TITLE

The flattening phase transition in systems of trapped ions

AUTHOR(S)
Closson, Taunia L. L.; Roussel, Marc R.
PUB. DATE
October 2009
SOURCE
Canadian Journal of Chemistry;Oct2009, Vol. 87 Issue 10, p1425
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
When the anisotropy of a harmonic ion trap is increased, the ions eventually collapse into a two-dimensional structure consisting of concentric shells of ions. This collapse generally behaves like a second-order phase transition. A graph of the critical value of the anisotropy parameter vs. the number of ions displays substructure closely related to the inner-shell configurations of the clusters. The critical exponent for the order parameter of this phase transition (maximum extent in the z direction) was found computationally to have the value � = 1/2. A second critical exponent related to displacements perpendicular to the z axis was found to have the value d = 1. Using these estimates of the critical exponents, we derive an equation that relates the amplitudes of the displacements of the ions parallel to the x�y plane to the amplitudes along the z axis during the flattening process.
ACCESSION #
45038253

 

Related Articles

  • Cluster observations of trapped ions interacting with magnetosheath mirror modes. Soucek, J.; Escoubet, C. P. // Annales Geophysicae (09927689);Jun2011, Vol. 29 Issue 6, p1049 

    Mirror modes are among the most intense low frequency plasma wave phenomena observed in the magnetosheaths of magnetized planets. They appear as large amplitude non-propagating fluctuations in the magnetic field magnitude and plasma density. These structures are widely accepted to represent a...

  • A simple method for counting the number of trapped ions in an ion trap. Okada, K.; Nakamura, T.; Ohtani, S.; Wada, M.; Tanaka, J.; Kawakami, H.; Katayama, I.; Schnier, D.; Schuessler, H.A.; Becker, O.; Arbes, F.; Werth, G. // Applied Physics B: Lasers & Optics;1997, Vol. 64 Issue 1, p91 

    Recommends a method to reliably count the number of ions in an ion trap. Difficulties associated with estimating the excitation rate of ions; Principles of the method.

  • Two-Ion Logic Gates Open the Way to Further Advances in Quantum Computing. Levi, Barbara Goss // Physics Today;May2003, Vol. 56 Issue 5, p17 

    Reports that research groups at the University of Innsbruck, Austria and at the National Institute of Science and Technology in Boulder, Colorado used different approaches to demonstrate the operation of conditional gates on systems of two trapped ions. Background on the CNOT gate demonstrated...

  • Self-trapping of a rotating ion ring. Albright, B. J.; Faehl, R. J. // Physics of Plasmas;Sep2001, Vol. 8 Issue 9 

    A fluid model is presented that describes the linear evolution of a thin layer of beam ions in a conducting cylindrical cavity with a narrow rotating beam layer, and a dispersion relation is computed for the low-frequency electromagnetic response of the system. For a broad range of ion ring...

  • Isomorphous substitution and luminescence properties of haloapatites synthesized by the low-temperature method. Savin, Yu. N.; Babayevskaya, N. V.; Tolmachev, A. V. // Crystallography Reports;Dec2008, Vol. 53 Issue 7, p1256 

    Single-phase polycrystalline fluorapatites of the Ca10 − x Me x (PO4)6F2:Eu3+ ( Me = Pb, Mg) composition are obtained by deposition from aqueous solutions. The effect of modifier ions (Pb2+, Mg2+) with significantly different ionic radii on the structure and spectral luminescence...

  • Continuous highly charged ion beams from the National Institute of Standards and Technology... Ratliff, L.P.; Bell, E.W.; Parks, D.C.; Pikin, A.I.; Gillaspy, J.D. // Review of Scientific Instruments;May97, Vol. 68 Issue 5, p1998 

    Describes a modified beam line and its performance in conjunction with the National Institute of Standards and Technology electron beam ion trap (EBIT). Components of the trap; Highest intensity time-averaged ion fluxes achieved; Production of highly charged ion beams from an EBIT source using...

  • Neutral electron trap generation in SiO2 by hot holes. Ogawa, Shigeo; Shiono, Noboru; Shimaya, Masakazu // Applied Physics Letters;4/2/1990, Vol. 56 Issue 14, p1329 

    Experimental evidence for neutral electron trap generation in SiO2 caused by injected holes is presented. The neutral electron traps are detected by Fowler–Nordheim (FN) tunneling electron injection after avalanche hole injection. The density of generated neutral traps increases with the...

  • Trapped fields of large-grain Nd-Ba-Cu-O superconductors. Matsui, M.; Nariki, S.; Sakai, N.; Murakami, M. // AIP Conference Proceedings;2002, Vol. 614 Issue 1, p405 

    We fabricated Ag[sub 2]O-doped single-domain Nd-Ba-Cu-O bulk superconductors with different Nd422 content in 1%O[sub 2]-Ar atmosphere. The trapped field values were dependent on Nd422 content, and an appropriate amount of Nd422 addition was effective in enhancing the trapped field and J[sub c]...

  • Study of diffusion and trapping of a fluorinated hydrocarbon in ion beam irradiated.... Umezawa, Kenji; Nakanishi, Shigemitu // Applied Physics Letters;9/19/1994, Vol. 65 Issue 12, p1501 

    Examines fluorinated hydrocarbon diffusion and trapping in an ion beam irradiated poly(styrene). Information on the diffusion coefficient of the trifluoromethyl aniline (TFMA); Applications of the ion beam implantation technique; Details on the TFMA trapping between two different ion beam...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sign out of this library

Other Topics