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Displaying records 81 to 90 of 273 records.
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81. Infrared Spectra of Products of the Reaction of H Atoms with O2 Trapped in Solid Neon. HO2, HO2+, HOHOH-, and H2O(HO)
Topic: Physics
Published: 12/7/2012
Authors: Marilyn E Jacox, Warren Elwin Thompson
Abstract: When a Ne:O2 mixture is codeposited at 4.3 K with a Ne:H2 mixture that has been passed through a microwave discharge, the infrared spectrum of the resulting deposit includes prominent absorptions of the three vibrational fundamentals of HO2 and seven ...

82. Single bead detection with a NMR micro capillary probe
Topic: Physics
Published: 12/6/2012
Authors: Yoshihiro (Yoshihiro) Nakashima, Michael A Boss, Stephen E Russek, John M Moreland
Abstract: We have developed a nuclear magnetic resonance (NMR) microcapillary probe for the detection of single magnetic microbeads. The geometry of the probe has been optimized so that the signal from the background water has a similar magnitude compared to t ...

83. In Search of a New Primary GPS Receiver for NIST
Topic: Physics
Published: 11/26/2012
Author: Marc Abbott Weiss
Abstract: A previous publication showed problems with the current NIST Time and Frequency Division primary GPS receiver [1] when used for Precise Point Positioning (PPP)-based carrier phase time transfer. We confirm that, for this receiver, boundary discontinu ...

84. Infrared hemispherical reflectance of carbon nanotube mats and arrays in the 5 µm to 50 µm wavelength region
Topic: Physics
Published: 11/1/2012
Authors: Chris Chunnilall, Aric Warner Sanders, John H Lehman, Evangelos Theocharous
Abstract: We present the absolute infrared (5 {u}m to 50 {u}m) hemispherical reflectance of films produced from commercially available carbon nanotubes. Data were obtained using the upgraded NPL directional- hemispherical reflectance measurement facility. A b ...

85. Interstellar Carbodiimide (HNCNH) - A New Astronomical Detection from the GBT PRIMOS Survey via Maser Emission Features
Topic: Physics
Published: 10/1/2012
Authors: Brett A. McGuire, Ryan A. Loomis, Cameron M. Charness, Geoffery A. Blake, Jan M. Hollis, Francis John Lovas, Philip R. Jewell, Anthony J. Remijan
Abstract: Historically, searches for new astronomical molecules resulted in the detection of favorable, high line strength transitions based on a thermal approximation to the excitation of these species in interstellar environments. Given the temperatures of ...

86. Multiexciton dynamics in infrared-emitting colloidal nanostructures probed by a superconducting nanowire single-photon detector
Topic: Physics
Published: 9/30/2012
Authors: Richard L Sandberg, Lazaro A. Padilha, Mumtaz Qazilbash, Wan Ki Bae, Richard D. Schaller, Jeffrey M. Pietryga, Martin J Stevens, Burm Baek, Sae Woo Nam, Victor I. Klimov
Abstract: Carrier multiplication (CM) is the process in which absorption of a single photon produces multiple electron-hole pairs. Here, we evaluate the effect of particle shape on CM efficiency by conducting a comparative study of spherical nanocrystal qu ...

87. Performance of the NIST goniometer with a broad-band source and multichannel CCD based spectrometer
Topic: Physics
Published: 9/20/2012
Authors: Vyacheslav B Podobedov, Maria E Nadal, Carl C Miller

88. Zero-energy modes and gate-tunable gap in graphene on hexagonal boron nitride
Topic: Physics
Published: 9/13/2012
Authors: Markus Kindermann, Bruno Uchoa, David L. Miller
Abstract: In this article, we derive an effective theory of graphene on a hexagonal boron nitride (h-BN) substrate. We show that the h-BN substrate generically opens a spectral gap in graphene despite the lattice mismatch. The origin of that gap is particularl ...

89. Ultrafast manetization enhancement in metallic multilayers driven by superdiffusive spin current
Topic: Physics
Published: 9/4/2012
Authors: Thomas J Silva, Justin M Shaw, Hans Toya Nembach, Dennis Rudolf, Chan La-O-Vorakiat, Marco Battiato, Roman Adam, Emrah Turgut, Stefan Mathias, Margaret M. Murnane, Henry C. Kapteyn, Claus M. Schneider
Abstract: Uncovering the physical mechanisms that govern ultrafast charge and spin dynamics is crucial for understanding correlated matter as well as the fundamental limits of ultrafast spin-based electronics. Spin dynamics in magnetic materials can be driven ...

90. Determination of graphene work function and graphene-insulator-semiconductor band alignment by internal photoemission spectroscopy
Topic: Physics
Published: 7/11/2012
Authors: Rusen Yan, Qin Q. Zhang, Wei Li, Irene G. Calizo, Tian T. Shen, Curt A Richter, Angela R Hight Walker, Xuelei X. Liang, David J Gundlach, Nhan V Nguyen, Huili Grace Xing, Alan Seabaugh
Abstract: We determined the band alignment of a graphene-oxide-silicon structure using internal photoemission spectroscopy. From the flatband voltage and Dirac voltage we infer a 4.3  10e11 cm-2 negative extrinsic charge present on the graphene surface. Als ...

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