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Author: Edwin Heilweil

Displaying records 1 to 10 of 84 records.
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1. Ultrafast THz photoconductivity of photovoltaic polymer-fullerene blends: a comparative study correlated with photovoltaic device performance
Published: 10/10/2014
Authors: Edwin J Heilweil, Jin Zuanming, Dominik Gehrig, Clare Dyer-Smith, Frederic Laquai, Mischa Bonn, Dmitry Turchinovich
Abstract: Ultrafast photo-induced carrier dynamics in prototypical low band-gap polymer:fullerene photovoltaic blend films PTB7:PC70BM and P3HT:PC70BM is investigated using ultrafast terahertz (THz) spectroscopy. The sub-picosecond (ps) and few-ps decays of TH ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917297

2. Time-Resolved Infrared Studies of a Trimethylphosphine Model Derivative of [FeFe]-Hydrogenase
Published: 10/1/2013
Authors: Edwin J Heilweil, Christopher Jon Stromberg, Melissa Johnson, James Thuman, Roger G. Letterman, Webster Edwin Charles
Abstract: Model compounds that structurally mimic the hydrogen-producing active site of [FeFe] hydrogenases have been explored. In order to explore potential ground-state electronic structure effects on reaction mechanisms compared to hexacarbonyl derivatives, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914239

3. Application of nanoporous silicon substrates for terahertz spectroscopy
Published: 12/20/2012
Authors: Edwin J Heilweil, Shu-Zee A. Lo, Gagan Kumar, Thomas E. Murphy
Abstract: Infrared spectroscopy is a valuable tool for probing and characterizing the macro-molecular motions of complex molecules, including vibrational and phonon modes that cannot be easily accessed through visible spectroscopy. We describe here an impro ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912179

4. Spectra and Relaxation Dynamics of the Pseudohalide (PS) Vibrational Bands for Ru(bpy)2(PS)2 Complexes, PS = CN, NCS and N3
Published: 12/5/2012
Authors: Edwin J Heilweil, Ryan Compton, Helen K. Gerardi, Daniel Weidinger, Douglas J. Brown, Walter J. Dressick, Jeffrey C. Owrutsky
Abstract: The RuII cyclometalated dye complex, cis-Ru(bpy)2(N3)2 (where bpy = 2,2‰-bipyridine), along with two more familiar analogs with pseudohalide (PS) ligands, cis-Ru(bpy)2(NCS)2 and cis-Ru(bpy)2(CN)2, were investigated in solution with static and transi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912642

5. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912644

6. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909327

7. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908544

8. 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

9. 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

10. 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



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