An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
We describe the calculation of hydrogenic (one-loop) Bethe logarithms for all states with principal quantum numbers n 200. While the calculation of the Bethe
Keith R. Lykke, Ping-Shine Shaw, J L. Dehmer, R Gupta
We have made direct measurements of the internal quantum efficiency and the reflectivity of UV-damaged silicon photodiodes in the spectral range of 120 nm to
The use of optical frequencies in measurement science has been proposed and practiced since the very early days of the invention of lasers. Comparison of a
Vortices are robust, particle-like excitations which occur in a variety of fluids. A tell-tale characteristic of superfluids is the existence only of vortices
A formalism is introduced to describe a number of physical processes that may break down the coherence of a matter wave over a characteristic length scale l. In
Leticia Pibida, C A. McMahon, W Nortershauser, B A. Bushaw
The performance of the Resonance Ionization Mass Spectrometry (RIMS) system at the National Institute of Standards and Technology (NIST) has been compared to a
We study a quantum teleportation scheme between two nanomechanical modes without local interaction. The nanomechanical modes are linearly coupled to and
This collection of papers constitutes ath proceedings of the sixth International colloquium on Atomic Spectra and oscillator strengths, encompassing all invited
Branching fractions for neutral holmium have been measured with FT spectrometry. Hyperfine structure patterns have been analyzed using a modified Xgremlin
Ernest G. Kessler Jr., Maynard S. Dewey, R Deslattes, Albert Henins, H G. Borner, M Jentschel, H Lehmann
The extension of accurate crystal diffraction spectroscopy to the 2 to 6 MeV region is described. Gamma-ray standards with a relative uncertainty of (2 to 5)x10
A system designed to apply Fabry-Perot interferometry to the measurement of displacements is described. Two adjacent modes of a Fabry-Perot cavity are probed
We present quantiative calculations of binary collision parameters for mixtures of ultracold gases of 85Rb and 87Rb atoms. The elastic cross section for pure
Mikkel Andersen, Changhyun Ryu, Pierre Clade, Vasant Natarajan, A Vaziri, Kristian Helmerson, William D. Phillips
Light can carry two kinds of angular momentum: Spin angular momentum (SAM) associated with its polarization and orbital angular momentum (OAM) associated with
A miniature Fouier transform (FT0 spectrometer was evaluated as a device for remotely measuring the temperature of a high stability/emissivity blackbody. The
We describe a procedure for creating pairs of condensates with appreciable relative number squeezing. We show that our procedure is relatively robust against
Laboratory Experiments refers generally to active spaceborne experiments as opposed to the equally important passive observation in space of signals coming from
rth climate modeling and global impacts of particles and gases in the atmosphere are some of the studies that benefit from the use of spectroradiometers
Recently, quantized versions of random walks have been explored as effective elements for quantum algorithms. In the simplest case of one dimension, the theory
We discuss the application of the Discrete Variable Representation to Schr dinger problems which involve singular Hamiltonians. Unlike recent authors who invoke
We introduce a novel broadband optical frequency comb generator consisting of a parametric oscillator with an intracavity electro-optic phase modulator. The
The irradiance diffraction profile of a straight edge is given as a Taylor series in powers of the distance from the geometrical shadow boundary to any point in
Surface effects significantly influence the functionality of semiconductor nanocrystals. A theoretical understanding of these effects requires an atomic-scale
The impact of the Guide to Expression of Uncertainty in Measurement is spreading from the national measurement institutes to the industrial measurement
E N. Karyakin, Gerald T. Fraser, J G. Loeser, R J. Saykally
The millimeter and submillimeter-wave molecular-beam spectrum of the perdeuterated ammonia dimer (ND3)2 has been measured between approximately 50 GHz and 400
Atomic-scale effects on electronic coupling in coupled quantum dots are studied. The empirical tight-binding approach is used to obtain the electronic structure
We observed the spectrum of neutral krypton (Kr I) in its naturally occurring isotopic mixture as emitted by a microwave-excited electrodeless discharge lamp
A new theoretical approach for treating the synchrotron radiation is applied to the case of a relativistic charged particle accelerated by a confined and
A Raman-scattering investigation of the double-layer manganites, La 2-2rSr 1+2rMn 2O 7 (x= 0.4,0.5), revealed signatures of a ) charge stripe formation and