Now showing items 1-20 of 31

    • Small Angle X-ray Scattering from Protein Solutions 

      Rothwell, William S. (1954-01-14)
    • RayTrace 

      Walker, Thad G. (1998-03-13)
      This applet traces paraxial light rays through a user-specified system of up to 12 ideal thin lenses and apertures, allowing many simple optical instruments to be modelled. Three examples are given: coupling of light from ...
    • A Portable Ultrasensitive SERF Atomic Magnetometer for Biomagnetic Measurements 

      Wyllie, Robert; Li, Zhimin; Cook, Peter; Wakai, Ronald T.; Walker, Thad G. (2007-07-02)
      We present a portable Rb cell atomic magnetometer suited for biomagnetic measurements. Working in the spin-exchange relaxation free regime, we demonstrate an initial white noise floor of 60 fT/sqrt {Hz}. We show an adult ...
    • 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 ...
    • 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 ...
    • 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
    • Physics Challenges for Spin-Exchange Optical Pumping of He-3 

      Walker, Thad G. (2009-05-28)
      Presentation given at the "Physics and Applications of Polarized Noble Gases" workshop at the University of Virginia, May 19, 2009.
    • A Portable Ultrasensitive SERF Atomic Magnetometer for Biomagnetic Measurements 

      Proite, Nicholas; Cook, Peter; Li, Zhimin; Wakai, Ronald T.; Walker, Thad G.; Wyllie, Robert (2009-09-10)
      We present a portable Rb cell atomic magnetometer suited for biomagnetic measurements. Working in the spin-exchange relaxation free regime, we demonstrate an initial white noise floor of 60 fT$/\sqrt {Hz} $. We show an ...
    • A Portable SERF Magnetometer for Biomagnetic Measurements 

      Wyllie, Robert (2009-09-10)
      Recent developments on the UW SERF magnetometer.
    • Ultrasensitive Atomic Magnetometers 

      Wyllie, Robert; Wakai, Ronald T.; Walker, Thad G. (2009-09-10)
      We have developed a novel, small-volume portable single-channel atomic biomagnetometer and have used it to detect adult MCG signals. The cryogenic-free magnetometer has sufficiently high sensitivity (20 fT/rt(Hz)) that ...
    • 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. ...
    • 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.
    • 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.
    • 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.
    • 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 ...
    • Transition Probabilities for Neutral Cerium from Boltzmann Analysis of Fourier Transform Spectra 

      Nitz, David (2018-04-27)
      Poster presentation on Cerium transition probabilities
    • 2+ Ion Concentration and the Double Photoionization of Aromatic Organic Molecules 

      Huber, David (2018-04-27)
      Explanation of double photoionization experiments
    • 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.
    • 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) ...