Caesium clock

Caesium clock

H305/0261 Rights Managed

Request low-res file

530 pixels on longest edge, unwatermarked

Request/Download high-res file

Uncompressed file size: 45.0MB

Downloadable file size: 2.6MB

Price image Pricing

Please login to use the price calculator


Credit: ANDREW BROOKES, NATIONAL PHYSICAL LABORATORY/SCIENCE PHOTO LIBRARY

Caption: Caesium clock vacuum chamber. This atomic clock, also known as a frequency standard, uses a caesium 'fountain' to measure the exact length of one second. The fountain contains atoms that oscillate between two energy levels at high speed. Counting these oscillations is the basis for the standard second. The current basis for the international definition of time is the caesium atomic clock, where one second is about 9193 million oscillations of caesium-133 atoms. Physicists are investigating whether alternative time measurements can be gained by using different elements such as rubidium and strontium. Photographed at the National Physical Laboratory in Teddington, UK.

Release details: Model release not required. Property release not required.

Keywords: accuracy, accurate, atom, atomic clock, atomic fountain, atomic frequency standard, atoms, britain, british, caesium clock, caesium fountain, device, equipment, instrument, lab, laboratory, machine, national physical laboratory, npl, oscillate, oscillations, physical, physics, science, scientific, second, standard, technological, technology, teddington, time, uk, united kingdom, vacuum chamber

Licence fees: A licence fee will be charged for any media (low or high resolution) used in your project.