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You searched on: Author: david plusquellic

Displaying records 11 to 20 of 104 records.
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11. High Resolution THz Optical Absorption Study of Antiferromagnetic Magnons in Hematite (alpha-Fe2O3)
Published: 7/9/2012
Authors: Shin G. Chou, David F Plusquellic, Paul E Stutzman, Shuangzhen S. Wang, Edward Joseph Garboczi
Abstract: We report the high resolution optical measurement for the temperature dependence of the antiferromagnetic resonance (AFMR) transition in alpha-Fe2O3 between (0.5 and 10)cm-1. We found that below the Morin transition temperature when the spins are pe ...

12. Spectroscopic Characterization of Structural Isomers of Naphthalene: 1-Phenyl-1-butyn-3-ene
Published: 12/15/2011
Authors: Joshua Sebree, David F Plusquellic, Timothy Zwier
Abstract: With the growing interest in the role naphthalene may play in planetary atmospheres and the interstellar medium, it is important to characterize other C10H8 structural isomers. These C10H8 isomers, once formed, may undergo an isomerization reaction t ...

13. Construction of a High Power OPO Laser system for Differential Absorption LIDAR
Published: 9/13/2011
Authors: Kevin O Douglass, Stephen E Maxwell, David F Plusquellic, Joseph Terence Hodges, Roger D van Zee, Daniel Victor Samarov, James R Whetstone
Abstract: Our goal is to develop and characterize optical measurement technology to enable accurate quantification of greenhouse-gas emissions to meet the needs of industry and regulators. A 1064 nm pumped high energy optical parametric oscillator (OPO) opera ...

14. On the electronic excited state dynamics of vibronic transitions. High resolution electronic spectra of acenaphthene and its argon van der Waals complex in the gas phase.
Published: 9/1/2011
Authors: Leonardo Avarez-Valtierra, David F Plusquellic, John T Yi, David W Pratt
Abstract: Rotationally resolved fluorescence excitation spectroscopy has been used to study the dynamics, electronic distribution, and the relative orientation of the transition moment vector in several vibronic transitions of acenaphthene (ACN) and in its Ar ...

15. Rotationally Resolved C2 Symmetric Conformers of Bis-(4-hydroxyphenyl)methane: Textbook Examples of Excitonic Coupling in the S1 and S2 Electronic States
Published: 9/1/2011
Authors: Shin G. Chou, Chirantha P. Rodrigo, Christian Muller, Kevin O Douglass, Timothy Zwier, David F Plusquellic
Abstract: Rotationally resolved microwave and ultraviolet spectra of jet-cooled bis-4 hydroxy)-diphenylmethane (b4HBM) have been obtained using Fourier-transform microwave and UV laser/molecular beam spectrometers. A recent vibronic level study of b4HPM1 has ...

16. 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 ...

17. 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 ...

18. 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 ...

19. 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 ...

20. 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 ...

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