U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Journals

Frequency ratio of Al+ and Hg+ single-ion optical clocks; metrology at the 17th decimal place

Author(s)
Till P. Rosenband, David Hume, P. O. Schmidt, Chin-Wen Chou, Anders Brusch, Luca Lorini, Windell Oskay, Robert E. Drullinger, Tara M. Fortier, Jason Stalnaker, Scott A. Diddams, Nathan R. Newbury, W Swann, Wayne M. Itano, David J. Wineland, James C. Bergquist
We report the frequency ratio of the two most accurate and stable atomic clocks with a total fractional uncertainty of 5.2 X 10 -17 . This frequency ratio is

Vibrational modes of nanolines

Author(s)
Paul R. Heyliger, Colm Flannery, Ward L. Johnson
Brillouin-light-scattering spectra previously have been shown to provide information on acoustic modes of polymeric lines fabricated by nanoimprint lithography

Two-Body Transients in Coupled Atomic-Molecular BECs

Author(s)
Pascal Naidon, Eite Tiesinga, Paul S. Julienne
We discuss the dynamics of an atomic Bose-Einstein condensate when pairs of atoms are converted into molecules by single-color photoassociation. Three main

The Beginnings of This TRANSACTIONS

Author(s)
Dylan F. Williams, Admir Mortazawi
In July, 1951, Ben Warriner (chairman, 1952-1953) circulated a petition to begin the Microwave Theory and Techniques Society under the auspices of the Institute

The piston dispersive shock wave problem

Author(s)
Mark Hoefer, Mark J. Ablowitz, Peter Engels
The one-dimensional piston shock problem is a classical result of shock wave theory. In this work, the analogous dispersive shock wave (DSW) problem for a

Non-Brownian Microrheology of a Fluid Gel Interface

Author(s)
Erik K. Hobbie, Sheng Lin-Gibson, S K. Kumar
We use stroboscopic video microscopy to study the motion of a sheared fluid-gel interface. External mechanical noise plays a role analogous to temperature, but

Defining Units in the Quantum SI

Author(s)
Peter J. Mohr
Possible changes to the International System of Units (SI) are being discussed, including a proposal to define the units by specifying the values of a set of
Was this page helpful?