X-ray spectroscopy of ion-surface interactions using superconducting tunnel junctions (open access)

X-ray spectroscopy of ion-surface interactions using superconducting tunnel junctions

We have conducted low energy X-ray spectroscopy of ion/surface interactions with superconducting tunnel junction (STJ) detectors. The STJ detectors (Nb-Al-AlOx-Al-Nb) developed at the Lawrence Livermore National Laboratory have a high energy resolution and a high count-rate capability. The detectors are operated in an adiabatic demagnetization refrigerator with 60 mK base temperature at the end of a 40 cm long cold finger, which can be inserted into a UHV sample chamber connected to an ion source. We have studied the interaction of Ar{sup 9+}, O{sup 7+}, N{sup 6+} and C{sup 5+} with various targets (Au, SiH and SiO{sub 2}) at a kinetic energy of 10 keV/q. The resolution of 12-15 eV below 1 keV allows the different satellite lines emitted by these ions to be separated.
Date: July 21, 2001
Creator: Niedermayr, Thomas; Friedrich, Stephan; Cunningham, Mark F.; Frank, Matthias; Briand, Jean-Pierre & Labov, Simon E.
Object Type: Article
System: The UNT Digital Library
Charitable Choice Provisions of H.R. 7 (open access)

Charitable Choice Provisions of H.R. 7

H.R. 7, the Community Solutions Act, on July 19 won House passage without amendment by a vote of 233-198. The bill includes basic elements of President Bush’s faith-based initiatives: tax incentives for private giving–scaled back from original proposals (Title I)–and expansion of charitable choice (Title II). (Title III deals with individual development accounts.)
Date: July 21, 2001
Creator: Burke, Vee
Object Type: Report
System: The UNT Digital Library