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Displaying 801 - 825 of 927

Limitations of steady state solutions to a two-state model of population oscillations and hole burning

December 12, 2006

Author(s)

Lu Deng, Marvin G. Payne, Kaijun Jiang

We consider a two-state system driven by an on-resonance, continuous wave pump laser and a much weaker pulsed probe laser that is slightly detuned from the pump laser frequency usually this detuning is about p −P=1 kHz. The upper state population is

Ultraslow propagation of an optical pulse in a three-state active Raman gain medium

October 9, 2006

Author(s)

Lu Deng, Marvin G. Payne, Kaijun Jang

We investigate an active Raman gain scheme for significant group velocity reduction. We show that this scheme, which is fundamentally different from the electromagnetically induced transparency scheme, is capable of achieving ultraslow and distortion-free

Stable high-dimensional spatial weak-light solitons in a resonant three-state atomic system

October 3, 2006

Author(s)

Lu Deng, Guoxiang Huang, C Hang

We study the formation of a nonlinear localized high-dimensional optical beam in a lifetime- broadened three-state atomic system. We show that stable high-dimensional spatial optical solitons with extremely weaklight intensity can occur in such a highly

Determination of Lipid Phase Transition Temperatures in Hybrid Bilayer Membranes

September 9, 2006

Author(s)

Neil A. Anderson, Lee J. Richter, John C. Stephenson, Kimberly A. Briggman

The main gel to liquid crystal (LC) phase transition temperature, Tm, of the lipid monolayers in hybrid bilayer membranes (HBMs) was investigated using vibrational sum frequency spectroscopy (VSFS). The unique sensitivity of VSFS to probe order/disorder

Frequency-stabilized cavity ring-down spectrometer for high-sensitivity measurements of water vapor concentration

August 12, 2006

Author(s)

Joseph T. Hodges, D Lisak

We present a portable spectrometer that uses the frequency-stabilized cavity ring-down spectroscopy technique to realize high-precision measurements of trace water vapor concentration. Measuring one of the strongest rovibrational transitions in the 1 + 3

Broadband coherent anti-strokes Raman spectroscopy characterization of polymer thin films

August 2, 2006

Author(s)

Lee J. Richter, M C. Gurau, Zachary Schultz

Broadband coherent anti-Stokes Raman spectroscopy (CARS) is demonstrated as an effective probe of the polymer thin film materials. A simple modification to a commercially available 1 kHz SFG spectrometer permits acquisition of CARS spectra for polymer thin

Fermi Level Alignment in Self-Assembled Molecular Layers: The Effect of Coupling Chemistry

August 1, 2006

Author(s)

Christopher D. Zangmeister, Steven W. Robey, Roger D. van Zee

Photoelectron spectroscopy was used to explore changes in Fermi level alignment, within the p-p* gap, arising from changes in the coupling chemistry of conjugated phenylene ethynlene oligomers to the Au surface. Self-assembled monolayers were formed

Round Robin Study of Arsenic Implant Dose Measurement in Silicon by SIMS

July 30, 2006

Author(s)

David S. Simons, Richard M. Lindstrom

Propagation of shape-preserving optical pulses in inhomogeneously broadened multi-level systems

July 12, 2006

Author(s)

Lu Deng, Guoxiang Huang, C Hang

We study stable propagation of multiple shape-preserving optical pulses in an inhomogeneously broadened multi-level atomic medium. By analytically solving the Maxwell-Schr¿odinger equations governing the evolution of N coupled optical fields and atomic

Natural Linewidth of the 401-nm Laser-Cooling Transition in Er I

June 20, 2006

Author(s)

Jabez J. McClelland

A measurement of the natural linewidth of the 401 nm 4f 126s 2 ( 3H 6) {rarr} 4f 12( 3H)6s6p ( 1P o 1) (6,1) 7 o transition in Er I is presented. Using laser-induced fluorescence in an atomic beam, a linewidth of (36.0 {plus or minus} 1.2) MHz is observed

Formation and propagation of coupled ultraslow optical soliton pairs in a cold three-state double- system

May 17, 2006

Author(s)

Lu Deng, M. G. Payne, Guoxiang Huang, kaijun Jiang

We investigate the simultaneous formation and propagation of coupled ultraslow optical soliton pairs in a cold, lifetime-broadened three-state double- atomic system. Starting from the equations of motion of atomic response and two-mode probe-control

Effects of multi-photon interferences from internally generated fields in strongly resonant systems

March 29, 2006

Author(s)

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

In studies of various nonlinear optical phenomena, strong resonant features in the atomic or molecular response to multi-photon driven processes have been used to greatly enhance the visibility of otherwise weak higher- order processes. However, there are

Conformational Changes Associated With Receptor-Stimulated Guanine Nucleotide Exchange in a Heterotrimeric G-Protein a-Subunit: NMR Analysis of the GTPgS-Bound States

March 17, 2006

Author(s)

K D. Ridge, N G. Abdulaev, Xi-Cheng Zhang, T Ngo, D M. Brabazon, John P. Marino

Solution NMR studies of a 15N-labeled G-protein ?-subunit (G?) chimera (15N-ChiT) reconstituted heterotrimer have previously shown that binding of ??-subunits induces a pre-activated conformation in G? that may facilitate interaction with R* and guanine

Generalized nonlinear Schrodinger equation and ultraslow optical solitons in a cold four-state atomic system

March 13, 2006

Author(s)

Lu Deng, Guoxiang Huang, C Hang

We investigate the influence of high-order dispersion and nonlinearity on the propagation of ultraslow optical solitons in a lifetime broadened four-state atomic system under a Raman excitation. Using a standard method of multiple-scales we derive a

Highly efficient inelastic four-wave mixing using dual induced transparency and coherently prepared states

March 13, 2006

Author(s)

Lu Deng, M. G. Payne, Kaijun Jiang

We investigate a life time broadened and coherently prepared five-state system for multi-wave mixing processes. We show that very efficient wave mixing occurs, producing an unconventional mixing wave that has the characteristics of both conventional four

Frequency-Stabilized Cavity Ring-Down Spectrometer for High-Sensitivity Measurements of Water Vapor Concentration

January 1, 2006

Author(s)

Joseph T. Hodges, Daniel Lisak

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