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You searched on: Author: david plusquellic

Displaying records 11 to 20 of 98 records.
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11. State Resolved THz Spectroscopy and Dynamics of Crystalline Peptide/Water Systems
Published: 7/11/2011
Authors: Zeeshan Ahmed, Shin G. Chou, Karen M. Siegrist, David F Plusquellic
Abstract: State resolved THz studies of crystalline peptides and their hydrates have provided precise measures of the infrared active phonon modes that reflect motions on the longest possible length scales in these systems. The impact of co-crystallized water ...

12. Conformer-specific vibronic spectroscopy and vibronic coupling in a flexible bichromophore: bis-(4-hydroxyphenyl)methane
Published: 4/28/2011
Authors: Chirantha P. Rodrigo, Christian Muller, Nathan Pillsbury, William H. James III, David F Plusquellic, Timothy Zwier
Abstract: The vibronic spectroscopy of jet-cooled bis-(4-hydroxyphenyl)methane (b4HPM) has been explored using fluorescence excitation (FE), dispersed fluorescence (DFL), UV-UV holeburning (UVHB), UV depletion (UVD), and fluorescence-dip infrared (FDIR) spectr ...

13. Chirped-pulse terahertz spectroscopy for broadband trace gas sensing
Published: 4/22/2011
Authors: Eyal Gerecht, Kevin O Douglass, David F Plusquellic
Abstract: We report the first demonstration of a broadband trace gas sensor based on chirp-pulse terahertz spectroscopy. The advent of newly developed solid state sources and heterodyne detectors for the terahertz frequency range have made it possible to gener ...

14. Organic Compounds in the C3H6O3 Family: Microwave Spectrum of cis-cis-Dimethyl Carbonate
Published: 10/18/2010
Authors: Francis John Lovas, David F Plusquellic, Susanna L. Widicus Weaver, B. A. McGuire, G. A. Blake
Abstract: Geometry optimization calculations on 13 members of the C3H6O3 family of organic species have been carried out to determine their relative binding energies. Dimethyl carbonate [(CH3)2CO3] is one of the lower energy species in this family, which inclu ...

15. 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 ...

16. 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 ...

17. 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 ...

18. 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 ...

19. 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 ...

20. 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 ...

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