Space focusing extensively spread ions in time-of-flight mass spectrometry by nonlinear ion acceleration

Research output: Contribution to journalArticle

Abstract

A Wiley–McLaren-type time-of-flight mass spectrometer is improved for ions spatially spread over the ion-extraction region. We examine the case where a continuous ion beam is introduced coaxially to the flight path. The mass resolution, M/ΔM, is degraded because the ions are extensively spread along the flight path, when a conventional linear electric field is applied to the extraction region. It is pointed out that this is mainly due to the fact that the ions initially located near the exit of the extraction region arrive much earlier than the others as revealed by flight-time simulation. The simulation further identifies an ‘ideal’ nonlinear electric field, which compensates for the flight-time difference and thus maximizes the mass resolution. We demonstrate that such a nonlinear electric field close to the ‘ideal’ one is materialized by simply removing a grid mesh from the exit electrode of the extraction region, which results in significant improvement in the mass resolution.

Original languageEnglish
Pages (from-to)65-69
Number of pages5
JournalInternational Journal of Mass Spectrometry
Volume414
DOIs
Publication statusPublished - Mar 1 2017

Fingerprint

Mass spectrometry
flight time
flight paths
mass spectroscopy
Ions
Flight paths
electric fields
Electric fields
ion extraction
ions
mass spectrometers
mesh
Mass spectrometers
simulation
ion beams
grids
Ion beams
electrodes
Electrodes

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry

Cite this

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title = "Space focusing extensively spread ions in time-of-flight mass spectrometry by nonlinear ion acceleration",
abstract = "A Wiley–McLaren-type time-of-flight mass spectrometer is improved for ions spatially spread over the ion-extraction region. We examine the case where a continuous ion beam is introduced coaxially to the flight path. The mass resolution, M/ΔM, is degraded because the ions are extensively spread along the flight path, when a conventional linear electric field is applied to the extraction region. It is pointed out that this is mainly due to the fact that the ions initially located near the exit of the extraction region arrive much earlier than the others as revealed by flight-time simulation. The simulation further identifies an ‘ideal’ nonlinear electric field, which compensates for the flight-time difference and thus maximizes the mass resolution. We demonstrate that such a nonlinear electric field close to the ‘ideal’ one is materialized by simply removing a grid mesh from the exit electrode of the extraction region, which results in significant improvement in the mass resolution.",
author = "Shun Sarugaku and Masashi Arakawa and Akira Terasaki",
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AU - Sarugaku, Shun

AU - Arakawa, Masashi

AU - Terasaki, Akira

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N2 - A Wiley–McLaren-type time-of-flight mass spectrometer is improved for ions spatially spread over the ion-extraction region. We examine the case where a continuous ion beam is introduced coaxially to the flight path. The mass resolution, M/ΔM, is degraded because the ions are extensively spread along the flight path, when a conventional linear electric field is applied to the extraction region. It is pointed out that this is mainly due to the fact that the ions initially located near the exit of the extraction region arrive much earlier than the others as revealed by flight-time simulation. The simulation further identifies an ‘ideal’ nonlinear electric field, which compensates for the flight-time difference and thus maximizes the mass resolution. We demonstrate that such a nonlinear electric field close to the ‘ideal’ one is materialized by simply removing a grid mesh from the exit electrode of the extraction region, which results in significant improvement in the mass resolution.

AB - A Wiley–McLaren-type time-of-flight mass spectrometer is improved for ions spatially spread over the ion-extraction region. We examine the case where a continuous ion beam is introduced coaxially to the flight path. The mass resolution, M/ΔM, is degraded because the ions are extensively spread along the flight path, when a conventional linear electric field is applied to the extraction region. It is pointed out that this is mainly due to the fact that the ions initially located near the exit of the extraction region arrive much earlier than the others as revealed by flight-time simulation. The simulation further identifies an ‘ideal’ nonlinear electric field, which compensates for the flight-time difference and thus maximizes the mass resolution. We demonstrate that such a nonlinear electric field close to the ‘ideal’ one is materialized by simply removing a grid mesh from the exit electrode of the extraction region, which results in significant improvement in the mass resolution.

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