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Physics

Atomic / Molecular / Quantum

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Displaying 651 - 675 of 702

Intermolecular Potential and Second Virial Coefficient of the Water-Hydrogen Complex

January 1, 2004
Author(s)
M P. Hodges, R J. Wheatley, G K. Schenter, Allan H. Harvey
We construct a rigid-body (5-dimensional) potential-energy surface for the water-hydrogen complex using scaled perturbation theory (SPT). An analytic fit of this surface is obtained, and using this, two minima are found: the global miniumum has C 2v

Atoms on Demand: Fast, Deterministic Production of Single Cr Atoms

May 5, 2003
Author(s)
S Hill, Jabez J. McClelland
We have realized a method for producing single Cr atoms on demand by suppressing the stochastic nature of the loading and loss processes of a magneto-optic trap. We observe single-atom trap occupation probabilities as high as (98.7 plus or minus} 0.1)% and

Laboratory Astrophysics Survey of Key X-Ray Diagnostic Lines Using a Microcalorimeter on an Electron Beam Ion Trap

September 1, 2000
Author(s)
E Silver, H. Schnopper, Simon R. Bandler, N Brickhouse, S Murray, M Barbera, E Takacs, John D. Gillaspy, James V. Porto, I Kink, J M. Laming, N. Madden, D Landis, J. Beeman, E. E. Haller
Cosmic plasma conditions created in an Electron Beam Ion Trap (EBIT) make it possible to simulate the dependencies of Key diagnostic x-ray lines on density, temperature, and excitation conditions that exist in astrophysical sources. We used a

Magneto-Optical Trapping of Chromium Atoms

May 1, 2000
Author(s)
C Bradley, Jabez J. McClelland, W Anderson, Robert Celotta
We have constructed a magneto-optical trap for chromium atoms. Using trapping light at 425 nm and two repumping lasers tuned to intercombination transitions, over 10 6 atoms were trapped and average densities of over 10 16 m -3 were obtained. Non

Atomic Physics in Ion Traps

March 1, 1997
Author(s)
C Monroe, John Bollinger
Ion traps allow researchers to control the position and movement of charged particles with exquisite precision, and provide a powerful way to study many atomic phenomena.

Laser Collimation of a Chromium Beam

February 1, 1997
Author(s)
R E. Scholten, R Gupta, Jabez J. McClelland, Robert Celotta, M Levenson, M Vangel
We have studied laser collimation of a chromium atomic beam using a transverse polarization gradient cooling scheme. We present detailed measurements of the angular distribution of atoms on the beam axis, over a broad range of laser intensities and

Local-density-functional calculations of the Energy of Atoms

January 1, 1997
Author(s)
Svetlana A. Kotochigova, Zachary H. Levine, Eric L. Shirley, Mark D. Stiles, Charles W. Clark
The total energies of atoms and with atomic number Ζ from 1 to 92 and singly-charge cations with Ζ from 2 to 92 have been calculated to an accuracy of 1 υHartree within four variants of the Kohn-Sham local-density approximation. The approximations

Spin-resolved Superelastic Electron Scattering from Laser Excited Chromium Atoms

November 14, 1993
Author(s)
G Hanne, Jabez J. McClelland, R E. Scholten, Robert Celotta
Superelastic scattering of polarized electrons from laser-excited polarized chromium atoms (4 7P o 4 rarr} 4 7S 3 transition, energy gain 2.92 eV) has been measured for total collision energies of 6.8 and 13.6 eV (0.5 and 1.0 Ryd) and scattering angles

Uncertainty Intervals for Polarized Beam Scattering Asymmetry Statistics

July 1, 1993
Author(s)
Kevin Coakley, Jabez J. McClelland, Michael H. Kelley, Robert Celotta
In many scattering experiments, the quantity of most direct physical interest is a measure of the difference between two closely related scattering signals, each generated by a Poisson scattering process. This difference is often expressed in terms of an

Spin-Resolved Elastic Scattering of Electrons from Sodium

April 1, 1993
Author(s)
Steven R. Lorentz, R E. Scholten, Jabez J. McClelland, Michael H. Kelley, Robert Celotta
Angle-resolved ratios of the separate triplet and singlet spin channel cross sections have been measured for elastic scattering of spin-polarized electrons from optically pumped spin-polarized sodium atoms. The triplet-to-singlet ratios axe reported at

Scattering of Polarized Electrons from Optically Pumped Sodium Atoms

January 1, 1992
Author(s)
Michael H. Kelley, Jabez J. McClelland, Steven R. Lorentz, R E. Scholten, Robert Celotta
We have measured the spin-dependence for elastic and superelastic scattering of spin-polarized electrons from optically prepared sodium atoms at selected incident energies from 1.0 to 54.4 eV and for scattering angles ranging from 10-degrees to 140-degrees

Spin-Resolved Elastic Scattering of Electrons from Sodium Below the Inelastic Threshold

December 30, 1991
Author(s)
Steven R. Lorentz, R E. Scholten, Jabez J. McClelland, Michael H. Kelley, Robert Celotta
A very stringent test of low-energy electron-atom collision theory is made in the most favorable energy regime for the close-coupling approximation. Data are presented as exchange asymmetries in angle-resolved elastic scattering of spin-polarized electrons

Spin-resolved Superelastic Scattering from Sodium at 10 and 40 eV

December 28, 1991
Author(s)
R E. Scholten, Steven R. Lorentz, Jabez J. McClelland, Michael H. Kelley, Robert Celotta
Spin-resolved superelastic electron scattering from sodium has been measured at total energies of 10 and 40 eV, for scattering angles between 10° and 140°. The angular momentum transfer, Lperp}, and the spin-resolved components L(Tperp} and L(S)perp} have
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