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 |
<<: X-ray inspection - X-ray inspection
There are various branches of samurai who were act...
One of the imperial guards of the Ming Dynasty in ...
...The ruins were excavated by A. Fuller in 1896,...
The capital of Georgia, located in the northwest ...
It is a landlocked country located almost in the ...
…It ran from 1832 to 1893. It was published by th...
Raindrops that are supercooled near or below free...
A plain in the lower reaches of the Hino River in...
A hot spring facing the Yatsushiro Sea in Yatsushi...
…Wayang goreh in Western Java is still popular to...
A village in Seta County, central Gunma Prefecture...
…Some species, such as Gerrothorax , had external...
An individual's given name. In Japan, a person...
…In 1829, he became professor of mineralogy and p...
… [Noboru Fujita]. … *Some of the terminology tha...