Detail Frequency Ratio of Al+ and Hg+ Single-Ion Optical Clocks; Metrology at the 17th Decimal Place   Oleh:  Rosenband, T. ; Hume, D. B. ; Schmidt, P. O. ; Chou, C. W. Jenis: Article from Bulletin/Magazine Dalam koleksi: SCIENCE (keterangan: ada di Proquest) vol. 319 no. 5871 (Mar. 2008), page 1808-1811. Ketersediaan Perpustakaan FK Nomor Panggil: S01.K.2008.03 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada     Lihat Detail Induk Isi artikel Time has always had a special status in physics because of its fundamental role in specifying the regularities of nature and because of the extraordinary precision with which it can be measured. This precision enables tests of fundamental physics and cosmology, as well as practical applications such as satellite navigation. Recently, a regime of operation for atomic clocks based on optical transitions has become possible, promising even higher performance. We report the frequency ratio of two optical atomic clocks with a fractional uncertainty of 5.2 x 10–17. The ratio of aluminum and mercury single-ion optical clock frequencies {nu}Al+/{nu}Hg+ is 1.052871833148990438(55), where the uncertainty comprises a statistical measurement uncertainty of 4.3 x 10–17, and systematic uncertainties of 1.9 x 10–17 and 2.3 x 10–17 in the mercury and aluminum frequency standards, respectively. Repeated measurements during the past year yield a preliminary constraint on the temporal variation of the fine-structure constant {alpha} of Formula. Opini Anda Klik untuk menuliskan opini Anda tentang koleksi ini! Kembali

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