Department of Physics, UW-Madison
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UW Atom Trainers
Materials from the research group of Professor Thad G. Walker
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Advances in Fetal Magnetocardiography Using SERF Atomic Magnetometers
(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. -
Downstream hydrogen plasma cleaning for mass metrology at NIST
(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, ... -
Measurements of branching fractions using Fourier transform and grating spectroscopy
(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 ... -
High energy density plasma simulations using ultracold neutral plasmas
(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 ... -
UW Laboratory Astrophysics
(2018-04-27)In this talk I will describe the laboratory astrophysics program of the Jim Lawler group at the University of Wisconsin – Madison, focusing on the laboratory techniques and instruments used for the measurement of transition ... -
Spectroscopic study of the 7p J=1/2 and 7p J=3/2 states in neutral cesium-133
(2018-04-27)I will start with a few observations of connections between spectroscopy and other (seemingly unrelated) research topics, then focus on Doppler free spectroscopy on the 7p J=1/2 and 7p J=3/2 states in neutral cesium-133. ... -
A Fresh Look at Abundances of Iron-group Elements in Very Metal-Poor Stars
(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. ... -
The astrophysical r-process: what we are learning from gravitational waves, dwarf galaxies, and stellar archaeology
(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 ... -
Six Lines to Tell a Story
(2018-04-27)In this talk, I will highlight a recently completed investigation into a challenge brought against our earlier work on vanadium. The discrepancy between six transition probabilities and its resolution touches on several ... -
From nonlocal electrons to delocalized electrons and artificial atoms
(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, ... -
How I Became a Non-Chemist
(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
(2018-04-27)This presentation gives an overview of Jim Lawler's career, focusing on a few of his important contributions to science. -
Gas Discharge Lamps – A Requiem
(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) ... -
JimFest Overview
(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. -
2+ Ion Concentration and the Double Photoionization of Aromatic Organic Molecules
(2018-04-27)Explanation of double photoionization experiments -
Transition Probabilities for Neutral Cerium from Boltzmann Analysis of Fourier Transform Spectra
(2018-04-27)Poster presentation on Cerium transition probabilities -
Small Angle X-ray Scattering from Protein Solutions
(1954-01-14) -
He 1s2s Energies
(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 ... -
Atomic Fock State Preparation Using Rydberg Blockade: Supplementary Material
(2013-10-25)Supplementary material describing calibration and measurement of mean atom numbers in small atomic ensembles. -
He 1s^2 Pertubation Theory
(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.