from The American Heritage® Dictionary of the English Language, 4th Edition
- n. One sextillionth (10-21) of a second.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A unit of time equal to 0.000 000 000 000 000 000 001 seconds and with symbol zs.
Marangos thinks even shorter pulses are possible, saying zeptosecond pulses (trillionths of a billionth of a second!) might be possible.
A zeptosecond is one-billion-trillionth of a second 10-21 s.
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