scholarly journals Direct detection of neutral metal atoms in electron-stimulated desorption: Al from CH{sub 3}O/Al(111) - velocity distribution and absolute yield

1994 ◽  
Author(s):  
J.E. Whitten ◽  
C.E. Young ◽  
M.J. Pellin ◽  
D.M. Gruen ◽  
P.L. Jones
Keyword(s):  
Velocity Distribution ◽  
Direct Detection ◽  
Absolute Yield ◽  
Metal Atoms ◽  
Electron Stimulated Desorption ◽  
Neutral Metal

scholarly journals The intensification of metallic layered phenomena above thunderstorms through the modulation of atmospheric tides

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Bingkun Yu ◽  
Xianghui Xue ◽  
Chengling Kuo ◽  
Gaopeng Lu ◽  
Christopher J. Scott ◽  
...  
Keyword(s):  
Lower Ionosphere ◽  
Atmospheric Tides ◽  
Metallic Ions ◽  
Number Density ◽  
Mesopause Region ◽  
Lidar Observation ◽  
Metal Atoms ◽  
Chemical Coupling ◽  
Coupling Processes ◽  
Neutral Metal

AbstractWe present a multi-instrument experiment to study the effects of tropospheric thunderstorms on the mesopause region and the lower ionosphere. Sodium (Na) lidar and ionospheric observations by two digital ionospheric sounders are used to study the variation in the neutral metal atoms and metallic ions above thunderstorms. An enhanced ionospheric sporadic E layer with a downward tidal phase is observed followed by a subsequent intensification of neutral Na number density with an increase of 600 cm−3 in the mesosphere. In addition, the Na neutral chemistry and ion-molecule chemistry are considered in a Na chemistry model to simulate the dynamical and chemical coupling processes in the mesosphere and ionosphere above thunderstorms. The enhanced Na layer in the simulation obtained by using the ionospheric observation as input is in agreement with the Na lidar observation. We find that the intensification of metallic layered phenomena above thunderstorms is associated with the atmospheric tides, as a result of the troposphere-mesosphere-ionosphere coupling.

Photon and electron-stimulated desorption of excited alkali-metal atoms and CN molecules from alkali halide surfaces

1994 ◽  
Vol 128 (1-2) ◽  
pp. 135-149 ◽  
Author(s):  
S. Vijayalakshmi ◽  
D. Liu ◽  
J. Xu ◽  
N. Seifert ◽  
D. J. McClure ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Alkali Halide ◽  
Metal Atoms ◽  
Electron Stimulated Desorption

Direct detection of a metal desorption channel: electron-stimulated desorption of aluminum from methanol-dosed Al(111)

1993 ◽  
Vol 282 (1-2) ◽  
pp. A200
Author(s):  
J.E. Whitten ◽  
C.E. Young ◽  
M.J. Pellin ◽  
D.M. Gruen ◽  
P.L. Jones
Keyword(s):  
Direct Detection ◽  
Electron Stimulated Desorption

scholarly journals Implications of hydrodynamical simulations for the interpretation of direct dark matter searches

2017 ◽  
Vol 32 (21) ◽  
pp. 1730016 ◽  
Author(s):  
Nassim Bozorgnia ◽  
Gianfranco Bertone
Keyword(s):  
Dark Matter ◽  
Velocity Distribution ◽  
Milky Way ◽  
Direct Detection ◽  
Solar Neighborhood ◽  
Reliable Estimate ◽  
The Status ◽  
Hydrodynamical Simulations ◽  
The Impact ◽  
Direct Dark Matter

In recent years, realistic hydrodynamical simulations of galaxies like the Milky Way have become available, enabling a reliable estimate of the dark matter density and velocity distribution in the Solar neighborhood. We review here the status of hydrodynamical simulations and their implications for the interpretation of direct dark matter searches. We focus in particular on: the criteria to identify Milky Way-like galaxies; the impact of baryonic physics on the dark matter velocity distribution; the possible presence of substructures like clumps, streams, or dark disks; and on the implications for the direct detection of dark matter with standard and nonstandard interactions.

scholarly journals Recasting direct detection limits within micrOMEGAs and implication for non-standard dark matter scenarios

2021 ◽  
Vol 81 (3) ◽  
Author(s):  
G. Bélanger ◽  
A. Mjallal ◽  
A. Pukhov
Keyword(s):  
Dark Matter ◽  
Elastic Scattering ◽  
Velocity Distribution ◽  
Cross Sections ◽  
Direct Detection ◽  
Cosmological Parameters ◽  
Form Factors ◽  
Scattering Cross ◽  
Upper Limits ◽  
Scattering Cross Sections

AbstractDirect detection experiments obtain 90% upper limits on the elastic scattering cross sections of dark matter with nucleons assuming point-like interactions and standard astrophysical and cosmological parameters. In this paper we provide a recasting of the limits from XENON1T, PICO-60, CRESST-III and DarkSide-50 and include them in micrOMEGAs. The code can then be used to directly impose constraints from these experiments on generic dark matter models under different assumptions about the DM velocity distribution or on the nucleus form factors. Moreover, new limits on the elastic scattering cross sections can be obtained in the presence of a light t-channel mediator or of millicharged particles.

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