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Search Publications by: Angela R. Hight Walker (Fed)

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Displaying 276 - 300 of 352

Continuous-Wave Terahertz Spectroscopy of Plasmas and Biomolecules

March 1, 2004
Author(s)
David F. Plusquellic, T M. Korter, Gerald T. Fraser, R J. Lavrich, Eric C. Benck, C R. Bucher, Angela R. Hight Walker, J L. Domenech
Continuous-wave linear-absorption spectroscopy based on THz radiation generated by solid-state photomixers has been applied to the investigation of the dynamics of biomolecules in polyethylene matrices and to line shape studies of HF for diagnostics of

Surface Enhanced Raman Spectroscopy in a Microfluidic Device

February 1, 2004
Author(s)
D Dunmire, D B. Romero, Guangjun Cheng, Angela R. Hight Walker
Surface enhanced Raman spectroscopy (SERS) is employed to study the solution phase vibrational structure of molecules on gold and silver colloids. Gold and silver colloids show large enhancement factors enabling sub-micromolar detection limits. Using a

Synthesis of Bioconjugated Magnetic Nanoparticles for Magneto-Raman Study

February 1, 2004
Author(s)
Guangjun Cheng, D B. Romero, D Dunmire, Angela R. Hight Walker
We are investigating the effects of an externally applied magnetic field on the structure and magnetic properties of biomolecules (DNA and proteins). A newly constructed, magneto-Raman confocal microscope system couples a cryo-magnet to a triple grating

Rotational Spectrum of Soman

January 1, 2004
Author(s)
R S. DaBell, R D. Suenram, Angela R. Hight Walker, R J. Lavrich, David F. Plusquellic, M W. Ellzy, J M. Lochner, L Cash, J O. Jensen, A C. Samuels

Conformational Analysis of the Jet-Cooled Peptide Mimetic Ethylacetamidoacetate from Torsion-Rotation Spectra

September 1, 2003
Author(s)
R J. Lavrich, Angela R. Hight Walker, David F. Plusquellic, I Kleiner, R D. Suenram, Jon T. Hougen, Gerald T. Fraser
Rotational spectra of two conformers of the dipeptide mimetic, ethyl acetamidoacetate, were measured in a molecular beam using a Fourier-transform microwave spectrometer. In each conformer, internal rotation of the acetyl methyl group gives rise to

Experimental Studies of Peptide Bonds: Identification of the C 7 eq Conformation of the Alanine Dipeptide Analog N-Acetyl-Alanine N'-Methylamide From Torsion-Rotation Interactions

January 1, 2003
Author(s)
R J. Lavrich, David F. Plusquellic, R D. Suenram, Gerald T. Fraser, Angela R. Hight Walker, M J. Tubergen
Rotational spectra of the bio-mimetic molecule, alanine dipepitide and the double 15N( 15N 2) isotopomer have been observed using a pulsed-molecular-beam Fourier transform microwave spectrometer. The spectra reveal large tunneling splittings from the

The Validation of Fourier-Transform Microwave Spectroscopy for Trace-Gas Analysis

February 1, 2002
Author(s)
Pamela M. Chu, R D. Suenram, Angela R. Hight Walker, R S. DaBell, George C. Rhoderick, Gerald T. Fraser
There is strong interest by regulatory agencies and automobile manufacturers, motivated in large part by increasingly stringent emission standards, for measurement tools capable of quantifying various hydrocarbons, oxygenated hydrocarbons, etc., in