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Topic Area: Atomic Physics
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Displaying records 11 to 20 of 79 records.
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11. 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 ...

12. 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 ...

13. 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 ...

14. 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 ...

15. 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 ...

16. Cross-validation of microfabricated atomic magnetometers with SQUIDs for biomagnetic applications
Topic: Atomic Physics
Published: 9/28/2010
Authors: Svenja A Knappe, Tillman H. Sander, Olaf Kosch, Frank Wiekhorst, John E Kitching, Lutz Trahms
Abstract: A chip-scale atomic magnetometer (CSAM) is compared with a superconducting quantum interference devices (SQUID) sensor in two biomedical applications. CSAMs are magnetic field sensors that operate at room temperature and are based on spectroscopy of ...

17. Creation and manipulation of Feshbach resonances with radio-frequency radiation
Topic: Atomic Physics
Published: 8/12/2010
Authors: Thomas Mark Hanna, Eite Tiesinga, Paul S Julienne
Abstract: We present a simple technique for studying collisions of ultracold atoms in the presence of a magnetic field and radio-frequency radiation (rf ). Resonant control of scattering properties can be achieved by using rf to couple a colliding pair o ...

18. Low-Frequency Characterization of MEMS-Based Portable Atomic Magnetometer
Topic: Atomic Physics
Published: 6/2/2010
Authors: Rahul Ramdas Mhaskar, Svenja A Knappe, John E Kitching
Abstract: Atomic magnetometers based on absorption or polarization rotation of light in an alkali vapor have recently demonstrated sensitivities rivaling those of superconducting quantum interference devices (SQUIDs). Miniaturization of such devices containing ...

19. Number Enhancement for Compact Laser-Cooled Atomic Samples by use of Stimulated Radiation Forces
Topic: Atomic Physics
Published: 6/2/2010
Authors: Elizabeth A Donley, Tara C. Liebisch, Eric Michael Blanshan, John E Kitching
Abstract: For cold samples of laser-cooled atoms to be most useful in emerging technologies such as compact atomic clocks and sensors, it is necessary to achieve small sample sizes while retaining a large number of cold atoms. We consider achieving large atom ...

20. Towards a compact cold atom frequency standard based on coherent populatoin trapping
Topic: Atomic Physics
Published: 6/2/2010
Authors: Francois-Xavier R. Esnault, Elizabeth A Donley, John E Kitching
Abstract: We describe in this paper the main features of a cold atom CPT based frequency standard. We explain our particular CPT configuration and our experimental setup. as well as present simulations of the expected performance (stability and major systemati ...

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