Pulse-height distribution of output signals in positive ion detection by a microchannel plate

Kenji Furuya, Yoshihiko Hatano

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Positive ions produced by a 120eV electron impact on H2, He, CH4, N2, CO2, and Kr were detected with a microchannel plate (MCP), and the pulse-height distributions (PHDs) of the output signals were observed. As a result, the half width at half maximum (HWHM) of the region above the peak of the PHD was almost independent of the kind of ion. This finding demonstrates that the HWHM is due only to the amplification of the secondary electrons that emerged as a result of the collision of the ions with the surface of the MCP. The dependence of the peak position and the HWHM against the potential difference applied between the front and back of the MCP was also examined. It was found that the plots of the HWHM as a function of the potential difference applied to the MCP could be fitted by a linear line very well. A formula that can reproduce the observed PHDs is presented as a function of the potential applied to the MCP and the mass number. A relation of the mean peak height in the PHD to the potential applied to the MCP and the mass number is also presented.

Original languageEnglish
Pages (from-to)237-243
Number of pages7
JournalInternational Journal of Mass Spectrometry
Volume218
Issue number3
DOIs
Publication statusPublished - Jul 15 2002

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microchannel plates
pulse amplitude
Microchannels
positive ions
Positive ions
output
Ions
Electrons
electron impact
Amplification
ions
plots
collisions
electrons

All Science Journal Classification (ASJC) codes

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

Cite this

Pulse-height distribution of output signals in positive ion detection by a microchannel plate. / Furuya, Kenji; Hatano, Yoshihiko.

In: International Journal of Mass Spectrometry, Vol. 218, No. 3, 15.07.2002, p. 237-243.

Research output: Contribution to journalArticle

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AB - Positive ions produced by a 120eV electron impact on H2, He, CH4, N2, CO2, and Kr were detected with a microchannel plate (MCP), and the pulse-height distributions (PHDs) of the output signals were observed. As a result, the half width at half maximum (HWHM) of the region above the peak of the PHD was almost independent of the kind of ion. This finding demonstrates that the HWHM is due only to the amplification of the secondary electrons that emerged as a result of the collision of the ions with the surface of the MCP. The dependence of the peak position and the HWHM against the potential difference applied between the front and back of the MCP was also examined. It was found that the plots of the HWHM as a function of the potential difference applied to the MCP could be fitted by a linear line very well. A formula that can reproduce the observed PHDs is presented as a function of the potential applied to the MCP and the mass number. A relation of the mean peak height in the PHD to the potential applied to the MCP and the mass number is also presented.

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