Femtosecond

A femtosecond is one billionth of one millionth, or one quadrillionth of a second. It can be written as 10-15 second. Even shorter than this is an attosecond.

 200 femtoseconds  -  the fastest chemical reactions
 300 femtoseconds  -  how long it takes for the atoms of an iodine molecule to vibrate

Category:Orders of magnitude
Category:Units of time