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You searched on: Author: david plusquellic

Displaying records 21 to 30 of 105 records.
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21. International Comparability in Circular Dichroism: II
Published: 10/4/2010
Authors: Curtis W Meuse, Jascindra Ravi, Paulina Rakowska, Tommaso Garfagnini, Alex E. Knight, Philippe Charlet, Julie DeSa Lorenz, Christopher Jones, David F Plusquellic, Frank Wien, Liqing Wu
Abstract: A previous inter-laboratory study, CCQM P59, showed that there was a poor level of comparability between laboratories in circular dichroism spectroscopy. In a follow-up study reported here, we achieved our goal of demonstrating improved comparability ...

22. Infrared and far-infrared characterization of radome materials for accurate determination of microwave permittivity
Published: 5/10/2010
Authors: Karen M. Siegrist, David F Plusquellic, Michael E. Thomas
Abstract: Weak multiphonon bands dominate absorption at the lower absorption band edge which lies in the THz and submillimeter spectral regions for radome materials of interest. The strongly temperature dependent behavior of these bands extends into the microw ...

23. Microwave Spectrum of 1,2-Propanediol
Published: 9/1/2009
Authors: Francis John Lovas, David F Plusquellic, Brooks Pate, Justin L. Neill, Matt T. Muckle, Anthony J. Remijan
Abstract: The microwave spectrum of the sugar alcohol 1,2-propanediol (CH3CHOHCH2OH) has been measured over the frequency range 6.5 GHz to 25.0 GHz with several pulsed-beam Fourier-transform microwave spectrometers. Seven conformers of 1,2-propanediol have be ...

24. Conformational Effects on Excitonic Interactions in a Prototypical H-bonded Bichromophore: Bis(2-hydroxyphenyl)methane
Published: 4/30/2009
Authors: David F Plusquellic, Nathan Pillsbury, Christian Mueller, Timothy Zwier
Abstract: Laser induced fluorescence (LIF), single vibronic level fluorescence, UV holeburning, and fluorescence-dip infrared (FDIR) spectroscopy have been carried out on bis-(2-hydroxyphenyl)methane (2HDPM) in order to characterize the ground and first excite ...

25. Terahertz Spectra and Normal Mode Analysis of the Crystalline VA Class Dipeptide Nanotubes
Published: 12/31/2008
Authors: David F Plusquellic, Weimin Zhang, Karen M. Siegrist, Susan K. Gregurick
Abstract: Terahertz (THz) spectra of the crystalline VA class dipeptide nanotubes were calculated at both the harmonic and Vibrational Self-consistent Field (VSCF) level using the CHARMM22 force field with periodic boundary conditions. Comparison of the calcul ...

26. Rotationally Resolved Studies of the Exciton Coupled S1/S2 Origin Regions of Diphenylmethane and the d12 Isotopologue
Published: 12/9/2008
Authors: David F Plusquellic, Kevin O Douglass, Jaime Stearns, Nathan Pillsbury, Timothy Zwier, Christian Muller
Abstract: Rotationally resolved microwave and ultraviolet spectra of jet-cooled diphenylmethane (DPM) and DPM-d^12 have been obtained in S^d0, S^d1 and S2 electronic states using Fourier-transform microwave and UV laser/molecular beam spectrometers. The S0 and ...

27. Rotationally resolved studies of S0 and the exciton coupled S1 /S2 origin regions of diphenylmethane and the d12 isotopologue
Published: 12/9/2008
Authors: Jaime Stearns, Aloke Das, Talitha Selby, Timothy Zwier, David F Plusquellic
Abstract: Resonant two-photon ionization (R2PI) and dispersed fluorescence (DF) spectroscopy are used to examine the role of torsional motions in the electronic structure of diphenylmethane (DPM) near the exciton split S1 and S2 origins at 266 nm. Three of th ...

28. THz Investigations of Condensed Phase Biomolecular Systems
Published: 10/8/2008
Authors: Kevin O Douglass, Hailiang Zhang, Susan K. Gregurick, Karen M. Siegrist, David F Plusquellic
Abstract: Terahertz (THz) spectroscopic investigations of crystalline dipeptide nanotubes are discussed in the frequency region from 0.6 THz (2 cm-1) to 3 THz (100 cm-1). The THz region provides access to collective modes of biomolecular systems and is theref ...

29. 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 ...

30. Probing the Electronic Structure of Peptide Bonds Using Methyl Groups:Experimental Measures of Resonance Weights
Published: 6/23/2007
Authors: David F Plusquellic, David W Pratt
Abstract: The observed V3 torsional barriers reported for nine methyl groups attached alpha to peptide bond linkages in five gas phase biomimetics are interpreted at the HF/6311++G(d,p) level of theory in terms of the natural bonding orbitals and the natural r ...

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