A unit of length used in the past to express the wavelength of X-rays and other rays. 1 X-ray unit ≒ 1.002× 10-13 m. The symbol is X or XU in English, and XE in German. The cleavage spacing of rock salt was first calculated using Avogadro's number as 2.814× 10-8 Å, but was changed to 2814.00 X-ray units. This resulted in a slight difference, mainly due to Avogadro's number, and led to the distinction between Å and 103 X-ray units. It is defined as 1/3029.45 of the cleavage spacing of calcite at 18°C. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
X線などの波長を表すのに過去において使われた長さの単位。1X線単位≒1.002×10-13m。記号は英語でX,XU,ドイツ語でX.E.など。最初にアボガドロ数を使って岩塩のへき開面間隔を2.814×10-8Åと計算されているのを2814.00X線単位としたため,おもにアボガドロ数に起因するわずかの違いがでて,Åと103X線単位とは区別されるようになった。定義は18℃の方解石のへき開面間隔の1/3029.45。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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