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You searched on: Author: edwin heilweil

Displaying records 11 to 20 of 100 records.
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Published: 10/26/2012
Authors: David R Novotny, Joshua A Gordon, Edwin J Heilweil, Brian C. Stillwell, Jeffrey R Guerrieri, Erich N Grossman, Shu Zee A. Lo
Abstract: Beginning the fall of 2012, NIST will be providing scattering measurements for other government agencies. We present performance results of a bi-directional scattering measurement system in the 200-500 GHz range. The goal is to provide dense-spectru ...

12. Time-Resolved Terahertz Studies of Carrier Dynamics in P3HT and Zinc-Phthalocyanine/C60 Nanolayered Organic Films
Published: 10/19/2012
Authors: Edwin J Heilweil, Paul A. Lane, Okan Esenturk, Paul D. Cunningham, Joseph S Melinger
Abstract: Relative carrier mobilities in semiconducting organic polymer films measured using non-contact optical pump terahertz (THz) probe spectroscopy will be presented. Transient signal amplitude measurements of photo-injected mobility as a function of pol ...

13. Time-Resolved Vibrational Spectroscopy of [FeFe-Hydrogenase Model Compounds
Published: 5/21/2012
Authors: Edwin J Heilweil, Christopher Jon Stromberg
Abstract: Fe2(μ-S2C3H6)(CO)6 is a model compound found to mimic the active site structure of the [FeFe]-hydrogenases. To observe the time-dependent behavior of this molecule, ultrafast ultraviolet (UV) or visible excitation with infrared (IR) probe measu ...

14. Time-Resolved Infrared Spectroscopy of an [FeFe]-Hydrogenase Model Compound
Published: 3/26/2012
Author: Edwin J Heilweil
Abstract: Naturally occurring hydrogenases catalyze the reaction of H+ to form H2 gas. To develop a hydrogen source that is not reliant on fossil fuels, synthetic [FeFe]-hydrogenase model species are being studied. These compounds have a wing-like structure wi ...

15. Photoexcitation Dynamics in Nanolayered C60-Zinc Phthalocyanine Films
Published: 2/17/2012
Authors: Paul A Lane, Paul D. Cunningham, Joseph S Melinger, J. P. Kushto, Okan Esenturk, Edwin J Heilweil
Abstract: We elucidate charge transfer and photoexcitation dynamics in C60 and zinc phthalocyanine (ZnPc) by transient and continuous wave spectroscopies. We identify an intermolecular charge transfer state of C¬60 by transient absorption and time-resolved THz ...

16. Engineering Organometallic Femtosecond Chemistry: Photochemistry and Dynamics of Ultrafast Chelation of Cyclopentadienylmanganese Tricarbonyl Derivatives with Pendant Benzenecarbonyl and Pyridinecarbonyl Groups
Published: 10/24/2011
Authors: Edwin J Heilweil, Jermaine O. Johnson, Karen L. Mosley, Phillipe P. Lubet, Webster Edwin Charles, T J Burkey
Abstract: A new method was developed to prepare three cyclopentadienyl manganese tricarbonyl derivatives 1, 4, and 5 with different side chains (Mn{ 5-C5H4CH2COR}(CO)3, R = 2- pyridyl 1, phenyl 4, and 4-pyridyl 5). Steady-state UV-vis, FTIR, and NMR studies in ...

17. 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 ...

18. 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 ...

19. 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 ...

20. 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 ...

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