用語を通して学ぶ質量分析基礎の基礎 : 第3回「イオンや分子の質量の単位, u, Da, amu, mmu」 Units of Atomic Mass ; "u," "Da," "amu," and "mmu"

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著者

    • 吉野 健一 YOSHINO Ken-ichi
    • 神戸大学自然科学系先端融合研究環・バイオシグナル研究センター Biosignal Research Center, Organization of Advanced Science and Technology, Kobe University

抄録

The unified atomic mass unit (unit symbol: u) is a non-SI unit of mass, defined as one-twelfth the mass of a single <sup>12</sup>C atom in its ground state. [SI: Le Système International d'Unités; The International System of Units] This definition was agreed upon by both the International Union of Pure and Applied Physics (IUPAP) and the International Union of Pure and Applied Chemistry (IUPAC) in the early 1960s to resolve a longstanding difference between two scales of the atomic mass unit. The term “atomic mass unit” (unit symbol: amu) has been used as a unit of mass defined as one-sixteenth the mass of a single atom <sup>16</sup>O [<i>m</i>(<sup>16</sup>O)=16 amu] in physics and as one-sixteenth the isotope-averaged atomic mass (equivalent to the atomic weight) of oxygen [<i>A</i><sub>r</sub>(O)=16 amu] in chemistry.<br>The unit dalton (unit symbol: Da) is also a non-SI unit of mass defined as “1 Da=1 u,” and is accepted as a unit for use by the SI in the 8th edition of the SI brochure (2006). Therefore, both the unified atomic mass unit and dalton are authorized units for mass of ions and molecules. <br>It is a common mistake to use the deprecated term “atomic mass unit” and the deprecated unit symbol “amu” for the unit of mass defined as one-twelfth the mass of single atom <sup>12</sup>C. The unit symbol “mmu,” meaning a millimass unit, is also an appropriate unit in SI. Instead of “mmu,” “mDa” or and “10<sup>-3</sup> u” should be used.

収録刊行物

  • 質量分析 = Mass spectroscopy

    質量分析 = Mass spectroscopy 56(6), 269-274, 2008-12-01

    一般社団法人 日本質量分析学会

参考文献:  7件中 1-7件 を表示

各種コード

  • NII論文ID(NAID)
    10024483810
  • NII書誌ID(NCID)
    AN0010555X
  • 本文言語コード
    JPN
  • 資料種別
    REV
  • ISSN
    13408097
  • NDL 記事登録ID
    9743333
  • NDL 雑誌分類
    ZP4(科学技術--化学・化学工業--分析化学)
  • NDL 請求記号
    Z17-213
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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