Picosecond

A picosecond (abbreviated as ps) is a unit of time in the International System of Units (SI) equal to 10−12 or 1⁄1 000 000 000 000 (one trillionth) of a second. That is one trillionth, or one millionth of one millionth of a second, or 0.000 000 000 001 seconds. A picosecond is to one second as one second is to approximately 31,689 years. Multiple technical approaches achieve imaging within single-digit picoseconds: for example, the streak camera or intensified CCD (ICCD) cameras are able to picture the motion of light.[1][2]

One picosecond is equal to 1000 femtoseconds, or 1/1000 nanoseconds. Because the next SI unit is 1000 times larger, measurements of 10−11 and 10−10 second are typically expressed as tens or hundreds of picoseconds. Some notable measurements in this range include:

  • 1.0 picoseconds (1.0 ps) – cycle time for electromagnetic frequency 1 terahertz (THz) (1 x 1012 hertz), an inverse unit. This corresponds to a wavelength of 0.3 mm, as can be calculated by multiplying 1 ps by the speed of light (approximately 3 x 108 m/s) to determine the distance traveled. 1 THz is in the far infrared.
  • 1 picosecond – time taken by light in vacuum to travel approximately 0.30 mm
  • 1 picosecond – half-life of a bottom quark
  • ~1 picosecond – lifetime of a single H
    3    O+
     (hydronium) ion in water at 20 °C[3]
  • picoseconds to nanoseconds – phenomena observable by dielectric spectroscopy
  • 1.2 picoseconds – switching time of the world's fastest transistor (845 GHz, as of 2006)[4]
  • 1.7 picoseconds – rotational correlation time of water[5]
  • 3.3 picoseconds (approximately) – time taken for light to travel 1 millimeter
  • 10 picoseconds after the Big Bang – electromagnetism separates from the other fundamental forces
  • 34 picoseconds – signal rise time (20% to 80%) of a SFP+ transmitter for 10 Gigabit Ethernet.[6]
  • 10–150 picoseconds – rotational correlation times of a molecule (184 g/mol) from hot to frozen water[7]
  • 100 picoseconds – Unit Interval of a 10 Gbps serial communication link, such as USB 3.1.[8]
  • 108.7827757 picoseconds – transition time between the two hyperfine levels of the ground state of the caesium-133 atom at absolute zero
  • 330 picoseconds (approximately) – the time it takes a common 3.0 GHz computer CPU to complete a processing cycle

See also

References

  1. ^ "Trillion-frame-per-second video". Massachusetts Institute of Technology. Retrieved 2014-03-06.
  2. ^ "Ultra high speed CCD cameras capture the motion of light". Stanford Computer Optics. Retrieved 2014-03-06.
  3. ^ "Lifetime of single hydronium (H3O+) ion at 20°C". BioNumbers. Retrieved 2011-10-10.
  4. ^ James E. Kloeppel (2006-12-11). "World's Fastest Transistor Approaches Goal of Terahertz Device".
  5. ^ Lankhorst, D.; Schriever, J.; Leyte, J. C. (1982). "Determination of the Rotational Correlation Time of Water by Proton NMR Relaxation in H217O and Some Related Results". Berichte der Bunsengesellschaft für physikalische Chemie. 86 (3): 215–221. doi:10.1002/bbpc.19820860308.
  6. ^ SFF Committee. "SFF-8431 Specifications for Enhanced Small Form Factor Pluggable Module SFP+" (PDF).
  7. ^ Bulla, I.; Törmälä, P.; Lindberg, J. J.; Mikalsen, Ø.; Southern, J. T.; Edlund, K.; Eliasen, M.; Herskind, C.; Laursen, T.; Pedersen, P. M. L. (1975). "Spin Probe Studies on the Dynamic Structure of Dimethyl Sulfoxide-Water Mixtures". Acta Chemica Scandinavica. 29a: 89–92. doi:10.3891/acta.chem.scand.29a-0089.
  8. ^ "Universal Serial Bus 3.1 Specification" (PDF).

External links

  • National Institute for Standards and Technology Glossary
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