and relatively high voltages from ± 1800 to ± 3500 V, and demonstrated ionic emissions with a relatively high emission density of more than ± 30 μ A per emission tip. Electrostatic simulations were used to study the effects of electric field distortion near the grids in the retarding potential analyzer, and a correction factor of 93% was used to regulate the deceleration voltage in the energy analysis, from which the voltage losses between the applied voltage of the electrospray source and the actual acceleration voltage of the charged particles were calculated, demonstrating non-kinetic efficiency from 85.8% at - 2100 V to 79.6% at 2600 V. The plume particle energy analysis shows evidence of fragmentation of heavier particles, mostly from dimer ions to monomer ions, and the detailed energy analysis was used to estimate the position where the fragmentation occurs. The results suggest that about 45%-55% of the particle fragmentation occurred in the field-free region and 20%-30% occurred in the acceleration region with an intense electric field, with the rest of the plume containing unfragmented ions.
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RPA paper_revised
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e-pub ahead of print date: 22 February 2021
Published date: 28 February 2021
Additional Information:
Funding Information:
The work has been supported by the Royal Society Grant with Grant No. RG150794, the UK Space Agency NSTP Pathfinder Grant under Grant No. NSTP3-PF2-064, the Engineering and Physical Sciences Research Council under Grant No. EP/M508147/1, and the University of Southampton under the funding codes of F2ZEM4, F27K05, F26QTE, and F22NS5.
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© 2021 Author(s).
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Copyright 2021 Elsevier B.V., All rights reserved.
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Local EPrints ID: 448026
URI: http://eprints.soton.ac.uk/id/eprint/448026
ISSN: 0021-8979
PURE UUID: e12f83b9-b8e0-448b-9bb3-5db8e12962cb
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Date deposited: 30 Mar 2021 16:34
Last modified: 16 Mar 2024 11:48
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Chengyu Ma
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