Abstract
The largest systematic uncertainty in the performance of atomic frequency standards using a cloud of ions stored in an rf quadrupole trap is the second-order Doppler shift which depends on ion temperature and trapping parameters. This paper presents evidence that cooling the ions by collisions with atoms of a background gas light compared to the ions results in the condensation of the ions into a cloud of almost uniform density determined by space charge versus potential well forces. In this condition the second-order Doppler shift is simple to calculate and is found to depend only on readily measured characteristics of the ion cloud. This along with already observed good signal-to-noise ratio shows that the frequency standard we have constructed using the hyperfine splitting of singly ionized199Hg, with helium cooling can have an order of magnitude better performance in accuracy, stability, and reproducibility than presently available commercial cesium beam standards.
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F.G. Major, G. Werth: Phys. Rev. Lett.30, 1155 (1973)
M.D. McGuire, R. Petsch, G. Werth: Phys. Rev. A17, 1999 (1978)
M.D. McGuire: Proc. 31 st Annual Symp. Frequency Control (1977), Electronic Industries Assoc, p. 612
M. Jardino, M. Desaintfuscien, R. Barillet, J. Viennet, P. Petit, C. Audoin: Appl. Phys.24, 107 (1981)
L.S. Cutler, R.P. Giffard, M.D. McGuire: Proc. 37th Annual Symp. Frequency Control (1983), Systematics General Corp., p. 32
H.G. Dehmelt Adv. At. Mol. Phys3, 53 (1967)
J.F. Todd, D.A. Freer, R.M. Waldren: Int. J. Mass. Spectrosc. Ion Phys.36, 185 (1980)
R.D. Knight: Ph. D. Thesis, Univ. California, Berkeley (1979), Lawrence Berkeley Lab Publication LBL 9082
R. Ifflaender, G. Werth: Metrologia13, 167 (1977)
R.D. Knight, M.H. Prior: J. Appl. Phys.50, 3044 (1979)
H. Schaaf, V. Schmeling, G. Werth: Appl. Phys.25, 249 (1981)
W. Neuhauser, G. Foerster, P.E. Toschek, H. Dehmelt: Phys. Rev. Lett.41, 233 (1978)
D.A. Church, H.G Dehmelt: J. Appl. Phys.40, 3421 (1969)
F.G. Major, H.G. Dehmelt: Phys. Rev.170, 91 (1968)
P.H. Dawson, N.R. Whetten: Naturwissenschaften56, 109 (1969)
D.A. Church: J. Appl. Phys.40, 3127 (1969)
L.M. Chanin, M.A. Biondi: Phys. Rev.107, 1219 (1957)
E.W. McDaniel:Collision Phenomena in Ionized Gases (Wiley, New York 1964) p. 429
M.D. McGuire, E.N. Fortson: Phys. Rev. Lett.33, 737 (1974)
R.F. Wuerker, H. Shelton, R.V. Langmuir: J. Appl. Phys.30, 342 (1959)
R.H. Dicke: Phys. Rev.89, 472 (1953)
L.S. Cutler, R.P. Giffard, M.D. McGuire: Proc. 13th Annual PTTI Appl. and Planning Meeting (1981), NASA Conf. Publ. 2220, p. 563
H.D. Schuessler, C.H. Holder: J. Appl. Phys.50, 5110 (1979)
M.N. Gabouriaud, M. Desaintfuscien, F.G. Major: Int. J. Mass Spectrosc. Ion Phys.41, 109 (1981)
S. Dushman, J.F. Lafferty:Scientific Foundations of Vacuum Technique, 2nd edn. (Wiley, New York 1962) p. 324
J. Vetter, M. Stuke, E.W. Weber: Z. Phys. A273, 129 (1975)
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Cutler, L.S., Giffard, R.P. & McGuire, M.D. Thermalization of199Hg ion macromotion by a light background gas in an RF quadrupole trap. Appl. Phys. B 36, 137–142 (1985). https://doi.org/10.1007/BF00691778
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DOI: https://doi.org/10.1007/BF00691778