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Improving acoustic determinations of the Boltzmann constant with mass spectrometer measurements of the molar mass of argon

September 30, 2015

Author(s)

Inseok Yang, Laurent Pitre, Michael R. Moldover, Jintao Zhang, XiaoJuan Feng, Jin Seog Kim

We determined accurate values of ratios among the average molar masses MAr of 9 argon samples using two completely-independent techniques: (1) mass spectroscopy and (2) measured ratios of acoustic resonance frequencies. The two techniques yielded mutually

Mid-infrared spectroscopy beyond the diffraction limit via direct measurement of photothermal effect

September 30, 2015

Author(s)

Aaron M. Katzenmeyer, Glenn E. Holland, Jungseok Chae, Alan H. Band, Kevin Kjoller, Andrea Centrone

An atomic force microscope equipped with temperature sensitive probes was used to measure locally the photothermal effect induced by IR light absorption. This novel instrument opens a pathway to correlated topographical, chemical composition, and thermal

The Predictive Power of the Annellation Theory: The Case of the C26H16 Cata-Condensed Benzenoid Polycyclic Aromatic Hydrocarbons

September 30, 2015

Author(s)

Jorge O. Ona Ruales, Ruiz-Morales Yosadara

The Annellation Theory was applied for the establishment of the locations of maximum absorbance for the p and β bands in the UV-Vis spectra of 8 benzenoid cata-condensed polycyclic aromatic hydrocarbons, PAHs, with molecular formula C26H16 and no available

Metal-Dielectric-Metal Resonators with Deep Subwavelength Dielectric Layers Increase the Near-Field SEIRA Enhancement

September 24, 2015

Author(s)

Jungseok Chae, Basudev Lahiri, John M. Kohoutek, Glenn Holland, Henri Lezec, Andrea Centrone

Plasmonic nanostructures presenting either structural asymmetry or metal-dielectric-metal (M-D-M) architecture are commonly used structures to increase the quality factor and the near-field confinement in plasmonic materials. This characteristic can be

Time-resolved terahertz spectroscopy (TRTS) of electrically conductive metal-organic frameworks (MOFs) doped with redox active species

September 24, 2015

Author(s)

Brian G. Alberding, Edwin J. Heilweil

Metal-Organic Frameworks (MOFs) are three-dimensional coordination polymers that are well known for large pore surface area and their ability to adsorb molecules from both the gaseous and solution phases. In general, MOFs are electrically insulating, but

In-source collision induced dissociation of inorganic explosives for mass spectrometric signature detection and chemical imaging

September 23, 2015

Author(s)

Thomas P. Forbes, Edward R. Sisco

In-source collision induced dissociation (CID) coupled with laser desorption/ionization mass spectrometry (LDI-MS) demonstrated the trace detection, bulk quantification, and chemical imaging of inorganic explosives and components. The incorporation of in

The ABCs of Using Standard Reference Materials in the Analysis of Foods and Dietary Supplements: A Practical Guide

September 16, 2015

Author(s)

Katherine E. Sharpless, David L. Duewer, Katrice A. Lippa, Andrew L. Rukhin

Although "nutraceuticals" and "functional foods" seem to be ill-defined terms, both are often used to indicate a food that contains compounds providing benefits beyond basic nutrition, often with the expectation that these compounds are protective against

Metrological approaches to organic chemical purity: primary reference materials for vitamin D metabolites

September 7, 2015

Author(s)

Michael A. Nelson, Mary Bedner, Brian E. Lang, Blaza Toman, Katrice A. Lippa

Given the critical role of pure, organic compound primary reference standards used to characterize and certify chemical Certified Reference Materials (CRMs), it is essential that associated mass purity assessments be fit-for-purpose, represented by an

Broadband phase spectroscopy over turbulent air paths

September 4, 2015

Author(s)

Fabrizio R. Giorgetta, Greg B. Rieker, Esther Baumann, William C. Swann, Laura C. Sinclair, Jonathan Kofler, Ian R. Coddington, Nathan R. Newbury

Broadband atmospheric phase spectra are measured at sub-milliradian uncertainty corresponding to a 10-13 refractive index change, despite strong decoherence from atmospheric turbulence. A phase-sensitive dual-comb spectrometer acquires spectra over 233 cm

Retention projection enables accurate calculation of liquid chromatographic retention times across labs and methods

September 3, 2015

Author(s)

Yamil Simon, Daniel Abate-Pella, Dana M. Freund, Yan Ma, Adrian Hegeman, Yan Ma, Tobias Kind, O Fiehn, Birgit Beck, Emma L. Schymanski, Corey D. Broeckling, David V. Huhman, Lloyd W. Summer, Oleg V. Krokhin, Dwight R. Stoll

Identification of small molecules by liquid chromatography-mass spectrometry (LC-MS) could be greatly improved if the chromatographic retention information could be used along with mass spectral information to narrow down the lists of potential identities

Viscosity Measurements of Aviation Turbine Fuels

September 3, 2015

Author(s)

Tara J. Fortin, Arno D. Laesecke

Kinematic viscosity has been measured for nine separate aviation turbine fuel samples. The nine samples span the range of fuel types available: conventional petroleum-derived fuels, synthetic fuels derived from the Fischer-Tropsch process, and renewable

Correction for stray light in optical spectroscopy of crystals

September 1, 2015

Author(s)

Richard W. Hendler, Curtis Meuse, David Travis Gallagher, Joerg Labahn, Jan Kubicek, Paul D. Smith, John W. Kakareka

