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Topic Area: Atomic Physics

Displaying records 11 to 20 of 85 records.
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11. Charge state dependent energy deposition by ion impacts
Topic: Atomic Physics
Published: 8/5/2011
Authors: Russell Lake, Joshua M Pomeroy, Holger Grube, C E Sosolik
Abstract: We report on a measurement of craters in thin dielectric films formed by XeQ+ (26  Q  44) projectiles. Tunnel junction devices with ion-irradiated barriers were used to amplify the effect of charge-dependent cratering through the exponential depend ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908452

12. Critical capture distances for highly charged ions above dielectric covered metal surfaces
Topic: Atomic Physics
Published: 6/1/2011
Authors: Russell Lake, Joshua M Pomeroy, C E Sosolik
Abstract: We model the first stage of the electronic interaction between an ion and a metal surface covered with a thin dielectric layer. Specifically, we seek to answer two questions. (i) As an ion approaches the surface from far away, does the first electron ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907439

13. Measurement of equilibrium elemental vapor pressures using x-ray induced fluorescence
Topic: Atomic Physics
Published: 3/22/2011
Authors: John J Curry, Albert Henins, E. G Estupinan, W. P. Lapatovich, S. D. Shastri
Abstract: X-ray induced fluorescence is demonstrated as a fast and accurate method for measuring elemental vapor pressures over a wide range of pressures. As such, it may offer a preferable alternative to existing methods such as those based on effusion. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905739

14. Fe xvii X-ray Line Ratios for Accurate Astrophysical Plasma Diagnostics
Topic: Atomic Physics
Published: 2/20/2011
Authors: John D Gillaspy, E. H. Silver, L. Tedesco, Joseph N Tan, Joshua M Pomeroy, J M Laming, G.-X. Chen, T. Lin
Abstract: New laboratory measurements of the Ne-like Fe xvii x-ray lines in the 15-17 Angstrom range are presented, along with new theoretical predictions. These results establish consistency between independent laboratories and opens the door to trustworthy ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903971

15. Spherical Reference Cavities for Ultra-Stable Lasers in Non-Laboratory Environments
Topic: Atomic Physics
Published: 2/14/2011
Authors: David R Leibrandt, Michael J. (Michael) Thorpe, Mark Notcutt, Robert E. Drullinger, Till P Rosenband, James C Bergquist
Abstract: We present an ultra-stable optical cavity design that is insensitive to both vibrations and orientation. The design is based on a spherical cavity spacer which is held rigidly at two points on a diameter of the sphere. Coupling of the support force ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907288

16. Use of Phosphor Image Plates for Measuring Intensities in Vacuum Ultraviolet Spectra
Topic: Atomic Physics
Published: 1/28/2011
Authors: Gillian Nave, Craig J Sansonetti, Csilla Szabo, John J Curry, Darren Smillie
Abstract: We describe the use of phosphor image plates for recording spectra in the vacuum ultraviolet (VUV) and for determining accurate relative and absolute intensities. We investigated the spatial uniformity, noise level, linearity of the response to VUV ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905893

17. Cold light from hot atoms
Topic: Atomic Physics
Published: 1/1/2011
Authors: John J Curry, G G Lister
Abstract: The introduction of rare earth atoms and molecules into lighting discharges led to great advances in efficacy of these lamps. Atoms such as Dy, Ho and Ce provide excellent radiation sources for lighting applications1, with strong radiation bands in ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907402

18. Femtotesla atomic magnetometry in a microfabricated vapor cell
Topic: Atomic Physics
Published: 12/20/2010
Authors: William C. Griffith, Svenja A Knappe, John E Kitching
Abstract: We describe an optically pumped ^u87^Rb magnetometer with 4.5 fT/Hz^u1/2^ sensitivity when operated in the spin-exchange relaxation free (SERF) regime. The magnetometer uses a microfabricated vapor cell, consisting of a cavity etched in a 1 mm thick ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906531

19. Progress at NIST in measuring the D-lines of Li isotopes using an optical frequency comb
Topic: Atomic Physics
Published: 12/20/2010
Authors: Clayton Simien, Samuel Middleton Brewer, Joseph N Tan, John D Gillaspy, Craig J Sansonetti
Abstract: Precise spectroscopic experiments with light atoms can provide information about nuclear properties that are very difficult to obtain in electron scattering experiments. For example, relative nuclear radii of low-Z isotopes can be determined accurat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906251

20. Far-ultraviolet signatures of the 3He(n,tp) reaction in noble gas mixtures
Topic: Atomic Physics
Published: 12/8/2010
Authors: Patrick Hughes, Alan K Thompson, Michael Coplan, Robert Edward Vest, Charles W Clark
Abstract: Previous work showed that the 3He(n,tp) reaction in a cell of 3He at atmospheric pressure generated tens of far-ultraviolet photons per reacted neutron. Here we report amplification of that signal by factors of 1000 and more when noble gases are adde ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906674



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