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One quintillionth of a second
An attosecond is 1×10-18 of a second (one quintillionth of a second). For context, an attosecond is to a second what a second is to about 31.71 billion years.
The word "attosecond" is formed by the prefixatto and the unitsecond. Atto- was derived from the Danish word for eighteen (atten). Its symbol is as.
An attosecond is equal to 1000 zeptoseconds, or 1⁄1000 of a femtosecond. Because the next higher SI unit for time is the femtosecond (10-15 seconds), durations of 10-17 s and 10-16 s will typically be expressed as tens or hundreds of attoseconds:
Times which can be expressed in attoseconds:
0.247 attoseconds: travel time of a photon across "the average bond length of molecular hydrogen"