Coulomb crystal mass spectrometry in a digital ion trap

N Deb; LL Pollum; AD Smith; M Keller; CJ Rennick; BR Heazlewood; TP Softley

doi:10.1103/PhysRevA.91.033408

Coulomb crystal mass spectrometry in a digital ion trap

N Deb, LL Pollum, AD Smith, M Keller, CJ Rennick, BR Heazlewood, TP Softley

Research output: Contribution to journal › Article › peer-review

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Abstract

We present a mass spectrometric technique for identifying the masses and relative abundances of Coulomb-crystallized ions held in a linear Paul trap. A digital radio-frequency wave form is employed to generate the trapping potential, as this can be cleanly switched off, and static dipolar fields are subsequently applied to the trap electrodes for ion ejection. Close to 100% detection efficiency is demonstrated for Ca+ and CaF+ ions from bicomponent Ca+−CaF+ Coulomb crystals prepared by the reaction of Ca+ with CH3F. A quantitative linear relationship is observed between ion number and the corresponding integrated time-of-flight (TOF) peak, independent of the ionic species. The technique is applicable to a diverse range of multicomponent Coulomb crystals—demonstrated here for Ca+−NH3+−NH4+ and Ca+−CaOH+−CaOD+ crystals—and will facilitate the measurement of ion-molecule reaction rates and branching ratios in complicated reaction systems.

Original language	English
Article number	033408
Journal	Physical Review A - Atomic, Molecular, and Optical Physics
Volume	91
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevA.91.033408
Publication status	Published - 24 Mar 2015

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title = "Coulomb crystal mass spectrometry in a digital ion trap",

abstract = "We present a mass spectrometric technique for identifying the masses and relative abundances of Coulomb-crystallized ions held in a linear Paul trap. A digital radio-frequency wave form is employed to generate the trapping potential, as this can be cleanly switched off, and static dipolar fields are subsequently applied to the trap electrodes for ion ejection. Close to 100% detection efficiency is demonstrated for Ca+ and CaF+ ions from bicomponent Ca+−CaF+ Coulomb crystals prepared by the reaction of Ca+ with CH3F. A quantitative linear relationship is observed between ion number and the corresponding integrated time-of-flight (TOF) peak, independent of the ionic species. The technique is applicable to a diverse range of multicomponent Coulomb crystals—demonstrated here for Ca+−NH3+−NH4+ and Ca+−CaOH+−CaOD+ crystals—and will facilitate the measurement of ion-molecule reaction rates and branching ratios in complicated reaction systems.",

author = "N Deb and LL Pollum and AD Smith and M Keller and CJ Rennick and BR Heazlewood and TP Softley",

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doi = "10.1103/PhysRevA.91.033408",

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T1 - Coulomb crystal mass spectrometry in a digital ion trap

AU - Deb, N

AU - Pollum, LL

AU - Smith, AD

AU - Keller, M

AU - Rennick, CJ

AU - Heazlewood, BR

AU - Softley, TP

PY - 2015/3/24

Y1 - 2015/3/24

N2 - We present a mass spectrometric technique for identifying the masses and relative abundances of Coulomb-crystallized ions held in a linear Paul trap. A digital radio-frequency wave form is employed to generate the trapping potential, as this can be cleanly switched off, and static dipolar fields are subsequently applied to the trap electrodes for ion ejection. Close to 100% detection efficiency is demonstrated for Ca+ and CaF+ ions from bicomponent Ca+−CaF+ Coulomb crystals prepared by the reaction of Ca+ with CH3F. A quantitative linear relationship is observed between ion number and the corresponding integrated time-of-flight (TOF) peak, independent of the ionic species. The technique is applicable to a diverse range of multicomponent Coulomb crystals—demonstrated here for Ca+−NH3+−NH4+ and Ca+−CaOH+−CaOD+ crystals—and will facilitate the measurement of ion-molecule reaction rates and branching ratios in complicated reaction systems.

AB - We present a mass spectrometric technique for identifying the masses and relative abundances of Coulomb-crystallized ions held in a linear Paul trap. A digital radio-frequency wave form is employed to generate the trapping potential, as this can be cleanly switched off, and static dipolar fields are subsequently applied to the trap electrodes for ion ejection. Close to 100% detection efficiency is demonstrated for Ca+ and CaF+ ions from bicomponent Ca+−CaF+ Coulomb crystals prepared by the reaction of Ca+ with CH3F. A quantitative linear relationship is observed between ion number and the corresponding integrated time-of-flight (TOF) peak, independent of the ionic species. The technique is applicable to a diverse range of multicomponent Coulomb crystals—demonstrated here for Ca+−NH3+−NH4+ and Ca+−CaOH+−CaOD+ crystals—and will facilitate the measurement of ion-molecule reaction rates and branching ratios in complicated reaction systems.

U2 - 10.1103/PhysRevA.91.033408

DO - 10.1103/PhysRevA.91.033408

M3 - Article

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VL - 91

JO - Physical Review A - Atomic, Molecular, and Optical Physics

JF - Physical Review A - Atomic, Molecular, and Optical Physics

IS - 3

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ER -

Coulomb crystal mass spectrometry in a digital ion trap

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