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Author: Shin Chou

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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. Pronounced micro-segregation in a sorbitol water mixture observed through variable temperature neutron scattering
Published: 5/16/2012
Authors: Shin G. Chou, Sheila Khodadadi, Joseph Curtis, Susan T Krueger, Evgenyi Shalaev, Alan Soper, Andy Fitch, T Narayanan, Michael Szutucki, Marcus T Cicerone
Abstract: In this study, we use small and wide angle X-ray and neutron scattering measurements, to study the structure of concentrated sorbitol solutions and glasses at different temperatures. The analysis of the data suggests the water forms clusters with a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909101

3. Pronounced Microheterogeneity in a Sorbitol-Water Mixture Observed through Variable Temperature Neutron Scattering
Published: 3/26/2012
Authors: Shin G. Chou, Alan K. Soper, Sheila Khodadadi, Joseph Curtis, Susan T Krueger, Marcus T Cicerone, Andrew N. Fitch, Evgenyi Y. Shalaev
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911833

4. 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

5. 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

6. 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

7. 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

8. Monitoring Photothermally Excited Nanoparticles via Multimodal Microscopy
Published: 5/19/2010
Authors: Matthew Lawrence Clarke, Shin G. Chou, Jeeseong Hwang
Abstract: Generation of heat using optically excited nanoparticles can be beneficial or detrimental depending on the application. Therefore, clinically applicable studies are being pursued in an effort to achieve safe practices of nanoparticle-induced hyperth ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905276

9. Effects of Plasmon-Exciton Coupling on the Optical Properties of CdSe/Zns Quantum Dots Coupled to Gold Nanoparticles
Published: 1/25/2010
Authors: Shin G. Chou, Hyeong Gon Kang, Matthew Lawrence Clarke, Jeeseong Hwang
Abstract: By using a multi-color, multi-modal imaging platform, we look into the effects of exciton-plasmon coupling on a semiconductor quantum dot (QD) that is coupled to a nearby gold nanoparticles (AuNP). By exciting this coupled material with laser excita ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904562

10. Multimodal, Nanoscale, Hyperspectral Imaging Demonstrated on Heterostructures of Quantum Dots and DNA-Wrapped Single-Wall Carbon Nanotubes
Published: 10/21/2009
Authors: Hyeong Gon Kang, Matthew Lawrence Clarke, Jianyong Tang, John Taylor Woodward IV, Shin G. Chou, Zhenping Zhou, Angela R Hight Walker, Tinh Nguyen, Jeeseong Hwang
Abstract: A multimodality imaging technique integrating atomic force, polarized Raman, and fluorescence lifetime microscopy and a 2D autocorrelation image analysis is applied to study the properties of a mesoscopic heterostucture of nanoscale materials. This ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902938



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