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Angstrom
The ångström () or angstrom is a unit of length equal to (one ten-billionth of a metre) or . Its symbol is Å, a letter in the Scandinavian alphabets.
The natural sciences and technology often use ångström to express sizes of atoms, molecules, microscopic biological structures, and lengths of chemical bonds, arrangement of atoms in crystals, wavelengths of electromagnetic radiation, and dimensions of integrated circuit parts. Atoms of phosphorus, sulfur, and chlorine are 1 Å in covalent radius, while a hydrogen atom is 0.5 Å; see atomic radius.
The unit is named after the Swedish physicist Anders Jonas Ångström (1814-1874). The symbol is always written with a ring diacritic, as the letter in the Swedish alphabet. The unit's name is often written in English without the diacritics,〔Webster′s Encyclopedic Unabridged Dictionary of the English Language''. Portland House, 1989.〕 but the official definitions contain diacritics.
==Use==
The ångström is used extensively in crystallography, solid-state physics and chemistry as a unit for d-spacings (the distance between atomic planes in a crystal), cell parameters, inter-atomic distances and x-ray wavelengths as these values are often in the 1-10 Å range. For example, the Inorganic Crystal Structure Database presents all these values using the ångström.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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