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1. Time-resolved terahertz spectroscopy (TRTS) of electrically conductive metal-organic frameworks (MOFs) doped with redox active species
Published: 9/24/2015
Authors: Brian G Alberding, Edwin J Heilweil
Abstract: Metal-Organic Frameworks (MOFs) are three-dimensional coordination polymers that are well known for large pore surface area and their ability to adsorb molecules from both the gaseous and solution phases. In general, MOFs are electrically insulating, ...

2. 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 ...

3. 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 ...

4. 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 ...

5. 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 ...

6. 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 ...

7. 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, ...

8. 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 ...

9. 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 ...

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 ...

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