To help compare orders of magnitude of different times this page lists times between 10⁻¹⁸ seconds and 10⁻¹⁵ seconds (1 attosecond and 1 femtosecond) See also times of other orders of magnitude.

The word attosecond originates from the Nordic word for eighteen (atten).

• shorter times
• 1 attosecond – estimated time it takes for an atomic nucleus to recoil
• about 100 as – record for shortest time interval measured as of February 2004 (BBC News)
• about 200 as – half-life of beryllium-8 which is important for stellar nucleosynthesis
• 250 as – the shortest pulses of laser light yet created (2002)
• 320 as – estimated time it takes electrons to hop between atoms
• longer times

Orders of magnitude (time)

1 E-18 s | 1 E-18 s