Now showing items 1-10 of 15
A Fresh Look at Abundances of Iron-group Elements in Very Metal-Poor Stars
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. ...
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
Explanation of double photoionization experiments
From nonlocal electrons to delocalized electrons and artificial atoms
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, ...
The astrophysical r-process: what we are learning from gravitational waves, dwarf galaxies, and stellar archaeology
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 ...
Measurements of branching fractions using Fourier transform and grating spectroscopy
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 ...
Downstream hydrogen plasma cleaning for mass metrology at NIST
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, ...
Gas Discharge Lamps – A Requiem
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) ...
Spectroscopic study of the 7p J=1/2 and 7p J=3/2 states in neutral cesium-133
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. ...
UW Laboratory Astrophysics
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 ...