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You searched on: Author: edwin heilweil

Displaying records 11 to 20 of 93 records.
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11. Pulse Terahertz Reflection/Scattering Measurement
Published: 9/7/2011
Authors: Shu Zee A. Lo, Edwin J Heilweil
Abstract: We report a method to measure reflection and scattering from several samples with different degrees of surface roughness and material properties at terahertz frequencies. Reflection from a flat gold mirror shows that the full width half maximum (FWHM ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909108

12. Pulsed terahertz bi-directional reflection distribution function (BRDF) measurements of materials and obscurants
Published: 6/13/2011
Authors: Shu Zee A. Lo, David R Novotny, Erich N Grossman, Edwin J Heilweil
Abstract: A pulsed terahertz imaging system modified to perform angular detection of light for quantitatively characterizing reflection and scattering from samples is reported. Reflection from a gold mirror shows that the full width half maximum (FWHM) of the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908320

13. Terahertz, Infrared and Raman Vibrational Assignments of [FeFe]-Hydrogenase Model Compounds
Published: 3/3/2011
Authors: Christopher Jon Stromberg, Edwin J Heilweil
Abstract: Using Raman, Terahertz (THz), and mid-Infrared (IR) spectroscopies, the vibrational spectra of two chromophore models of hydrogen-producing [FeFe]-hydrogenase, Fe2(μ-S2C3H6)(CO)6 and Fe2(μ-S2C2H4)(CO)6, have been assigned. The combination ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905677

14. Ultrafast Photoinduced Carrier Dynamics of Organic Semiconductors Measured by Time-Resolved Terahertz Spectroscopy
Published: 4/28/2010
Authors: Okan Esenturk, Joseph S Melinger, Paul A. Lane, Edwin J Heilweil
Abstract: Intrinsic properties of organic semiconductors are investigated by Time-Resolved Terahertz Spectroscopy (TRTS) to assess their relative mobilities and efficiencies. Our results are well correlated with device measurements, and show the effectiveness ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902516

15. In-situ Kinetics Studies on Hydrogenation of Transition Metal (=Ti, Fe) Doped Mg Films
Published: 3/1/2010
Authors: Zhuopeng Tan, Edwin J Heilweil, Leonid A Bendersky
Abstract: In this paper we report on kinetics studies on growth rates of a hydride phase during metal-hydride phase transformation of Mg films doped with transition metals (=Ti, Fe). Infrared imaging of wedge-shaped thin films during hydrogen loading reveals d ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904735

16. Ultrafast Terahertz Spectroscopy for Measuring Carrier Dynamics in Nanoscale Photovoltaic Materials
Published: 2/15/2010
Authors: Okan Esenturk, Paul A. Lane, Joseph S Melinger, Edwin J Heilweil
Abstract: Femtosecond pump-probe methods are useful tools for investigating transient electronic and vibrational states of conducting materials and molecular photochemistry. Ultraviolet and visible excitation pulses (<150 fs, <20 mJ, 266-800 nm) with time-del ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904838

17. Relative Photon-to-Carrier Efficiencies of Alternating Nanolayers of Zinc Phthalocyanine and C60 Multilayer Films Assessed by Time-Resolved Terahertz Spectroscopy
Published: 10/1/2009
Authors: Okan Esenturk, Joseph S Melinger, Paul A. Lane, Edwin J Heilweil
Abstract: Alternating multi-layer and 1:1 blended films of zinc phthalocyanine (ZnPc)and buckminsterfullerene (C60) were investigated as model active layers for solar cells by Time-Resolved Terahertz Spectroscopy (TRTS). Relative photon-to-carrier efficiencies ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902140

18. An infrared imaging high-throughput combinatorial method for investigating new phase formation and hydrogen storage capacities of thin films
Published: 7/15/2009
Authors: Jason Hattrick-Simpers, Leonid A Bendersky, Edwin J Heilweil, H. Oguchi, Ichiro Takeuchi
Abstract: We have refined and expanded on the capabilities of rapid screening, which utilizes infrared (IR) emissivity imaging. A complete procedure for using infrared emissivity to characterize the hydrogen storage properties of thin-film samples is describ ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901373

19. Characterization of Metal-Oxide Nanofilm Morphologies and Composition by Terahertz Transmission Spectroscopy
Published: 3/30/2009
Authors: Edwin J Heilweil, James E Maslar, William Andrew Kimes, Nabil Bassim, Peter K. Schenck
Abstract: An all-optical terahertz absorption technique for non-destructive characterization of nanometer-scale metal-oxide thin films grown on silicon substrates is described. Example measurements of laser and atomic layer-deposited films of HfO2, TiO3, Al2O ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842590

20. Development of Ultrafast Photochromic Organometallics and Photoinduced Linkage Isomerization of Arene Chromium Carbonyl Derivatives
Published: 2/20/2009
Authors: Tung T. To, Edwin J Heilweil, Duke Charles, Ruddick Kristie, Webster Edwin Charles, Burkey Theodore
Abstract: We review recent studies of processes relevant to photoinduced linkage isomerization of organometallic systems with the goal of preparing organometallics with an efficient and ultrafast photochromic response. The organometallic system thus corr ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841065



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