Quantitative detection of low energy positive and negative ions with a channel electron multiplier

Keller, C.; Cooper, B. H.

doi:10.1063/1.1147104

Cited by 8 publications

(4 citation statements)

References 15 publications

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“…The present measurements also agree favorably with absolute detection efficiencies measured for O Ϫ and O ϩ incident on two distinct channel electron multipliers by Keller and Cooper. 9 These results and the present ones indicate that D Ϫ ϾD ϩ for EϽ7500 eV. Carefully designed electrostatic shielding in the experiment by Keller and Cooper 9 ensured the exclusion of stray secondary electrons from enhancing the measured O Ϫ detection efficiency; it was thus concluded that the difference might be due to different secondary electron coefficients for O ϩ and O Ϫ impacting a CEM surface.…”

Section: Resultssupporting

confidence: 59%

“…There have been many attempts to characterize and predict their detection efficiencies for electrons 1,2 and ions. [2][3][4][5][6][7][8][9] Less well studied, however, is their detection efficiency for low energy neutral species. 10 This appears to be primarily due to the lack of facilities able to produce well-characterized, variable energy beams of neutral atoms or molecules.…”

Section: Introductionmentioning

confidence: 99%

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Absolute calibration of a multichannel plate detector for low energy O, O−, and O+

Stephen

Peko

2000

Review of Scientific Instruments

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Articles you may be interested inThomson spectrometer-microchannel plate assembly calibration for MeV-range positive and negative ions, and neutral atoms Rev. Sci. Instrum. 84, 053302 (2013); 10.1063/1.4803670Gamma-ray detection efficiency of the microchannel plate installed as an ion detector in the low energy particle instrument onboard the GEOTAIL satellite Rev. Sci. Instrum. 78, 034501 (2007);Absolute detection efficiencies of a commercial multichannel plate detector have been measured for O, O ϩ , and O Ϫ , impacting at normal incidence for energies ranging from 30-1000 eV. In addition, the detection efficiencies for O relative to its ions are presented, as they may have a more universal application. The absolute detection efficiencies are strongly energy dependent and significant differences are observed for the various charge states at lower energies. The detection efficiencies for the different charge states appear to converge at higher energies. The strongest energy dependence is for O ϩ ; the detection efficiency varies by three orders of magnitude across the energy range studied. The weakest dependence is for O Ϫ , which varies less than one order of magnitude.

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Section: Resultssupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Absolute calibration of a multichannel plate detector for low energy O, O−, and O+

Stephen

Peko

2000

Review of Scientific Instruments

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“…The absolute detection efficiency across the mass range of our instrument for the MgO-coated CEM is presently unknown. For the same CEM model but without MgO coating and similar ion energies, Keller and Cooper (1996) found the absolute detection efficiency for oxygen to be about 0.6 for positive ions and 0.7 for negative ions. Heavier atomic ions generally have a lower detection efficiency (Krems et al, 2005), e.g.…”

Section: Charge Balancementioning

confidence: 86%

“…Potential mass steps can be found around m/z 24, m/z 48, m/z 58, m/z 65 and m/z 79. These steps could be caused by CN − Arnold et al (1971Arnold et al ( , 1982 and Kopp (1992). The heavy-ion signature is now clearly modulated by the rocket spin (3.6 Hz) with the maxima being about 0.27 s apart and thus requiring 4.5 modulations of the incident ion flux within a full spectrum.…”

Section: Negative Ionsmentioning

confidence: 99%

A novel rocket-borne ion mass spectrometer with large mass range: instrument description and first-flight results

et al. 2021

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Abstract. We present a novel rocket-borne ion mass spectrometer named ROMARA (ROcket-borne MAss spectrometer for Research in the Atmosphere) for measuring atmospheric positive and negative ions (atomic, molecular and cluster ions) and positively and negatively charged meteor smoke particles. Our ROMARA instrument has, compared to previous rocket-borne ion mass spectrometers, a markedly larger mass range of up to m/z 2000 and a larger sensitivity, particularly for meteor smoke particle detection. The major objectives of this first ROMARA flight included the following: a functional test of the ROMARA instrument, measurements between 55 and 121 km in the mass range of atmospheric positive and negative ions, a first attempt to conduct mass spectrometric measurements in the mass range of meteor smoke particles with mass-to-charge ratios up to m/z 2000, and measurements inside a polar mesospheric winter echo layer as detected by ground-based radar. Our ROMARA measurements took place on the Arctic island of Andøya, Norway, at around noon in April 2018 and represented an integral part of the polar mesospheric winter radar echo (PMWE) rocket campaign. During the rocket flight, ROMARA was operated in a measurement mode, offering maximum sensitivity and the ability to qualitatively detect total ion signatures even beyond its mass-resolving mass range. On this first ROMARA flight we were able to meet all of our objectives. We detected atmospheric species including positive atomic, molecular and cluster ions along with negative molecular ions up to about m/z 100. Above m/z 2000, ROMARA measured strong negative-ion signatures, which are likely due to negatively charged meteor smoke particles.

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Charge transfer dynamics of low energy oxygen ion beams scattered from Cu(0 0 1)

Lavery

Sosolik

Cooper

1999

Nuclear Instruments and Methods in Physics Research Section B:

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Quantitative detection of low energy positive and negative ions with a channel electron multiplier

Cited by 8 publications

References 15 publications

Absolute calibration of a multichannel plate detector for low energy O, O−, and O+

Absolute calibration of a multichannel plate detector for low energy O, O−, and O+

A novel rocket-borne ion mass spectrometer with large mass range: instrument description and first-flight results

Charge transfer dynamics of low energy oxygen ion beams scattered from Cu(0 0 1)

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