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Author: Edwin Heilweil

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1. Pulsed terahertz bi-directional reflection distribution function (BRDF) measurements of materials and obscurants
Published: 6/13/2011
Authors: Shu Zee Alencious 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

2. 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

3. 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

4. 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

5. 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

6. Terahertz spectroscopy of aqueous L-Proline in reverse micelles
Published: 11/21/2008
Authors: Catherine C Cooksey, Edwin J Heilweil, Benjamin Greer
Abstract: A new method for obtaining room temperature terahertz (THz) absorption spectra of aqueous-phase biomolecules in the frequency range 1 THz to 21 THz (35 cm-1 to 700 cm-1) is reported. The spectrum for L-Proline was acquired by solvating the amino ac ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842526

7. Terahertz Spectroscopy of Biomolecules
Published: 12/22/2007
Authors: David F Plusquellic, Edwin J Heilweil
Abstract: Far-infrared (Terahertz or THz) spectroscopic investigations of condensed-phase biological and model organic species including substituted benzenes, amino acids, sugars, polypeptides, small proteins and DNA/RNA are reviewed. These studies reveal tha ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841090

8. Ultrafast Dynamics of Model Molecular Photoswitches in Solid Phase
Published: 12/18/2007
Authors: Tung T. To, Edwin J Heilweil
Abstract: Ultraviolet pump, infrared probe transient absorption studies of the chelatable compound 1, [Mn{?5-C5H4C(O)(SCH3)3}(CO)3], dispersed in room temperature, ~25 m thick polyacryclonitrile (PAN) films are reported for the first time. Irradiation of 1 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841099

9. Ultrafast Chelation Dynamics of a Manganese Tricarbonyl Derivative in Solid Polyacrylonitrile
Published: 7/31/2007
Authors: T To Tung, Edwin J Heilweil
Abstract: Ultraviolet pump, infrared probe transient absorption studies of the chelatable compound 1, [Mn{?5-C5H4C(O)(SCH3)3}(CO)3], dispersed in room temperature, ~25 m thick CaF2 supported, spin-coated polyacryclonitrile (PAN) films are reported for the fir ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841088

10. Ultrafast Chelation Dynamics of Model Photoswitches: Arene Chromium Tricarbonyl Derivatives With Pendant Sulfides
Published: 5/25/2007
Authors: Tung T. To, Charles Duke, T J Burkey, Edwin J Heilweil
Abstract: The chelation dynamics of three new [Cr{?6-C6H5C(O)R}(CO)3] complexes 1 (R = CH2(SCH3)), 2 (R = CH(SCH3)2), and 3 (R = C(SCH3)3) in room temperature heptane, THF, and acetonitrile solutions have been investigated on the picosecond to millisecond time ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841098



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