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Search Publications by: David A. Wollman (Fed)

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Displaying 126 - 150 of 150

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

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