The structural properties of alkali metal atoms doped noble gas clusters

2007 ◽  
Vol 76 (3) ◽  
pp. 607-611 ◽  
Author(s):  
Artur Stasikowski ◽  
Marek Moneta ◽  
Tomasz M. Gwizdałła
Keyword(s):  
Alkali Metal ◽  
Structural Properties ◽  
Noble Gas ◽  
Metal Atoms ◽  
Gas Clusters

scholarly journals A Synchronous Spin-Exchange Optically Pumped NMR-Gyroscope

2020 ◽  
Vol 10 (20) ◽  
pp. 7099
Author(s):  
Susan S. Sorensen ◽  
Daniel A. Thrasher ◽  
Thad G. Walker
Keyword(s):  
Alkali Metal ◽  
Noble Gases ◽  
Spin Exchange ◽  
Noble Gas ◽  
Navigation Systems ◽  
Optically Pumped ◽  
Orientation Measurement ◽  
Metal Atoms ◽  
Optically Pumped Nmr ◽  
Measurement Units

Inertial navigation systems generally consist of timing, acceleration, and orientation measurement units. Although much progress has been made towards developing primary timing sources such as atomic clocks, acceleration and orientation measurement units often require calibration. Nuclear Magnetic Resonance (NMR) gyroscopes, which rely on continuous measurement of the simultaneous Larmor precession of two co-located polarized noble gases, can be configured to have scale factors that depend to first order only on fundamental constants. The noble gases are polarized by spin-exchange collisions with co-located optically pumped alkali-metal atoms. The alkali-metal atoms are also used to detect the phase of precession of the polarized noble gas nuclei. Here we present a version of an NMR gyroscope designed to suppress systematic errors from the alkali-metal atoms. We demonstrate rotation rate angle random walk (ARW) sensitivity of 16μHz/Hz and bias instability of ∼800 nHz.

STRUCTURAL PROPERTIES OF ALKALI-METAL ATOMS ADSORBED ON Ru(0001)

1995 ◽  
Vol 02 (03) ◽  
pp. 409-422 ◽  
Author(s):  
H. OVER ◽  
H. BLUDAU ◽  
M. GIERER ◽  
G. ERTL
Keyword(s):  
Alkali Metal ◽  
Structural Properties ◽  
Energy Cost ◽  
Hard Sphere ◽  
Energy Difference ◽  
Singular Behavior ◽  
Adsorption Sites ◽  
Metal Atoms ◽  
Substrate Surfaces

The structural properties of the ordered overlayers of Li, Na, K, Rb , and Cs on Ru (0001) are summarized. The major result is that the adsorption site depends on the coverage while the hard-sphere radii of the alkali-metal atoms do not change (if corrected for different numbers of coordination). This comparison also emphasizes the singular behavior of Cs for which adsorption takes place over single Ru atoms at a Cs coverage of 0.25. While on other close-packed substrate surfaces potassium and rubidium occupy ontop positions at low temperatures, this has not been found with Ru (0001). This finding points towards the important role of the substrate. For the ontop adsorption to be favored, an inward displacement of the substrate atoms directly underneath the alkali-metal atoms by a substantial amount is necessary which results in the formation of a quasisevenfold-coordinated bond geometry in connection with a reduction of the dipole-dipole repulsion. The stiffness of the substrate determines the energy cost for this local reconstruction, and consequently ontop adsorption on the hard Ru (0001) substrate has only been observed for the biggest alkali metal Cs where the energy difference between various adsorption sites [on the unrelaxed Ru (0001) surface] is assumed to be small. In order to force potassium to reside in the ontop position, the Ru (0001) surface has to be “softened” which task was accomplished by adding CO molecules to the K-(2×2) overlayer.

Polarization of the nuclear spins of noble-gas atoms by spin exchange with optically pumped alkali-metal atoms

1984 ◽  
Vol 29 (6) ◽  
pp. 3092-3110 ◽  
Author(s):  
W. Happer ◽  
E. Miron ◽  
S. Schaefer ◽  
D. Schreiber ◽  
W. A. van Wijngaarden ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Spin Exchange ◽  
Noble Gas ◽  
Nuclear Spins ◽  
Optically Pumped ◽  
Metal Atoms

Measurements of electric dipole polarizabilities of the alkali-metal atoms and the metastable noble-gas atoms

1974 ◽  
Vol 10 (4) ◽  
pp. 1131-1140 ◽  
Author(s):  
Robert W. Molof ◽  
Henry L. Schwartz ◽  
Thomas M. Miller ◽  
Benjamin Bederson
Keyword(s):  
Alkali Metal ◽  
Electric Dipole ◽  
Noble Gas ◽  
Metal Atoms ◽  
Dipole Polarizabilities
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