Title :
A 303-MHz frequency standard based on trapped Be/sup +/ ions
Author :
Bollinger, J.J. ; Heinzen, D.J. ; Itano, W.M. ; Gilbert, S.L. ; Wineland, D.J.
Author_Institution :
Nat. Inst. of Stand. & Technol., Boulder, CO, USA
Abstract :
A 303-MHz hyperfine transition in the ground state of Be/sup +/ ions stored in a Penning trap was used as the basis for a frequency standard. Linewidths as narrow as 900 mu Hz were obtained. The inaccuracy in the second-order Doppler shift was reduced to 5 parts in 10/sup 15/ by laser cooling.<>
Keywords :
Doppler effect; atomic hyperfine structure; beryllium; frequency measurement; measurement standards; particle traps; radiation pressure (atoms); 303 MHz; 900 muHz; Penning trap; frequency standard; ground state; hyperfine transition; laser cooling; second-order Doppler shift; trapped Be/sup +/; Clocks; Cooling; Doppler shift; Energy states; Frequency measurement; Laser transitions; Magnetic fields; Narrowband; Optical pumping; Stationary state;
Conference_Titel :
Precision Electromagnetic Measurements, 1990. CPEM '90 Digest., Conference on
Conference_Location :
Ottawa, Ontario, Canada
DOI :
10.1109/CPEM.1990.110016
