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Author: david plusquellic
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1. Vibronic Coupling in Asymmetric Bichromophores: Experimental Investigation of Diphenylmethane-d5
Published: 8/14/2014
Authors: Nathan Pillsbury, Nathanael M Kidwell, Benjamin Nebgen, Lyudmila V Slipchenko, Kevin O Douglass, John R Cable, David F Plusquellic
Abstract: Vibrationally and rotationally resolved electronic spectra of diphenylmethane-d5 (DPM-d5) are reported in the isolated-molecule environment of a supersonic expansion. While small, the asymmetry induced by deuteration of one of the aromatic rings is ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916163

2. Multiheterodyne spectroscopy with optical frequency combs generated from a continuous-wave laser
Published: 5/1/2014
Authors: David A Long, Adam J Fleisher, Kevin O Douglass, Stephen E Maxwell, Katarzyna Ewelina Bielska, Joseph Terence Hodges, David F Plusquellic
Abstract: Dual-drive Mach-Zehnder modulators were utilized to produce power-leveled optical frequency combs (OFCs) from a continuous-wave laser. The resulting OFCs contained up to fifty unique frequency components and spanned more than 200 GHz. Simple changes ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915142

3. Rapid scan absorption spectroscopy using a waveform-driven electro-optic phase modulator in the 1.6- 1.65 {mu}m region
Published: 9/25/2013
Authors: Kevin O Douglass, Stephen E Maxwell, Gar-Wing Truong, Roger D van Zee, Joseph Terence Hodges, David A Long, David F Plusquellic
Abstract: A method is reported for performing fast optical frequency scans over a bandwidth of 36.9 GHz and at a sweep rate of 40 kHz using a single second-order sideband from an electro-optic phase modulator driven by an arbitrary waveform generator. Sing ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913748

4. Segmented chirped-pulse Fourier transform submillimeter spectroscopy for broadband gas analysis
Published: 8/15/2013
Authors: Justin L. Neill, Brent J. Harris, Amanda L. Steber, Kevin O Douglass, David F Plusquellic, Brooks H. Pate
Abstract: Chirped-pulse Fourier transform spectroscopy has recently been extended to millimeter wave spectroscopy as a technique for the characterization of room-temperature gas samples. Here we present a variation of this technique that significantly redu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913245

5. Frequency-agile, rapid scanning spectroscopy
Published: 4/28/2013
Authors: Gar-Wing Truong, Kevin O Douglass, Stephen E Maxwell, Roger D van Zee, David F Plusquellic, Joseph Terence Hodges, David A Long
Abstract: Challenging applications in trace gas analyses require high precision and acquisition rates.1-4 Many continuous-wave laser spectroscopy techniques exhibit significant sensitivity and potential;5 however, their scanning rates are slow because they rel ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912076

6. 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

7. 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

8. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909253

9. 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

10. 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



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