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Displaying records 11 to 20 of 86 records.
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11. Frequency-agile, rapid scanning spectroscopy: absorption sensitivity of 2×10-12 cm-1 Hz-1/2 with an external-cavity diode laser
Topic: Spectroscopy
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 ...

12. Frequency-agile, rapid scanning spectroscopy
Topic: 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 ...

13. The Detection of Interstellar Ethanimine (CH3CHNH) from Observations taken during the GBT PRIMOS Survey
Topic: Spectroscopy
Published: 2/13/2013
Authors: Francis John Lovas, Ryan A. Loomis, Daniel P. Zaleski, Amanda L. Steber, Justin L. Neill, Matthew T. Muckle, Brent J. Harris, Jan M. Hollis, Phillip R. Jewell, Valerio Lattanzi, Oscar Martines, Michael C. McCarthy, Anthony J. Remijan, Brooks H. Pate
Abstract: As the availab¬¬ility of publicly accessible spectral line surveys from radio astronomy increases, new approaches to the identification of molecules in the interstellar medium are possible. We have performed reaction product screening measurements u ...

14. To Predict Vibrational Spectra, Are Anharmonic Calculations Worthwhile?
Topic: Spectroscopy
Published: 1/22/2013
Authors: Ruth Lafuente Jacobsen, Karl K Irikura, Russell D Johnson III, Raghu N Kacker
Abstract: Anharmonic calculations using vibrational perturbation theory are known to provide near-spectroscopic accuracy when combined with high-level ab initio potential energy functions. However, performance with economical, popular electronic structure meth ...

15. Temperature Dependence of Electron Magnetic Resonance Spectra of Iron Oxide Nanoparticles Mineralized in Listeria Innocua Protein Cages
Topic: Spectroscopy
Published: 10/16/2012
Author: Robert J. Usselman
Abstract: Electron magnetic resonance (EMR) spectroscopy was used to determine the magnetic properties of maghemite (gamma-F^de^2O^d3^) nanoparticles formed within size-constraining {I}Listeria innocua{/I} Dps protein cages that have an inner diameter of 5 nm. ...

16. Controlling Thermochromism in a Photonic Block Copolymer Gel
Topic: Spectroscopy
Published: 9/26/2012
Authors: Joseph J Walish, Yin Fan , Andrea Centrone, Edwin L. Thomas
Abstract: Controlling the color via temperature-induced changes of self-assembled photonic materials is important for their application in sensors and displays. The thermochromic behavior of a PS-P2VP photonic gel was studied (UV-VIS, FTIR) and found to origin ...

17. On spectroscopic models of the O2 A-band and their impact upon atmospheric retrievals
Topic: Spectroscopy
Published: 6/27/2012
Authors: David A Long, Joseph Terence Hodges
Abstract: Highly accurate spectroscopic models for O2 A-band absorption are required in numerous satellite- and ground-based remote sensing measurements of atmospheric greenhouse gases. In this study, we quantify the sensitivity of the calculated A-band transm ...

18. Predictive Gold Nanocluster Formation Controlled by Metal-Ligand Complexes
Topic: Spectroscopy
Published: 1/9/2012
Authors: John M Pettibone, Jeffrey W Hudgens
Abstract: The formation of ligand-protected transition metal nanoclusters in size-selective syntheses is driven by the inherent properties of the protecting ligands. We have previously reported the selective, monodisperse product formation of phosphine protect ...

19. Charaterization of Standard Reference Material 2943, Cu-Ion-Doped Glass, Spectral Correction Standard for Blue Fluorescence
Topic: Spectroscopy
Published: 12/1/2011
Authors: Paul C DeRose, Melody V Smith, Klaus Mielenz, Jeffrey R. Anderson, Gary W Kramer
Abstract: Standard Reference Material (SRM) 2943 is a cuvette-shaped, Cu0ion-doped glass, recommended for use for relative spectral correction of emission and day-to-day performance verification of steady-state florescence spectrometers. Properties of this st ...

20. Capacitive readout technique for studies of dissipation in GaN nanowire mechanical resonators
Topic: Spectroscopy
Published: 11/11/2011
Authors: Kristine A Bertness, Joshua R. Montague, Norman A Sanford, Victor Bright, C. T. Rogers
Abstract: A variable-temperature, homodyne reflectometry measurement technique for detecting nanoscale mechanical motion has recently been developed. We have extended this technique to make the first all-electrical measurements of an ensemble of as-grown, c-a ...

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