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Author: David Plusquellic

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1. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909800

2. THz Spectroscopic Study of Rust Layer on Aged Steel-Reinforced Structural Components
Published: 9/26/2011
Authors: David F Plusquellic, Virgil Provenzano, Shin G. Chou
Abstract: In this study, we use THz-based spectroscopy as a non-destructive diagnostic tool to characterize the corrosion by-products (rust) on aged iron structural components. Even though previous Mossbauer spectroscopic findings suggested the presence of an ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907023

3. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907835

4. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907455

5. Far Infrared Absorption Measurements of Single Walled Carbon Nanotubes
Published: 1/17/2011
Authors: Shin G. Chou, Zeeshan Ahmed, Georgy Samsonidze, Jing Kong, Mildred Dresselhaus, David F Plusquellic
Abstract: Variable temperature high resolution far infrared absorption measurements were carried out for single walled carbon nanotubes samples with different diameter distributions. At a temperature where kBT is significantly lower than the phonon energy, th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906962

6. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906135

7. Distinguishing Tunneling Pathways For Two Chiral Conformer Pairs Of 1,3-Propanediol From The Microwave Spectrum
Published: 11/19/2009
Authors: Francis John Lovas, David F Plusquellic, Brooks H Pate, Justin L. Neill, Matt T. Muckle, Anthony J. Remijan
Abstract: Using both a cavity and a broadband microwave spectrometers, the microwave spectrum of the sugar alcohol 1,3-propanediol (CH2OHCH2CH2OH) has been measured over the frequency range 6.7 GHz to 25.4 GHz. Two conformers of 1,3-propanediol have been assi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902614

8. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902388

9. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901215

10. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842523



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