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Attosecond
SI unit of time equal to one quintillionth of a second or 1/1,000th of a femtosecond
An attosecond (abbreviated as as) is a unit of time in the International System of Units (SI) equal to 10−18 or 1⁄1 000 000 000 000 000 000 (one quintillionth) of a second. An attosecond is to a second, as a second is to approximately 31.69 billion years.
From Wikipedia
An attosecond (abbreviated as as) is a unit of time in the International System of Units (SI) equal to 10−18 or 1⁄1 000 000 000 000 000 000 (one quintillionth) of a second. An attosecond is to a second, as a second is to approximately 31.69 billion years. The attosecond is a tiny unit, but it has various potential applications: it can observe oscillating molecules, the chemical bonds formed by atoms in chemical reactions, and other extremely tiny and extremely fast things. One attosecond is equal to 1000 zeptoseconds, or 1/1000 femtosecond. Because the next SI unit is 1000 times larger, measurements of 10−17 and 10−16 second are typically expressed as tens or hundreds of attoseconds.
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SI unit of time equal to one septillionth of a second or 1/1,000th of a zeptosecond
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10⁹ (one billion) years; geological unit of time
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SI unit of time equal to one sextillionth of a second or 1/1,000th of an attosecond
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Atto-
Prefix denoting 10 to the −18th power