"m/z" and "Mass-to-Charge Ratio"

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  • YOSHINO Ken-ichi
    Biosignal Research Center, Organization of Advanced Science and Technology, Kobe University The Integrated Center for Mass Spectrometry, Graduate School of Medicine, Kobe University

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  • 用語を通して学ぶ質量分析基礎の基礎第２回「ｍ／ｚ　と質量電荷比」
  • ヨウゴ オ トオシテ マナブ シツリョウ ブンセキ キソ ノ キソ ダイ2カイ m z ト シツリョウ デンカヒ

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Mass spectrometers separate ions according to each mass/charge value, which is not a dimensionless quantity. However, the m/z value indicated in the abscissa of mass spectra is defined as a dimensionless quantity and not a numerical value the same as the mass/charge value in kilograms/coulombs (kg/C) or in unified atomic mass units/coulombs (u/C). The numerical value of m/z converted from the mass/charge value depends on the unified atomic mass unit and the physical constant “elementary charge,” e that is also the atomic unit of charge. This conversion confuses many mass spectrometrists with regard to the abscissa labeling of mass spectra, e.g. the symbol “m/z” is considered as an abbreviation of the term “mass-to-charge ratio.”

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