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You searched on: Author: Charles Clark

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1. Pioneering use of Synchrotron Radiation Research as a spectroscopic and metrological tool at NBS
Published: 8/14/2015
Authors: Charles S Tarrio, Keith Codling, Ederer David, Uwe Arp, Charles W Clark, Thomas B Lucatorto
Abstract: Interest in the use of Synchrotron Radiation (SR) as a source of continuum in the extreme ultraviolet (EUV) spectral region was stimulated by the 1956 Physical Review article by Diran Tomboulian and Paul Hartman of Cornell University. In their all-t ...

2. Noble Gas Excimer Scintillation Following Neutron Capture in Boron Thin Films
Published: 4/11/2014
Authors: Alan K Thompson, Jacob McComb, Charles W Clark, Michael A. Coplan, Mohamad Al-Sheikhly, Robert Edward Vest
Abstract: Far-ultraviolet (FUV) scintillation signals have been measured in heavy noble gases (argon, krypton, xenon) following boron-neutron capture (10B(n,α)7Li) in 10B thin films. The observed scintillation yields are comparable to the yields from some ...

3. Light-Wave Mixing in Quantum Gases
Published: 5/1/2013
Authors: Lu Deng, Edward W Hagley, R Q. Wang, Charles W Clark
Abstract: Ninety-five years after Einstein‰s theoretical prediction, we are surrounded in our daily lives by its practical applications. For example, multi-channel telecommunication lasers and even the commonly-used green laser pointers that cost just a fe ...

4. Overview of the TREC 2011 Web Track
Series: OTHER
Published: 11/15/2011
Authors: Ian M Soboroff, Nick Craswell, Charles L. Clarke, Gordon Cormack
Abstract: The TREC Web Track explores and evaluates Web retrieval technology over large collections of Web data. In its current incarnation, the Web Track has been active for two years. For TREC 2010, the track includes three tasks: 1) an adhoc retrieval t ...

5. SURF III: A flexible Synchrotron Radiation Source for Radiometry and Research
Published: 9/1/2011
Authors: Uwe Arp, Charles W Clark, Lu Deng, Nadir S. Faradzhev, Alex P. Farrell, Mitchell L. Furst, Steven E Grantham, Edward W Hagley, Shannon Bradley Hill, Thomas B Lucatorto, Ping-Shine Shaw, Charles S Tarrio, Robert Edward Vest
Abstract: The calculability of synchrotron radiation (SR) makes electron storage rings wonderful light sources for radiometry. The broadband nature of SR allows coverage of the whole spectral region from the x-ray to the far-infrared. Compact low-energy storag ...

6. A Special Functions Handbook for the Digital Age
Published: 8/1/2011
Authors: Ronald F Boisvert, Charles W Clark, Daniel W Lozier, Frank William John Olver
Abstract: The NIST Digital Library of Mathematical Functions (DLMF) is a reference work providing information on the properties of the special functions of applied mathematics. It is a successor to the highly successful NBS Handbook of Mathematical Functions ( ...

7. A Comparative Analysis of Cascade Measures for Novelty and Diversity
Published: 2/10/2011
Authors: Ian M Soboroff, Charles L. Clarke, Nick Craswell, Azin Ashkan
Abstract: Traditional editorial effectiveness measures, such as nDCG, remain standard for Web search evaluation. Unfortunately, these traditional measures can inappropriately reward re- dundant information and can fail to reflect the broad range of user needs ...

8. Far-ultraviolet signatures of the 3He(n,tp) reaction in noble gas mixtures
Published: 12/8/2010
Authors: Patrick Hughes, Alan K Thompson, Michael Coplan, Robert Edward Vest, Charles W Clark
Abstract: Previous work showed that the 3He(n,tp) reaction in a cell of 3He at atmospheric pressure generated tens of far-ultraviolet photons per reacted neutron. Here we report amplification of that signal by factors of 1000 and more when noble gases are adde ...

9. A Green Laser Pointer Hazard
Series: Technical Note (NIST TN)
Report Number: 1668
Published: 8/2/2010
Authors: Jemellie Galang, Alessandro Restelli, Edward W Hagley, Charles W Clark
Abstract: An inexpensive green laser pointer was found to emit 20 mW of infrared radiation during normal use. This is potentially a serious hazard that would not be noticed by most users of such pointers. We find that the problem derives from an unsafe desig ...

10. Ettore Majorana and the birth of autoionization
Published: 7/2/2010
Authors: Charles W Clark, Ennio Arimondo, William C. Martin
Abstract: In the early days of theoretical atomic spectroscopy, Ettore Majorana (1906-1938?) solved several outstanding problems by developing the theory of autoionization. Later literature makes only sporadic references to this accomplishment. Reviewing ...

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