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Physics

Spectroscopy

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Displaying 726 - 750 of 927

Certification of NIST Standard Reference Material 640d

June 1, 2010
Author(s)
David R. Black, Donald A. Windover, Albert Henins, David L. Gil, James J. Filliben, James P. Cline
The National Institute of Standards and Technology (NIST) certify a variety of standard reference materials (SRM) to address specific aspects of instrument performance for divergent beam diffractometers. This report describes SRM 640d, the fifth generation

Third-Order Intermodulation Distortion due to Self-heating in Gold Coplanar Waveguides

May 23, 2010
Author(s)
Eduard Rocas, Juan C. Collado Gomez, Nathan D. Orloff, James C. Booth
We present measurements and modeling of a self-heating mechanism responsible for third order intermodulation distortion in coplanar waveguide transmission lines. Temperature fluctuations, at the envelope frequency of the input signal, induce dynamic

Dual frequency-comb sampling of a quasi-thermal incoherent light source

May 1, 2010
Author(s)
Fabrizio R. Giorgetta, Ian R. Coddington, William C. Swann, Esther Baumann, Nathan R. Newbury
Dual, coherent frequency combs are used to measure the spectrum of an incoherent, quasi-thermal source through Fourier spectroscopy. The source spectrum is acquired over 1THz bandwidth with an absolute frequency accuracy set by the combs.

Metrology of Molecular Devices made by Flip Chip Lamination

April 30, 2010
Author(s)
Christina A. Hacker, Mariona Coll Bau, Curt A. Richter
Scaling of conventional electronics has continued unabated to dimensions approaching fundamental physical limits. As technology continues to evolve there are increasing demands to identify alternate routes of performing electrical functions. One potential

Direct Observation of Coherent Population Trapping in a Superconducting Artificial Atom

April 20, 2010
Author(s)
David P. Pappas, Jeffrey S. Kline, Willim R. Kelley, Zachary Dutton, Thomas A. Ohki, john Schlafer, Bashkar Mookerji
The phenomenon of coherent population trapping (CPT) of an atom (or solid state artificial atom ), and the associated effect of electromagnetically induced transparency (EIT), are clear demonstrations of quantum interference due to coherence in multilevel

The A 2E" - X 2A2' Transition of NO 3 Trapped in Solid Neon

April 7, 2010
Author(s)
Marilyn E. Jacox, Warren E. Thompson
NO3 has been stabilized in a neon matrix at 4.3 K in sufficient yield for detection of the absorptions between 7000 and 10000 cm-1 which arise from vibronically allowed transitions from its ground state to levels of the A 2E" state. The results confirm and

Raman spectroscopic observation of dehydrogenation in ball-milled LiNH2-LiBH4-MgH2 nanoparticles

April 3, 2010
Author(s)
Jason Hattrick-Simpers, Chun Chiu, James E. Maslar, Leonid A. Bendersky, Michael E. Niemann, Sesha S. Srinivasan, Elias K. Stefanakos
In situ Raman spectroscopy was used to monitor the dehydrogenation of ball-milled mixtures of LiNH2 LiBH4 MgH2 nanoparticles. The as-milled powders were found to contain a mixture of Li4BN3H10 and Mg(NH2)2, with no evidence of residual LiNH2 or LiBH4. It

Sensitivity of coherent dual-comb spectroscopy

March 31, 2010
Author(s)
Nathan R. Newbury, Ian R. Coddington, William C. Swann
Coherent dual comb spectroscopy can provide high-resolution, high-accuracy measurements of a sample response in both magnitude and phase. We discuss the achievable signal-to-noise ratio (SNR) due to both additive white noise and multiplicative noise, and

Symmetry and Fourier analysis of the ab-initio-determined torsional variation of structural and Hessian-related quantities for application to vibration-torsion-rotation interactions in CH3OH

January 11, 2010
Author(s)
Li-Hong Xu, Jon T. Hougen, Jonathan M. Fisher, Ronald M. Lees
The aim of the present paper is to investigate the use of quantum chemistry calculations to obtain the torsional dependence of various structural and vibrational-force-field-related quantities that could help in estimating the vibration-torsion-rotation
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