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Search Publications by: Jonathan E. Hardis (Fed)

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Displaying 1 - 25 of 26

Time and frequency from electrical power lines

March 6, 2017
Author(s)
Jonathan E. Hardis, Demetrios Matsakis, Blair Fonville
Due to the efforts of Henry Warren, inventor of the Telechron electric clock, electric power companies have been a source of time and frequency reference for the public for over a hundred years. However, advances in technology and changes in the electric

Telling Time

February 19, 2017
Author(s)
Jonathan E. Hardis
In Low-Tech Blues [June], you note that we are surrounded by clocks, but lament the lack of systems to set them automatically. Our job is to help fix that. Your readers can use our time servers (www. Bldrdoc.gov/timefreq/service/its.htm) to automatically

Study of CeI 3 evaporation in the presence of Group 13 metal-iodides

January 17, 2014
Author(s)
John J. Curry, Albert Henins, E. G. Estupinan, S. D. Shastri, Jonathan E. Hardis, W. P. Lapatovich
The influence of GaI$_3$, InI, and TlI on the evaporation characteristics of CeI$_3$ have been studied over the temperature range 900 K to 1400 K using x-ray induced fluorescence. The total vapor densities, summed over all atomic and molecular species, of

Enhancement of lanthanide evaporation by complexation: DyI3/InI and TmI3/TlI

September 30, 2013
Author(s)
John J. Curry, Albert Henins, Jonathan E. Hardis, E. G. Estupinan, W. P. Lapatovich, S. D. Shastri
The vapors in equilibrium with condensates of DyI$_3$, DyI$_3$/InI, TmI$_3$, and TmI$_3$/TlI have been observed over the temperature range 900 K to 1400 K using x-ray induced fluorescence. The total densities of each element (Dy, Tm, In, Tl, and I) in the

Physics Laboratory: Activities, Accomplishments & Recognition 2008-2009

March 1, 2010
Author(s)
Jonathan E. Hardis
This report summarizes the research and measurement science carried out during 2008-2009 in the NIST Physics Laboratory. The Laboratory supports U.S. industry, government, and the scientific community by providing measurement services and research for

Physics Laboratory: 2002 Activities, Accomplishments and Recognition

February 1, 2003
Author(s)
Jonathan E. Hardis, William R. Ott, G G. Wiersma
This report summarizes the research and measurement science carried out during calendar year 2001 in the NIST Physics Laboratory. The Laboratory supports U.S. industry, government, and the scientific community by providing measurement services and research

100 Years of Photometry and Radiometry Harnessing Light

June 1, 2001
Author(s)
Jonathan E. Hardis
Measurement of light is an old subject, though the past 100 years have seen significant advances. 100 years ago, photometry the art and science of measuring light as it is preceived by people had the greatest technological importance. Even today, SI (the

Valence-Shell Autoionization of NO

June 1, 2000
Author(s)
S H. Southworth, T A. Ferrett, Jonathan E. Hardis, Albert C. Parr, J L. Dehmer
Autoionization of valence and Rydberg states in NO over the 12.5-18 eV photon energy range was studied by vibrationally resolved photoelectron spectroscopy of the 2π orbital. Complex, oscillatory structure is observed in NO + (2Π -1) X 1ς + partial cross