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You searched on: Author: Edwin Heilweil

Displaying records 1 to 10 of 98 records.
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1. Direct Observation of Carrier Cooling in Organic Semiconductors
Published: 7/16/2015
Authors: Edwin J Heilweil, Paul A. Lane, Paul D. Cunningham, Joseph S Melinger
Abstract: Photocurrent in an organic solar cell is generated by a charge transfer reaction between the electron donor and acceptor. The effect of excess excitation energy and the relative contributions of electron and hole transfer are the subject of intense s ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915845

2. Linkage Isomerization via Geminate Cage or Biomolecular Mechanisms: Time-Resolved Investigations of an Organometallic Photochrome
Published: 3/25/2015
Authors: Edwin J Heilweil, Kristy M Dewitt, Tung T To, Theodore Joseph Burkey
Abstract: A metal center reversibly migrates from a pyridinyl group to a nitrile group in the light driven linkage isomerization of dicarbonyl(3-cyanomethylpyridine-N3)(eta-5-methylcyclopentadienyl)-manganese (4) to dicarbonyl(3-cyanomethylpyridine-CN)(eta-5-m ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917249

3. Linkage Isomerization via Germinate Cage or Biomolecular Mechanisms: Time-Resolved Investigations of an Oranometalic Photochrome
Published: 3/25/2015
Author: Edwin J Heilweil
Abstract: The extent of the photoinitiated linkage isomerization of dicarbonyl(3-cyanomethylpyridine-kappa-N3)(eta-5-methylcyclopentadienyl)manganese (4) to dicarbonyl(3-cyanomethylpyridine-kappa-CN)(eta-5-methylcyclopentadienyl)-manganese (5) was examined by ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918091

4. Hot photocarrier dynamics in organic semiconductors studied by ultrafast terahertz photoconductivity and transient absorption spectroscopies
Published: 11/3/2014
Authors: Paul A Lane, Paul D. Cunningham, Joseph S Melinger, Edwin J Heilweil
Abstract: We present a study of charge transfer and carrier dynamics in nano-films of zinc phthalocyanine (ZnPc) and buckmisnster¬fullerene (C60) by investigated by time-resolved terahertz spectroscopy (TRTS). We compare terahertz photocon¬ductivity dynamics i ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916982

5. 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

6. 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

7. 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

8. 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

9. A SMALL-SAMPLE, BI-DIRECTIONAL SCATTERING MEASUREMENT SYSTEM FROM 200-500 GHz
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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911923

10. 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



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