It has long been known in spectroscopy that light not passing through a sample, but reaching the detector (i.e. stray light) results in a distortion of the spectrum known as absorption- flattening. In spectroscopy with crystals, one must either include

Muffin tin potentials in EXAFS analysis

September 1, 2015

Author(s)

Bruce D. Ravel

Muffin tin potentials are the standard tool for calculating the potential surface of a cluster of atoms for use in the analysis of extended x-ray-absorption fine-structure (EXAFS) data. The set of Cartesian coordinates used to define the positions of atoms

Diluvian clustering - A fast, effective algorithm for clustering compositional and other data

August 25, 2015

Author(s)

Nicholas Ritchie

Diluvian clustering is an unsupervised grid-based clustering algorithm well suited to interpreting large sets of noisy compositional data. The algorithm is notable for its ability to identify clusters which are both compact and diffuse and clusters which

Performance of a dual Fabry-Perot cavity refractometer

August 18, 2015

Author(s)

Patrick F. Egan, Jack A. Stone Jr., Jay H. Hendricks, Jacob E. Ricker, Gregory E. Scace, Gregory F. Strouse

We have built and characterized a refractometer that utilizes two Fabry-Perot cavities formed on a dimensionally stable spacer. In the typical mode of operation, one cavity is held at vacuum and the other cavity is filled with nitrogen gas. The

Fourier Transform Infrared Absorption Spectroscopy for Quantitative Analysis of Gas Mixtures for Homeland Security Applications

August 11, 2015

Author(s)

Kurt D. Benkstein, Wilbur S. Hurst, Douglas C. Meier, Pamela M. Chu

Chemical detectors are crucial tools for first responders during emergency-response scenarios and for continuous monitoring of public spaces for general safety. For those who depend upon chemical detectors for safety and security, ensuring that detectors

Dew-point Measurements For Water In Compressed Carbon Dioxide

August 6, 2015

Author(s)

Christopher W. Meyer, Allan H. Harvey

When transporting CO2 for sequestration, it is important to know the water dew point in order to avoid condensation that can lead to corrosion. We have constructed a flow apparatus to measure the water content at saturation in a compressed gas. A saturator

Photovoltaic switching mechanism in lateral structure hybrid Perovskite solar cells

August 5, 2015

Author(s)

Yongbo Yuan, Jungseok Chae, Yuchuan Shao, Qi Wang, Zhengguo Xiao, Andrea Centrone, Jinsong Huang

Organometal trihalide perovskite solar cells with lateral device architecture recently attracted interest because of their switchable photovoltaic effect, which potentially could be leveraged to realize transparent-electrode-free solar cells. However, the

Development of an Ultra-Pure, Carrier-Free 209Po Solution Standard

July 23, 2015

Author(s)

Ronald Colle, Ryan P. Fitzgerald, Lizbeth Laureano-Perez

Ultra-pure, carrier-free 209Po solution standards have been prepared and standardized for their massic alpha-particle emission rate. The standards, which will be disseminated by the National Institute of Standards and Technology (NIST) as Standard

Infrared Imaging and Spectroscopy Beyond the Diffraction Limit

July 22, 2015

Author(s)

Andrea Centrone

Progress in nanotechnology is enabled by and dependent on the availability of measurement methods with spatial resolution commensurate with nanomaterials length scales. Chemical imaging techniques, such as scattering scanning near-field optical microscopy

Strategies for Potential Age Dating of Fingerprints through the Diffusion of Sebum Molecules on a Non-porous Surface

July 17, 2015

Author(s)

Shinichiro Muramoto, Edward Sisco

Age dating of fingerprints can have a significant impact in forensic science, as it has the potential to facilitate the judicial process by assessing the relevance of a fingerprint found in a crime scene. However, no reliable method currently exists that

Mass spectrometry of analytical derivatives. 1. Cyanide cations in the spectra of N-alkyl-N-perfluoroacyl-alpha-amino acids and their methyl esters

July 15, 2015

Author(s)

Nino G. Todua, Kirill V. Tretyakov, Anzor I. Mikaia

The central mission for the development of the NIST/NIH/EPA mass spectral library (The Library) is the acquisition of reference GC-MS data for important compounds and their chemical modification products 1. Addition of reliable reference data of various

NIST Backscattering-Correction-Factor Database for Auger Electron Spectroscopy, Version 1.1 of SRD 154

July 1, 2015

Author(s)

Cedric J. Powell, Aleksander Jablonski

This database provides backscattering correction factors of homogeneous solids for quantitative surface analyses by Auger electron spectroscopy.

On the feasibility of Raman spectroscopy as a continuous off-line detection method for size- exclusion chromatography and related techniques

July 1, 2015

Author(s)

Leena M. Pitkanen, Aaron A. Urbas, Andre Striegel

Examined here is the feasibility of employing Raman spectroscopy as a detection method in size- exclusion chromatography (SEC) and related macromolecular separations, for the purposes of determining the chemical heterogeneity of copolymers. To this effect

Unexpected Changes in Functionality and Surface Coverage for Au Nanoparticle PEI Conjugates: Implications for Stability and Efficacy in Biological Systems

June 26, 2015

Author(s)

Tae Joon Cho, John M. Pettibone, Justin M. Gorham, Thao M. Nguyen, Robert I. MacCuspie, Julien C. Gigault, Vincent A. Hackley

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