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Physics

Spectroscopy

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Displaying 876 - 900 of 911

Excited States at Surfaces: Fano Profiles in STM Spectroscopy of Adsorbates

March 1, 2000
Author(s)
John William Gadzuk, M Plihal
The Fano-Anderson model for a discrete state embedded within a continuum is revisited within the context of excitation and decay processes which lead to some manifestations of Fano lineshape profiles. The phenomenon of resonance tunneling between an STM

Raman Intensity Calibration With Glass Luminescence Standards

January 1, 2000
Author(s)
E S. Etz, Wilbur S. Hurst, Steven J. Choquette
This Paper describes the NIST development of standards and procedures for the calibration of the Raman Spectral Intensity. The work is based on the NIST proposal of the use of luminescent glass standards for the transfer of the white light calibration to

Dynamical Diffraction and X-Ray Standing Waves from Atomic Planes Normal in a Twofold Symmetry Axis of the Quasicrystal A1PdMn

April 1, 1999
Author(s)
Terrence J. Jach, Yanbao Zhang, R. Colella, M. De Boissieu, M. Boudard, A. I. Goldman, T Lograsso, D W. Delaney, S. Kycia
We have observed dynamical diffraction in the [024024] and[046046] reflections of the icosahedral quasicrystal A1PdMn in the back-reflection geometry (θ B = 90 ). The x-ray fluorescence from the Al and Pd atoms exhibits strong standing wave behavior

Vibrationally-Resolved Sum-Frequency Generation With Broad Bandwidth Infrared Pulses

October 15, 1998
Author(s)
Lee J. Richter, T Petralli-Mallow, John C. Stephenson
We present a novel procedure for vibrationally-resolved sum-frequency generation (SFG) in which a broad-bandwidth IR pulse is mixed with a narrow-bandwidth visible pulse. The resultant SFG spectrum is dispersed with a spectrograph and detected in parallel

Exploration of the Structural Environment of the Iron-Sulfur Cluster in Putidaredoxin by Nitrogen-15 NMR Spectroscopy of Selectively Labeled Cysteine Residues

August 28, 1998
Author(s)
Fahriye N. Sari, Marcia J. Holden, M P. Mayhew, V L. Vilker, B Coxon
Putidaredoxin is a di-iron protein whose paramagnetic region is not well characterized by 1H detected NMR. We have studied the structure of this region in greater detail by directly observed 15N NMR of oxidized and reduced putidaredoxin preparations in

Critically Assessed Tables of Atomic Spectroscopy Data

November 30, 1997
Author(s)
Wolfgang L. Wiese
The major NIST atomic spectroscopy data tables and the new NIST atomic spectra database (ASD) on the Internet are briefly reviewed. The need for critical assessments of atomic transition probabilities data is discussed, and the still unsatisfactory data
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