Title :
Ultra-stable Hg+ trapped ion frequency standard
Author :
Prestage, J.D. ; Tjoelker, R.L. ; Dick, G.J. ; Maleki, L.
Author_Institution :
Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA
Abstract :
The authors report the development of a fieldable frequency standard based on 199Hg+ ions confined in a hybrid RF/DC linear ion trap. This trap permits storage of large numbers of ions with reduced susceptibility to the second-order Doppler effect caused by the RF confining fields. A 160-mHz-wide atomic resonance line for the 40.5-GHz clock transition is used to steer the output of a 5-MHz crystal oscillator to obtain a stability of 2×10-15 for 24000 second averaging times. For long averaging intervals measurements are limited by instabilities in available hydrogen maser frequency standards
Keywords :
atomic clocks; frequency measurement; frequency stability; measurement standards; mercury (metal); 0.160 Hz; 24000 s; 40.5 GHz; 5 MHz; 199Hg+ ions; H maser frequency standards; Hg+ trapped ion frequency standard; atomic resonance line; averaging times; clock transition; crystal oscillator; fieldable frequency standard; hybrid RF/DC linear ion trap; long averaging intervals measurements; stability; Atomic measurements; Clocks; Doppler effect; Frequency measurement; Mercury (metals); Oscillators; Radio frequency; Resonance; Stability; Standards development;
Conference_Titel :
Frequency Control, 1991., Proceedings of the 45th Annual Symposium on
Conference_Location :
Los Angeles, CA
Print_ISBN :
0-87942-658-6
DOI :
10.1109/FREQ.1991.145953
