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An attosecond is an SI unit of time equal to 10−18 of a second (one quintillionth of a second).〔(【引用サイトリンク】title=attosecond )〕 For context, an attosecond is to a second what a second is to about 31.71 billion years.〔(Electron Motion Filmed ), 28 Feb. 2008〕〔(Exploring "Attosecond" Time. Visualising an Attosecond... How short is an attosecond? )〕 The word "attosecond" is formed by the prefix ''atto'' and the unit ''second''. ''Atto-'' was made from the Danish word for eighteen (''atten'').〔. www.ScienceDaily.com. Retrieved on 2012-09-04.〕 * 100 attoseconds: fastest ever view of molecular motion〔http://news.bbc.co.uk/1/hi/sci/tech/4766842.stm Science, 312, p424, April 2006 http://www.sciencemag.org/cgi/content/full/312/5772/424〕 * 200 attoseconds (approximately): half-life of beryllium-8, maximum time available for the triple-alpha process for the synthesis of carbon and heavier elements in stars * 320 attoseconds: estimated time it takes electrons to transfer between atoms〔(Electron timed hopping between atoms – physics-math – 20 July 2005 ). New Scientist. Retrieved on 2011-01-23.〕 * (Longer time: femtosecond) ==See also== *Attophysics *Flash (comics) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Attosecond」の詳細全文を読む スポンサード リンク
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