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Chemistry

Analytical chemistry

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Displaying 1076 - 1100 of 2118

Surface Plasmon Polariton Raman Microscopy

January 1, 2012
Author(s)
Hae-Wook Yoo, Lee J. Richter, Hee-Tae Jung, Chris A. Michaels
We report surface plasmon polariton (SPP) mediated Raman microscopy on dielectric films in contact with a Ag layer at 785 nm with spatial resolution approaching the optical diffraction limit and reasonable spectral acquisition times. The excitation and

The BIOREMA project part 3: International interlaboratory comparison for bio-ethanol test methods

January 1, 2012
Author(s)
Michele M. Schantz, Adriaan van der Veen, Hugo Ent, Annaratia Baldan, Valnei Cunha, Romeu Daroda, Manuela Ulberth-Buchgraber, Brian E. Lang, Andrea Held, Ruth Hearn, Richard Brown, Paul Brewer
The main objective of the BIOREMA (Reference Materials for Biofuel Specifications) project is the development of two test materials (one bio-ethanol material and one biodiesel material) with well-established reference values. This paper describes the

2-Bromo-3,3,3-Trifluoropropene: OH Reaction Rate Constant, IR Absorption Spectrum, Ozone Depletion Potentials and Global Warming Potentials

December 30, 2011
Author(s)
Kenneth O. Patten, Victor Khamaganov, Vladimir L. Orkin, Steven L. Baughcum, Donald J. Wuebbles
The rate constant for the gas phase reaction of OH radicals with BTP (2-Bromo-3,3,3-trifluoropropene, CH2=CBrCF3) was measured using a flash photolysis resonance-fluorescence technique over the temperature range 220 K to 370 K. The Arrhenius plot was found

Spectroscopy of the methane N3 Band with an accurate midinfrared coherent dual-comb spectrometer

December 28, 2011
Author(s)
Esther Baumann, Fabrizio R. Giorgetta, William C. Swann, Alexander M. Zolot, Ian R. Coddington, Nathan R. Newbury
We demonstrate a high-accuracy dual-comb spectrometer centered at 3.4 υm. The amplitude and phase spectra of the P,, Q, and partial R branches of the methane Ņ3 band are measured at 25 to 100 MHz point spacing with resolution under 10 kHz and a signal-to

Formation of y+10 and y+11 Ions in the Collision-Induced Dissociation of Peptide Ions

December 8, 2011
Author(s)
Lisa E. Kilpatrick, Pedatsur Neta, Xiaoyu Yang, Yamil Simon, Yuxue Liang, Stephen E. Stein
Tandem mass spectra of peptide ions, acquired in shotgun proteomic studies of selected proteins, tissues, and organisms, commonly include prominent peaks that cannot be assigned to the known fragmentation product ions (y, b, a, neutral losses). In many

Recommended Auger Parameters for 42 Elemental Solids

December 4, 2011
Author(s)
Cedric J. Powell
Values of the Auger parameter are presented for 42 elemental solids. These values were determined from evaluated Auger-electron kinetic energies and photoelectron binding energies (BEs). Small adjustments were made to earlier values of photoelectron BEs to

A Large-Signal Model of Ferroelectric Thin-Film Transmission Lines"

December 1, 2011
Author(s)
Eduard Rocas, Juan C. Collado Gomez, Jordi Mateu, Nate Orloff, James Booth, Juan M. O'C allaghan
"This work evaluates the microwave nonlinear properties and tuning at RF frequencies of ferroelectric Ba0.3Sr0.7TiO3 thin-films by on-wafer measurements of the second and third-order harmonics and intermodulation products of several coplanar transmission

Development and Certification of Green Tea-Containing Standard Reference Materials

November 30, 2011
Author(s)
Lane Sander, Mary Bedner, Michael C. Tims, James Yen, David Duewer, Barbara J. Porter, Steven Christopher, Russell D. Day, Stephen E. Long, John Molloy, Karen Murphy, Brian Lang, Rachel A. Lieberman, Laura J. Wood, M. Payne, M. C. Roman, J. M. Betz, A. NguyenPho, Katherine Sharpless, Stephen Wise
A suite of three green tea-containing Standard Reference Materials (SRMs) has been issued by the National Institute of Standards and Technology (NIST). The materials are characterized for catechins, xanthine alkaloids, theanine, and toxic elements. As many

Environmental Analysis: Persistent Organic Pollutants

November 29, 2011
Author(s)
Lane C. Sander, Michele M. Schantz, Stephen A. Wise
The term “persistent organic pollutants” (POPs) describes a broad range of anthropogenic compounds that are present in the environment. Persistent organic pollutants can be grouped into subclasses based on their original intended uses or chemical

Isotope Dilution Liquid Chromatography - Mass Spectrometry Methods for Fat- and Water-Soluble Vitamins in Nutritional Formulations

November 24, 2011
Author(s)
Karen W. Phinney, Catherine A. Rimmer, Jeanice M. Brown Thomas, Lane C. Sander, Katherine E. Sharpless, Stephen A. Wise
Vitamins are essential to human health, and dietary supplements containing vitamins are widely used by individuals hoping to ensure they have adequate intake of these important nutrients. Measurement of vitamins in nutritional formulations is necessary to

Capacitive readout technique for studies of dissipation in GaN nanowire mechanical resonators

November 11, 2011
Author(s)
Kristine A. Bertness, Joshua R. Montague, Norman A. Sanford, Victor Bright, Charles T. Rogers
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-axis

Characterization of (1-3,1-6)-b-D-Glucan Side Chain Structure Provides the Basis for a New Model of Fungal Cell Wall Rigidity and Flexibility

November 11, 2011
Author(s)
Daniel W. Bearden, Douglas W. Lowman, Lara J. West, Michael F. Wempe, Trevor D. Power, Harry E. Ensley, Ken Haynes, David L. Williams, Michael D. Kruppa
Glucan is a (1-3)-β-linked glucose polymer with (1-6)-β-linked side chains and a major component of fungal cell walls. Glucans provide structural integrity to the fungal cell wall. The nature of the (1-6)-β-linked side chain structure of fungal (1-3,1-6)-β
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