An optoelectronic notch (‘dip’) phenomenon in the heterodyne photocarrier radiometry frequency response of Si wafers: a route to quantitative trap-state dynamic processes in semiconductors

2020 ◽  
Vol 35 (11) ◽  
pp. 115024
Author(s):  
Yaqin Song ◽  
Andreas Mandelis ◽  
Alexander Melnikov ◽  
Qiming Sun
Keyword(s):  
Frequency Response ◽  
Dynamic Processes ◽  
Trap State ◽  
Photocarrier Radiometry ◽  
State Dynamic

scholarly journals Response of a Preexisting Cyclonic Ocean Eddy to a Typhoon

2016 ◽  
Vol 46 (8) ◽  
pp. 2403-2410 ◽  
Author(s):  
Zhumin Lu ◽  
Guihua Wang ◽  
Xiaodong Shang
Keyword(s):  
Frequency Response ◽  
Horizontal Plane ◽  
Numerical Experiments ◽  
Three Dimensional ◽  
Low Frequency ◽  
Cyclonic Eddy ◽  
Dimensional Structure ◽  
Altimeter Data ◽  
Dynamic Processes ◽  
Three Dimensional Structure

AbstractThe three-dimensional responses of a cyclonic ocean eddy (COE) for 1–2 months following a typhoon were investigated using altimeter data and numerical experiments. Two significant features were found: 1) the cyclonic eddy was enhanced, and the three-dimensional structure was changed, and 2) the cyclonic eddy underwent two processes: elliptical deformation and reaxisymmetrization in the horizontal plane. These two features are generally associated with typhoon-induced upwelling and the dynamic processes of eddy adjustment. These results imply that the local ocean processes can be affected by a typhoon through low-frequency response.

Surface reactions observed by photoemission electron microscopy (PEEM)

1992 ◽  
Vol 50 (1) ◽  
pp. 286-287
Author(s):  
H.H. Rotermund
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Work Function ◽  
Chemical Reactions ◽  
Reaction Diffusion ◽  
Dynamic Processes ◽  
Clean Surface ◽  
Crystal Surfaces ◽  
Single Crystal Surfaces ◽  
Photoemission Electron

Chemical reactions at a surface will in most cases show a measurable influence on the work function of the clean surface. This change of the work function δφ can be used to image the local distributions of the investigated reaction,.if one of the reacting partners is adsorbed at the surface in form of islands of sufficient size (Δ>0.2μm). These can than be visualized via a photoemission electron microscope (PEEM). Changes of φ as low as 2 meV give already a change in the total intensity of a PEEM picture. To achieve reasonable contrast for an image several 10 meV of δφ are needed. Dynamic processes as surface diffusion of CO or O on single crystal surfaces as well as reaction / diffusion fronts have been observed in real time and space.

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