Effect of surface defects on charge exchange of low-energy deuterium ions scattered fromSrCl2andBaF2

1998 ◽  
Vol 58 (7) ◽  
pp. 4143-4148 ◽  
Author(s):  
R. Souda ◽  
T. Suzuki ◽  
H. Kawanowa ◽  
E. Asari
Keyword(s):  
Charge Exchange ◽  
Surface Defects ◽  
Low Energy ◽  
Effect Of Surface

scholarly journals Colloidal CdSe nanocrystals are inherently defective

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Tamar Goldzak ◽  
Alexandra R. McIsaac ◽  
Troy Van Voorhis
Keyword(s):  
Charge Transfer ◽  
Energy Spectrum ◽  
Surface Structure ◽  
Short Range ◽  
Surface Defects ◽  
Low Energy ◽  
Lewis Base ◽  
Cdse Nanocrystals ◽  
Photoinduced Charge Transfer ◽  
Photoinduced Charge

AbstractColloidal CdSe nanocrystals (NCs) have shown promise in applications ranging from LED displays to medical imaging. Their unique photophysics depend sensitively on the presence or absence of surface defects. Using simulations, we show that CdSe NCs are inherently defective; even for stoichiometric NCs with perfect ligand passivation and no vacancies or defects, we still observe that the low energy spectrum is dominated by dark, surface-associated excitations, which are more numerous in larger NCs. Surface structure analysis shows that the majority of these states involve holes that are localized on two-coordinate Se atoms. As chalcogenide atoms are not passivated by any Lewis base ligand, varying the ligand should not dramatically change the number of dark states, which we confirm by simulating three passivation schemes. Our results have significant implications for understanding CdSe NC photophysics, and suggest that photochemistry and short-range photoinduced charge transfer should be much more facile than previously anticipated.

Investigation of surface defects on Ni(110) with a low-energy positron beam

1987 ◽  
Vol 35 (3) ◽  
pp. 1034-1038 ◽  
Author(s):  
A. R. Köymen ◽  
D. W. Gidley ◽  
T. W. Capehart
Keyword(s):  
Surface Defects ◽  
Positron Beam ◽  
Low Energy

Effect of surface defects on the fatigue behavior of a cast TiAl alloy.

2000 ◽  
Vol 646 ◽  
Author(s):  
M. Nazmy ◽  
M. Staubli ◽  
G. Onofrio ◽  
V. Lupinc
Keyword(s):  
Tial Alloy ◽  
High Cycle Fatigue ◽  
Surface Defects ◽  
Fatigue Behavior ◽  
Impact Resistance ◽  
Economic Life ◽  
Crack Advance ◽  
Crack Growth Behavior ◽  
Engine Components ◽  
Effect Of Surface

ABSTRACTThe effect of surface defects on the performance of TiAl-base alloys is an issue of importance in contemplating their application into engine components. Due to the relatively low ductility and low impact resistance of gamma alloys the validation of models for estimating economic life and for safe-life approaches employed for components becomes of great importance. Surface defects can be attributed to various sources during the manufacturing or handling of the components. In fact, little is known about the detrimental effects of surface defects on gamma alloys. In the present study, the effect of artificially introduced surface defects, on the high cycle fatigue behavior of the Ti-47Al-2W-0.5Si, will be investigated and correlated with the crack growth behavior at 700°C. The results are reported in the form of the Kitagawa diagram in which the safe and unsafe zones for crack advance and fracture are defined.

Low Energy Electron Microscopy of Surface Processes on Clean Si(111) and Si (100)

1989 ◽  
Vol 159 ◽  
Author(s):  
E. Bauer ◽  
M. Mundschau ◽  
W. Swiech ◽  
W. Telieps
Keyword(s):  
Electron Microscopy ◽  
Phase Transitions ◽  
Crystal Growth ◽  
Surface Defects ◽  
Low Energy ◽  
Energy Electron ◽  
Surface Processes ◽  
Surface Phase ◽  
Surface Phase Transitions ◽  
Low Energy Electron

ABSTRACTLow energy electron microscopy (LEEM) is briefly introduced and its application to the study of surface defects, surface phase transitions on Si(111), crystal growth and sublimation on Si(100) is illustrated.

Effect of surface defects in Pd-based membranes on the performance of a membrane reactor

2010 ◽  
Vol 5 (1) ◽  
pp. 213-225 ◽  
Author(s):  
Alessio Caravella ◽  
Francesco Paolo Di Maio ◽  
Alberto Di Renzo
Keyword(s):  
Membrane Reactor ◽  
Surface Defects ◽  
Effect Of Surface
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