8/7/2023 0 Comments Utexas nist chemistry webook![]() ![]() The vacuum chambers where the atoms travel are key to the success of these clocks, but they’re bulky in part due to the size of the microwave cavity used to probe the atomic “ticking.” The vacuum chamber for NIST-7, the last beam clock used for the primary frequency standard in the U.S., was more than 2.5 meters or 8 feet long. Beam clocks are precise, stable and accurate, but they’re currently not the most portable. For decades, beam clocks were used to keep the primary standard for the second, and they are still part of NIST’s national timekeeping ensemble. NIST has been using atomic beams for timekeeping since the 1950s. At one end of the chamber, the atoms are set in a specific quantum state, and they start “ticking.” At the other end their ticking rate is measured or “read out.” Using the atoms’ precise ticking rate, other clocks can be compared to atomic beam clocks, and adjusted to match their timing. These clocks send a beam of atoms through a vacuum chamber. Their work has been published in Nature Communications.Ītomic clocks take many forms, but the oldest and one of the most prominent designs is built using atomic beams. Researchers at the National Institute of Standards and Technology (NIST), in collaboration with researchers from Georgia Tech, have made the first-of-its-kind chip-scale beam clock. ![]() A new type of miniature atomic clock could provide better timing over the span of weeks and months compared with current systems. ![]()
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