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Displaying 801 - 825 of 911

Preparation and Structure of Low-Density, Flat-Lying Decanethiol Monolayer From the Densely-Packed, Upright Monolayer on Gold

January 1, 2006

Author(s)

Laura B. Picraux, Christopher D. Zangmeister, J Batteas

This study investigates the formation of low-density, flat-lying decanethiol chemisorbed on Au prepared by heating the surface covered with a densely-packed, upright monolayer to a surface temperature above the onset of desorption. We determined conditions

Intrinsic Wavelength Standard Absorption Bands in Holmium Oxide Solution for UV/Visible Molecular Absorption Spectrophotometry

November 1, 2005

Author(s)

David L. Duewer, John C. Travis, J. C. Acosta, G Andor, J Bastie, P. Blattner, C J. Chunnilall, S. C. Crosson, E. A. Early, F. Hengstberger, C. Kim, L. Liedquist, F Manoocheri, A. Mito, L.A. G. Monard, S Nevas, M. Nilsson, M Noel, A C. Rodriguez, A Ruiz, A. Schirmacher, M V. Smith, G. Valencia, N. van Tonder, Joanne C. Zwinkels

Order and Disorder in Alkyl Stationary Phases

June 1, 2005

Author(s)

Lane C. Sander, Katrice A. Lippa, Stephen A. Wise

Laser Cooling Transitions in Atomic Erbium

April 18, 2005

Author(s)

H Ban, M Jacka, James L. Hanssen, Joseph Reader, Jabez J. McClelland

We discuss laser cooling opportunities in atomic erbium, identifying five J rarr} J + 1 transitions from the 4f 126s 2 3H 6 ground state that are accessible to common visible and near-infrared continuous-wave tunable lasers. We present lifetime

Precise Determination of 6 Li Cold Collision Parameters by Radio-Frequency Spectroscopy on Weakly Bound Molecules

March 1, 2005

Author(s)

M Bartenstein, A Altmeyer, S Riedl, R Geursen, S Jochim, C Chin, J Hecker Denschlag, R Grimm, Andrea Simoni, Eite Tiesinga, Carl J. Williams, Paul S. Julienne

Radio-frequency spectroscopy on weakly bound 6Li_2 molecules determines to high precision the molecular binding energies and the energy splitting between molecular states. By fitting the measurement to a multi-channel quantum scattering model, we determine

Achieving induced transparency with one- and three-photon destructive interference in a two-mode, three-level, double-L system

January 28, 2005

Author(s)

Lu Deng, M G. Payne

We show that in a two-mode, three-level, double-L system an efficient multiphoton destructive interference involving one- and three-photon pumping pathways occurs, leading to a unique type of induced transparency. Unlike the conventional

Infrared and Raman Spectroscopy Characterization of Biological Products

January 1, 2005

Author(s)

Vytautas Reipa

Both infrared and Raman are increasingly applied in biomolecular structure characterization, thus getting acceptance alongside traditional bioanalytical techniques. Physical principles and biological sampling requirements are reviewed. Advanced

Ultrafast Transient THz Spectroscopy of Azobenzene

January 1, 2005

Author(s)

Okan Esenturk, Edwin J. Heilweil

Efficient multi-wave mixing in ultra slow propagation regime and the role of multi-photon quantum destructive interference,

October 1, 2004

Author(s)

Y Wu, M G. Payne, Edward W. Hagley, Lu Deng

We analyze a lifetime-broadened four-state four-wave-mixing (FWM) scheme in the ultraslow propagation regime and show that the generated FWM field can acquire the same group velocity and pulse shape as those of an ultraslow pump field. We show that a new

Fermi Level Alignment and Electronic Levels in Molecular Wire Self-Assembled Monolayers on Au

October 1, 2004

Author(s)

Christopher D. Zangmeister, Steven W. Robey, Roger D. van Zee, Yuxing Yao, J M. Tour

A combination of one- and two-photon photoelectron spectroscopies are used to determine the electronic structure around the Fermi level for self-assembled monolayers of a prototypical molecular wire , 4,4 -(ethynylphenyl)-1-benzenethiol (C6H5-C≡C-C6H4-C≡C-

Structure of Polystyrene at the Interface With Various Liquids

September 4, 2004

Author(s)

Clayton S. Yang, P T. Wilson, Lee J. Richter

Vibrationally resonant sum frequency generation (VR-SFG) is used to determine the structure of the phenyl side groups of deuterated polystyrene at the liquid/solid interface for the nonsolvent liquids: hexane, methanol, ethanol, glycerol, and water. The

Inelastic wave mixing and multi-photon destructive interference based induced transparency in coherently prepared media

September 1, 2004

Author(s)

Lu Deng, Marvin G. Payne, W R. Garrett

We consider a multi-level medium initially prepared with a coherent superposition of two initial levels that are not directly dipole-coupled. We study the production of multi-wave mixing in the coherent medium, where the process begins on one and

