U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications by: James(Trey) Porto (Fed)

Search Title, Abstract, Conference, Citation, Keyword or Author
Displaying 126 - 149 of 149

Direct Imaging of Highly Charged Ions in an Electron Beam Ion Trap

August 1, 2000
Author(s)
James V. Porto, I Kink, John D. Gillaspy
We have directly observed the ion cloud distribution in an electron beam ion trap using visible and ultraviolet fluorescence from lines in the ground term of Ar 13+,^ Xe 31+ and Xe 32+ ions. Using a gated intensified charge coupled device camera, we have

UV Light From the Ground Term of Ti-Like Ytterbium, Tungsten, and Bismuth

May 1, 2000
Author(s)
James V. Porto, John D. Gillaspy
We have used an electron beam ion trap (EBIT) to measure the wavelength of the J=2 to j=3 magnetic dipole transition in the 3d 4 ground term of Ti-like Ytterbium and Tungsten. These results extend the range of measurements of this line along the

Laboratory Astrophysics and Microanalysis With NTD-Germanium-Based X-Ray Microcalorimeters

January 1, 2000
Author(s)
E Silver, H. Schnopper, Simon R. Bandler, S Murray, N. Madden, D Landis, J. Beeman, E. E. Haller, M Barbera, G Tucker, John D. Gillaspy, E Takacs, James V. Porto
With the ability to create cosmic plasma conditions in the laboratory it is possible to investigate the dependencies of key diagnostic x-ray lines on density, temperature, and excitation conditions that exist in astrophysical sources with x-ray optics and