单词	femtosecond
释义	femtosecond /ˈfɛmtə(ʊ)sɛkənd / (abbreviation fs) noun One quadrillionth of a second.With femtosecond pulses, scientists could for the first time directly observe the shifts in interatomic spacings that take place during reactions.... A femtosecond is to one second in duration what one second is to 30 million years. In other words, what could you do with a femtosecond x-ray source?
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