Now showing items 2-21 of 32

    • Advances in Fetal Magnetocardiography Using SERF Atomic Magnetometers 

      DeLand, Zachary (2017-12)
      Description of experiments and results pertaining to the development of a 4x2 channel atomic magnetometer array for use in detection of fetal magnetocardiography signals.
    • Anisotropic Spin-Exchange 

      Walker, Thad G.; Kadlecek, Stephen; Nelson, Ian (2009-11-25)
      Using measured spin-transfer rates from alkali atoms to 3He, combined with spin-relaxation rates of the alkali atoms due to 3He and 4He, it should be possible to di?erentiate between isotropic and anisotropic spin-exchange. ...
    • The astrophysical r-process: what we are learning from gravitational waves, dwarf galaxies, and stellar archaeology 

      Roederer, Ian (2018-04-27)
      Understanding the origin of the elements is one of the major challenges of modern astrophysics. The rapid neutron-capture process, or r-process, is one of the fundamental ways that stars produce the elements listed along ...
    • Atom-Based Sensors 

      Walker, Thad G (2013-05-16)
      Presentation on quantum limits of NMR gyro performance, major known systematic errors, and new proposed NMR gyro method.
    • Atomic Fock State Preparation Using Rydberg Blockade: Supplementary Material 

      Ebert, Matthew et. al (2013-10-25)
      Supplementary material describing calibration and measurement of mean atom numbers in small atomic ensembles.
    • Codes to accompany "Optically Pumped Atoms" 

      Walker, Thad G.; Happer, William; Jau, Yuan-Yu (2009)
    • DAMOP Student Symposium 2009 

      Walker, Thad G. (2009-05-27)
      Presentation given at the student symposium for DAMOP 2009, Charlottesville, VA, May 21 2009. Includes an introduction to Rydberg physics with a description of recent experiments done at the University of Wisconsin
    • Downstream hydrogen plasma cleaning for mass metrology at NIST 

      Benck, Eric (2018-06-01)
      On International Metrology Day, May 20, 2019, the redefinition of the International System of Units (SI) is scheduled to be implemented. When this occurs the kilogram, the last remaining unit defined by a physical artifact, ...
    • Dynamics of Low Density Rydberg Gases 

      Brekke, Erik; Day, Jason O.; Walker, Thad G. (2008-06-09)
      A state-dependent stimulated emission probe was used to investigate the coherent and dynamic properties of cold Rydberg atoms. 87Rb atoms were excited to various nl Rydberg states from a MOT via continuous two-photon ...
    • A Fresh Look at Abundances of Iron-group Elements in Very Metal-Poor Stars 

      Sneden, Chris (2018-04-27)
      Studies of very metal-poor stars have focused attention on the neutron-capture (Z > 30) elements, whose dramatic star-to-star variations give us insights to element production in extreme, explosive nucleosynthesis environments. ...
    • From nonlocal electrons to delocalized electrons and artificial atoms 

      Kortshagen, Uwe (2018-04-27)
      After spending a portion of his career on nonlocal electron kinetics in plasmas, the speaker entered a new phase of his career with plasma materials synthesis. The talk will discuss how plasmas can be used to synthesize, ...
    • Gas Discharge Lamps – A Requiem 

      Lister, Graeme (2018-04-27)
      Almost a century has passed since the introduction into the market of gas discharge lamps for general lighting in the form of fluorescent lamps, made possible by the discovery of phosphors able to convert ultra-violet (UV) ...
    • He 1s2s Energies 

      Walker, Thad; Masse, Robert (2014-01-17)
      This Mathematica notebook demonstrates how to calculate fairly accurate He energy levels using undergraduate level quantum mechanics. It is intended to accompany the manuscript "Accurate Binding Energy of the He Atom with ...
    • He 1s^2 Pertubation Theory 

      Masse, Robert; Walker, Thad G (2013-09-02)
      This Mathematica notebook accompanies the paper "Accurate Binding Energy of the He Atom with Undergraduate Quantum Mechanics". The notebook contains the calculations described in that paper.
    • High energy density plasma simulations using ultracold neutral plasmas 

      Bergeson, Scott (2018-04-27)
      Strongly-coupled Coulomb systems are typically fluid-like plasmas characterized by the ratio of the nearest-neighbor electrical potential energy to the average kinetic energy. When this ratio is near unity, the plasmas are ...
    • How I Became a Non-Chemist 

      Menningen, Ken (2018-04-27)
      Some scientists direct their careers with laser focus to answer a small set of questions. Others wander around like a trapped photon. I will tell the story about how a plasma physicist ended up studying combustion chemistry, ...
    • Jim Lawler's Science: Above and Below the H-Line 

      Walker, Thad G. (2018-04-27)
      This presentation gives an overview of Jim Lawler's career, focusing on a few of his important contributions to science.
    • JimFest Overview 

      Walker, Thad; Bergeson, Scott (2018-04-27)
      Overview of the 2018 Wisconsin Atomic Spectroscopy Seminar in honor of Prof. James E. Lawler. Includes biographical information and the scientific program.
    • Measurements of branching fractions using Fourier transform and grating spectroscopy 

      Nave, Gillian (2018-04-30)
      The measurement of lifetimes using laser-induced fluorescence at the University of Wisconsin-Madison has been one of the most productive experiments in the measurement of atomic spectroscopic data. The NIST bibliographic ...
    • Non-Degenerate Four-Wave Mixing through Rydberg States in a MOT 

      Day, Jason; Brekke, Erik; Walker, Thad G. (2007-07-02)
      In this work, we use a three-photon near-resonant process in a laser-cooled Rb vapor to achieve phase-matched four-wave mixing using an intermediate Rydberg state. Rydberg atoms in the 36D5/2 state are efficiently produced ...