Structural and Electronic Changes in the Growth of Mercury Overlayers on Cu(001): A Helium Beam Scattering, Leed and Arpes Study

1990 ◽  
Vol 187 ◽  
Author(s):  
G. Vidali ◽  
W. Li ◽  
P. A. Dowben ◽  
M. Karimi ◽  
C.W. Hutchings ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Surface Temperature ◽  
Electron Spectroscopy ◽  
High Density ◽  
Atom Beam ◽  
Preliminary Results ◽  
Bilayer Films ◽  
Ordered Phases ◽  
Beam Scattering ◽  
Arpes Data

AbstractWe used atom beam scattering (ABS), LEED and angle-resolved photo-electron spectroscopy (ARPES) to study bilayer films of Hg on Cu(001). In the surface temperature range of 180 to 330 K, the first Hg layer forms two ordered phases, a c(2×2) (with coverage=0.5 of Cu(001)) and a high density (partially commensurate) c(4×4) (coverage=0.62 ). ARPES data show that there is little or no dispersion of the 5d band of Hg. ABS data show that this layer is not flat, with in-registry Hg atoms lying about 0.15 below the not-in-registry Hg atoms. From ABS we find that the second layer forms a completely registered c(4times;4) phase. From ARPES we obtain that the second layer has an electronic structure, particularly the 5d levels, characteristic of bulk mercury.Preliminary results of calculations of the structure of the bilayer are given.

Ordering and Energetics of Hg Overlayers on Cu(O01)

1989 ◽  
Vol 159 ◽  
Author(s):  
C.W. Hutchings ◽  
P.A. Dowben ◽  
Y.J. Kime ◽  
W. Li ◽  
M. Karimi ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Diffraction Data ◽  
Isosteric Heat ◽  
The Other ◽  
Square Lattice ◽  
Atom Beam ◽  
Ordered Phases ◽  
Beam Scattering ◽  
Two Phases ◽  
Beam Diffraction

ABSTRACTThe growth, ordering, and energetics of Hg overlayers on Cu(O01) have been studied using atom beam scattering, LEED and angle-resolved photoemission. Two stable ordered phases have been identified: one phase is a c(2↑2) and the other phase is a higher density square lattice which has a coincidence c(4↑4) structure. A phase diagram has been determined using LEED and atom beam diffraction data for surface temperatures between 180 and 330 K. ABS data suggest out that there is a narrow coexistance region between these two phases. The isosteric heat of adsorption has been determined as a function of coverage.

High intensity copper atom beam ‐ preliminary results

1973 ◽  
Vol 44 (12) ◽  
pp. 1734-1740
Author(s):  
Arnold J. Kelly ◽  
Domenic Santavicca
Keyword(s):  
Copper Atom ◽  
High Intensity ◽  
Atom Beam ◽  
Preliminary Results

scholarly journals Quantifying the Effects of Urban Form on Land Surface Temperature in Subtropical High-Density Urban Areas Using Machine Learning

2019 ◽  
Vol 11 (8) ◽  
pp. 959 ◽  
Author(s):  
Yanwei Sun ◽  
Chao Gao ◽  
Jialin Li ◽  
Run Wang ◽  
Jian Liu
Keyword(s):  
Surface Temperature ◽  
Land Surface Temperature ◽  
Land Surface ◽  
Urban Form ◽  
Urban Areas ◽  
Thermal Environment ◽  
High Density ◽  
Cooling Effects ◽  
Urban Thermal Environment ◽  
The Impact

It is widely acknowledged that urban form significantly affects urban thermal environment, which is a key element to adapt and mitigate extreme high temperature weather in high-density urban areas. However, few studies have discussed the impact of physical urban form features on the land surface temperature (LST) from a perspective of comprehensive urban spatial structures. This study used the ordinary least-squares regression (OLS) and random forest regression (RF) to distinguish the relative contributions of urban form metrics on LST at three observation scales. Results of this study indicate that more than 90% of the LST variations were explained by selected urban form metrics using RF. Effects of the magnitude and direction of urban form metrics on LST varied with the changes of seasons and observation scales. Overall, building morphology and urban ecological infrastructure had dominant effects on LST variations in high-density urban centers. Urban green space and water bodies demonstrated stronger cooling effects, especially in summer. Building density (BD) exhibited significant positive effects on LST, whereas the floor area ratio (FAR) showed a negative influence on LST. The results can be applied to investigate and implement urban thermal environment mitigation planning for city managers and planners.

scholarly journals Nuclear Forces in High Density Matter

1971 ◽  
Vol 46 ◽  
pp. 356-363
Author(s):  
M. R. McNaughton
Keyword(s):  
Neutron Stars ◽  
Nuclear Physics ◽  
High Density ◽  
Exclusion Principle ◽  
Nuclear Forces ◽  
Many Body ◽  
Simple Method ◽  
Preliminary Results ◽  
Future Developments ◽  
Density Matter

The conditions for superfluidity or ferromagnetism in neutron stars are presented and discussed (but not derived). It is suggested that present estimates relating to these are in error and that the predictions made contradict at least one of three sets of nuclear physics data cited in the text. This is due to neglecting the action of the exclusion principle.A comparatively simple method for calculating the strength of nuclear forces in the presence of many-body effects is outlined. Some preliminary results are presented together with projected future developments.

Electronic structure of high density carrier states in PbS, PbSe and PbTe

2004 ◽  
Vol 19 (3) ◽  
pp. 433-441 ◽  
Author(s):  
R K Das ◽  
S Sahoo ◽  
G S Tripathi
Keyword(s):  
Electronic Structure ◽  
High Density

Study of the electronic structure of an AIN surface by electron spectroscopy

1986 ◽  
Vol 178 (1-3) ◽  
pp. 201-209 ◽  
Author(s):  
M. Gautier ◽  
J.P. Duraud ◽  
C. Le Gressus
Keyword(s):  
Electronic Structure ◽  
Electron Spectroscopy
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