These may be of interest, if the papers have not been circulated here before. — Eric

> These may be of interest, if the papers have not been circulated here before. — Eric Links to the cesium and optical clock papers that Eric just mentioned are: 1) "Cesium Primary Frequency References" by Steven R. Jefferts, Thomas P. Heavner, Elizabeth A. Donley http://tf.boulder.nist.gov/general/pdf/1924.pdf also at: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.527.4789&rep=rep1&type=pdf 2) "Ultracold atoms and precise time standards" by Gretchen K. Campbell, William D. Phillips http://rsta.royalsocietypublishing.org/content/369/1953/4078 PDF: http://rsta.royalsocietypublishing.org/content/roypta/369/1953/4078.full.pdf See also this powerpoint presentation by the same: "Ultracold Atoms and Precise Time Standards" by William D. Phillips and Gretchen Campbell https://www.bipm.org/utils/common/pdf/RoySoc/Bill_Phillips.pdf ---------- And while we're at it, let me repeat these other papers mentioned recently. 3) "A New Era for Atomic Clocks" by Laura Ost https://phys.org/news/2014-02-era-atomic-clocks.html https://www.nist.gov/news-events/news/2014/02/new-era-atomic-clocks 4) "When should we change the definition of the second?" by Patrick Gill http://rsta.royalsocietypublishing.org/content/369/1953/4109.article-info PDF at: http://rsta.royalsocietypublishing.org/content/roypta/369/1953/4109.full.pdf 5) "Optical Atomic Clocks" by Andrew D. Ludlow, Martin M. Boyd, Jun Ye, Ekkehard Peik, Piet O. Schmidt https://arxiv.org/abs/1407.3493 PDF at: https://arxiv.org/pdf/1407.3493.pdf Exciting times. /tvb ----- Original Message ----- From: "Eric Scace" <eric@scace.org> To: <time-nuts@febo.com> Sent: Tuesday, November 14, 2017 2:12 PM Subject: [time-nuts] Jefferts & Campbell recent papers These may be of interest, if the papers have not been circulated here before. — Eric