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nounone quadrillionth (10^-15) of a second; one thousandth of a picosecondtype of:part of:
Definition that contains femtosecond
- attosecond one quintillionth (10^-18) of a second; one thousandth of a femtosecond
- femtochemistry the branch of chemistry that studies elementary (often very fast) chemical reactions as they occur; the experimental methods are often based on the use of femtosecond laser pulses