Ultra slow bright and dark optical solitons in a cold three-state medium,

September 1, 2004

Author(s)

Y Wu, Lu Deng

We show the formation of ultraslow bright and dark optical solitons in a lifetime-broadened three-state atomic system under Raman excitation. We also discuss why such ultraslow optical solitons may not exist under the conditions of the usual

Shear-Induced Structure in Polymer-Clay Nanocomposite Solutions

June 1, 2004

Author(s)

Sheng Lin-Gibson, H W. Kim, G Schmidt, Charles C. Han, Erik K. Hobbie

Abstract: The equilibrium structure and shear response of model polymer-clay nanocomposite gels are measured using X-ray scattering, light scattering, optical microscopy, and rheometry. The suspensions form physical gels via the bridging of neighboring

Temperature-induced structural changes in putidaredoxin: a circular dichroism and UV-VIS absorption study

June 1, 2004

Author(s)

Vytautas Reipa, Marcia J. Holden, M P. Mayhew, V L. Vilker

Valence Electron Orbitals of an Oligo(p-phenylene-ethynylene)thiol on Gold

March 1, 2004

Author(s)

Christopher D. Zangmeister, Steven W. Robey, Roger D. van Zee, Yuxing Yao, J M. Tour

One- and two-photon photoemission spectra have been measured for monolayers of oligo(para-phenylene-ethynylene) thiolate chemisorbed on gold surfaces. Within 5 eV of the Fermi level, four states are observed, two occupied (2.0 eV and 4.0 eV below the Fermi

High-Resolution Cavity Ring-Down Spectroscopy of H216O at 10687.36 cm-1

February 11, 2004

Author(s)

Joseph T. Hodges

We describe a frequency-stabilized cavity ring-down spectroscopy apparatus enabling high-resolution line shape measurements of water vapor. The measured line strength and broadening parameter for the H216O transition at 10687.36 cm-1 are compared to

Achieving multi-frequency state entanglement with ultra-slow multi-wave mixing

January 1, 2004

Author(s)

Y Wu, Lu Deng

We propose a scheme to achieve the entanglement of N photon modes (frequency modes) with perfectly efficient ultraslow multiwave mixing in a cold atomic medium. In addition, the method provides an efficient approach to realizing frequency tunability.

Inhibiting the Onset of the Three-Photon Destructive Interference in Ultra-Slow Propagation Enhanced Four-Wave Mixing with Dual Induced Transparency

December 1, 2003

Author(s)

Lu Deng, Marvin G. Payne

We propose a dual electromagnetically induced transparency (EIT) based multiwave mixing scheme that retains the significantly enhanced conversion efficiency enabled by ultraslow propagation of pump waves, yet is also capable of inhibiting and delaying the

Quantum Mirages in Scanning Tunneling Spectroscopy of Kondo Adsorbates: Vibrational Signatures

December 1, 2003

Author(s)

John William Gadzuk, M Plihal

Scanning tunneling microscopy/spectroscopy on Kondo systems consisting of magnetic atoms adsorbed upon non-magnetic metal surfaces has demonstrated the ability of suitable two-dimensional nanostructures (such as quantum corrals) to influence the surface

The Use of Optical Cavities for Modern Atomic Molecular, and Optical Physics

December 1, 2003

Author(s)

J Ye, T W. Lynn

For many contemporary physics experiments, the use of an optical cavity has become a powerful tool for enhancement in detection sensitivities, nonlinear interactions, and quantum dynamics. Indeed an optical cavity allows one to extend the interaction

Quantum Entanglement of Fock States with Perfectly Efficient Ultraslow Single-Probe Photon Four-Wave Mixing

September 18, 2003

Author(s)

Lu Deng, M. G. Payne

We propose a method to achieve quantum entanglement of two Fock states with perfectly efficient, ultraslow propagation enhanced four-wave mixing. A cold atomic medium is illuminated with a twomode cw control laser to produce coherent mixtures of excited

Rare-Earth Glass Reference Materials for Near-Infrared Spectrometry: Sources of X-Axis Location Variability

August 25, 2003

Author(s)

David L. Duewer, Steven J. Choquette, L O'Neal, James J. Filliben

Distribution of Chlorine in Quartz Determined by Neutron Beam Focusing Prompt Gamma Activation Analysis and Micro X-ray Fluorescence

July 1, 2003

Author(s)

Huaiyu H. Chen-Mayer, W J. Heward, Rick L. Paul, F J. Klug, Y Gao

Relative Intensity Correction Standards for Raman Spectroscopy for Excitation with Several Common Laser Wavelengths

July 1, 2003

Author(s)

Steven J. Choquette, Douglas H. Blackburn, E S. Etz, Wilbur S. Hurst