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You searched on: Author: david plusquellic Sorted by: date

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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 ...

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 ...

3. Corrosion Detection in Concrete Rebars Using a Spectroscopic Technique
Published: 1/11/2014
Authors: Edward Joseph Garboczi, Paul E Stutzman, Shuangzhen S. Wang, Nicos Martys, Dat Duthinh, Virgil Provenzano, Shin G. Chou, David F Plusquellic, Jack T Surek, Sung Kim, Robert D McMichael, Mark D Stiles, Ahmed M. Hassan
Abstract: Detecting the early corrosion of steel in reinforced concrete is a goal that has been much pursued. Since 2010, NIST has been working on a large project to develop an electromagnetic (EM) probe that detects the actual corrosion products via spectrosc ...

4. Measurement and Simulation of Millimeter Wave Scattering Cross-sections from Steel-Reinforced Concrete
Published: 1/11/2014
Authors: Ahmed M. Hassan, Edward Joseph Garboczi, Robert D McMichael, Jack T Surek, Mark D Stiles, David F Plusquellic, Virgil Provenzano, Paul E Stutzman, Shuangzhen S. Wang, Sung Kim, Michael D Janezic, Jason B Coder, Nicos Martys, David R Novotny
Abstract: Some iron oxide corrosion products exhibit antiferromagnetic magnetic resonances (AFMR) at around 100 GHz at normal temperatures. AFMR can be detected in laboratory conditions, which serves as the basis for a new non-destructive spectroscopic method ...

5. 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 ...

6. 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 ...

7. Frequency-agile, rapid scanning spectroscopy: absorption sensitivity of 2×10-12 cm-1 Hz-1/2 with an external-cavity diode laser
Published: 8/3/2013
Authors: David A Long, Gar Wing Truong, Roger D van Zee, David F Plusquellic, Joseph Terence Hodges
Abstract: We present ultra-sensitive measurements of molecular absorption using frequency-agile rapid scanning, cavity-ring down spectroscopy with an external-cavity diode laser. A microwave source that drives an electro-optic phase modulator with a bandwidth ...

8. Excitonic splitting and Vibronic Coupling in 1,2-diphenoxyethane: Conformation-specific effects in the weak coupling limit
Published: 5/30/2013
Authors: buchanan Evan, Patrick Walsh, David F Plusquellic, Timothy Zwier
Abstract: Vibrationally and rotationally resolved electronic spectra of 1,2-diphenoxyethane (C6H5-O-CH2-CH2-O-C6H5) are reported for the isolated molecule under jet-cooled conditions. The spectra demonstrate that the two excited surfaces are within a few cm-1 ...

9. 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 ...

10. 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 ...

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