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Title: Measurement of isotope ratio of Ca{sup +} ions in a linear Paul Trap

Abstract

Measurement of isotope ratios of Calcium is very useful in many fields. So we demonstrated the measurement of isotope ratios of {sup 40}Ca{sup +}(abundance 96.4%) to {sup 44}Ca{sup +}(2.09%) ions in a linear Paul trap with several laser lights tuning to the isotope shifts. And we found that the experimental parameters had large influences on the measurement of the isotope ratios.

Authors:
; ; ;  [1]
  1. Department of Quantum Engineering and Systems Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan)
Publication Date:
OSTI Identifier:
21293405
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1104; Journal Issue: 1; Conference: LAP 2008: 4. international conference on laser probing, Nagoya (Japan), 6-10 Oct 2008; Other Information: DOI: 10.1063/1.3115607; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; CALCIUM 40; CALCIUM 44; CALCIUM IONS; COOLING; ISOTOPE RATIO; LASER RADIATION; MEASURING METHODS; PHOTON-ION COLLISIONS; SPECTRAL SHIFT; TRAPS

Citation Formats

Hashimoto, Y., Minamino, K., Nagamoto, D., and Hasegawa, S. Measurement of isotope ratio of Ca{sup +} ions in a linear Paul Trap. United States: N. p., 2009. Web. doi:10.1063/1.3115607.
Hashimoto, Y., Minamino, K., Nagamoto, D., & Hasegawa, S. Measurement of isotope ratio of Ca{sup +} ions in a linear Paul Trap. United States. doi:10.1063/1.3115607.
Hashimoto, Y., Minamino, K., Nagamoto, D., and Hasegawa, S. 2009. "Measurement of isotope ratio of Ca{sup +} ions in a linear Paul Trap". United States. doi:10.1063/1.3115607.
@article{osti_21293405,
title = {Measurement of isotope ratio of Ca{sup +} ions in a linear Paul Trap},
author = {Hashimoto, Y. and Minamino, K. and Nagamoto, D. and Hasegawa, S.},
abstractNote = {Measurement of isotope ratios of Calcium is very useful in many fields. So we demonstrated the measurement of isotope ratios of {sup 40}Ca{sup +}(abundance 96.4%) to {sup 44}Ca{sup +}(2.09%) ions in a linear Paul trap with several laser lights tuning to the isotope shifts. And we found that the experimental parameters had large influences on the measurement of the isotope ratios.},
doi = {10.1063/1.3115607},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1104,
place = {United States},
year = 2009,
month = 3
}
  • Coulomb crystals, containing up to a few hundred ions of which more than 50{percent} were cooled sympathetically by the Coulomb interaction with laser cooled Mg{sup +} ions, have been produced in a linear Paul trap. By controlling the balance of the radiation pressure from the two cooling lasers, the Coulomb crystals could be segregated according to ion species. Previous studies of ion crystals and molecular dynamics simulations suggest that the temperature may be around 10 mK or lower. The obtained results indicate that a wide range of atomic and molecular ions, which due to their internal structures are not amenablemore » to direct laser cooling, can be effectively cooled and localized (crystallized) in linear Paul traps. For high resolution spectroscopy of such ions this may turn out to be very useful. {copyright} {ital 1999 American Institute of Physics.}« less
  • Sympathetic laser cooling of ions stored within a linear-geometry, radio frequency, electric-quadrupole trap has been investigated using computational and theoretical techniques. The simulation, which allows five sample ions to interact with 35 laser-cooled atomic ions, revealed an instability heating mechanism, which can prevent ions below a certain critical mass from being sympathetically cooled. This critical mass can, however, be varied by changing the trapping field parameters, thus allowing ions with a very large range of masses to be sympathetically cooled using a single ion species. A theoretical explanation of this instability heating mechanism is presented which predicts that the cooling-heatingmore » boundary in trapping parameter space is a line of constant q{sub u} (ion trap stability coefficient), a result supported by the computational results. The threshold value of q{sub u} depends on the masses of the interacting ions. A functional form of this dependence is given.« less
  • Coulomb crystals, containing up to a few hundred ions of which more than 50% were cooled sympathetically by the Coulomb interaction with laser cooled Mg{sup +} ions, have been produced in a linear Paul trap. By controlling the balance of the radiation pressure from the two cooling lasers, the Coulomb crystals could be segregated according to ion species. Previous studies of ion crystals and molecular dynamics simulations suggest that the temperature may be around 10 mK or lower. The obtained results indicate that a wide range of atomic and molecular ions, which due to their internal structures are not amenablemore » to direct laser cooling, can be effectively cooled and localized (crystallized) in linear Paul traps. For high resolution spectroscopy of such ions this may turn out to be very useful.« less
  • A tandem linear Paul trap was used to create highly charged Argon ions by electron impact ionizations. By improving the operation scheme, the production of Ar{sup 4+} ions was confirmed. Possible improvements for the future experiments with laser cooled Ca{sup +} ions are suggested.
  • Plasmas of Mg{sup +} ions, containing more than 10{sup 5} ions, have been observed to reach well-ordered (crystalline) states by applying laser cooling. The crystals are highly elongated with up to ten concentric cylindrical shells surrounding a central string. Such large structures have not previously been observed in a Paul trap. The amplitude of the micromotion of the ions can be larger than the shell spacings. As the diameter changes along the crystals, sharp transitions are observed when new shells form, in good agreement with molecular dynamics simulations. The predictions from simulations of how ordering develops with decreasing temperature aremore » also confirmed. {copyright} {ital 1998} {ital The American Physical Society}« less