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Displaying 301 - 325 of 329

Microcalorimeter EDS Measurements of Chemical Shifts in Fe Compounds

July 1, 1998
Author(s)
David A. Wollman, Dale E. Newbury, Gene C. Hilton, Kent D. Irwin, L L. Dulcie, Norman F. Bergren, John M. Martinis
Chemical shifts result from changes in electron binding energies with the chemical environment of atoms. In x-ray spectra, chemical shifts lead to changes in x-ray peak positions, relative peak intensities, and peak shapes. These chemical bonding effects

Thermal-Response Time of Superconducting Transition-Edge Microcalorimeters

April 1, 1998
Author(s)
Kent D. Irwin, Gene C. Hilton, David A. Wollman, John M. Martinis
We investigate limits on the thermal-response time of supercondcuting transition-edge microcalorimeters. For operation at 0.1 K, we show that the lower limit on the response time of a superconducting transition-edge microcalorimeter is of order 1 5m due to

DC SQUID Series Arrays with Intracoil Damping to Reduce Resonance Distortions

December 31, 1997
Author(s)
Martin Huber, A. M. Corey, K. L. Lumpkins, F. N. Nafe, J. Rantschler, Gene C. Hilton, John M. Martinis, A. H. Steinbach
We report on low-noise DC SQUID series arrays incorporating intracoil damping, which show smooth DC characteristics. The voltage-flux characteristics of these devices are reproducible upon repeated cooling and do not require multiple heating/cooling cycles

High-Resolution, Energy-Dispersive Microcalorimeter Spectrometer for X-Ray Microanalysis

December 1, 1997
Author(s)
David A. Wollman, Kent D. Irwin, Gene C. Hilton, L L. Dulcie, Dale E. Newbury, John M. Martinis
We have developed a prototype X‐ray microcalorimeter spectrometer with high energy resolution for use in X‐ray microanalysis. The microcalorimeter spectrometer system consists of a superconducting transition‐edge sensor X‐ray microcalorimeter cooled to an

Superconducting Microcalorimeter X-ray Spectrometers

June 1, 1997
Author(s)
John M. Martinis, David A. Wollman, Kent D. Irwin, Gene C. Hilton
A revolutionary advance in x-ray microanalysis will occur in the next few years due to the development of new x-ray spectrometers based on microcalorimeters. These detectors will be similar in operation to commonly-used energy dispersive spectrometers (EDS