Structure Analysis of Water Ice Crystallites on NaCl(001), KCl(001), and CaF2(111) by Reflection High-Energy Electron Diffraction

2020 ◽  
Vol 124 (28) ◽  
pp. 15180-15187 ◽  
Author(s):  
Ryutaro Souda ◽  
Takashi Aizawa ◽  
Naoyuki Sugiyama ◽  
Masaki Takeguchi
Keyword(s):  
Electron Diffraction ◽  
Structure Analysis ◽  
High Energy ◽  
Energy Electron ◽  
High Energy Electron ◽  
Water Ice

ELECTRON STANDING WAVES AT A SURFACE DURING REFLECTION HIGH ENERGY ELECTRON DIFFRACTION AND APPLICATION TO STRUCTURE ANALYSIS

2000 ◽  
Vol 14 (21) ◽  
pp. 2171-2222
Author(s):  
TOSHIRO YAMANAKA ◽  
SHOZO INO
Keyword(s):  
Electron Diffraction ◽  
Structure Analysis ◽  
Standing Waves ◽  
High Energy ◽  
Energy Electron ◽  
High Energy Electron ◽  
Surface Electron ◽  
X Ray ◽  
Wave Resonance ◽  
Glancing Angle

During observation of reflection high energy electron diffraction (RHEED), the interference between the incident and diffracted beams leads to the formation of surface electron standing waves. Characteristic X-ray emission is strongly excited if the atom exists in a strong wave field. Therefore, X-ray yields depends on the position of the atom and incident glancing angle (θg) of the electron beam, since the distribution of these waves changes with θg. Such anomalous intensities of X-ray emission are clearly observed under both Bragg and surface wave resonance conditions. By using these intensities, the height and adsorption site of surface adatoms can be analyzed. In this review, surface electron channeling and its application to surface structure analysis are discussed.

Reflection high energy electron diffraction (RHEED) study of ice nucleation and growth on Ni(111): influences of adspecies and electron irradiation

2019 ◽  
Vol 21 (35) ◽  
pp. 19585-19593 ◽  
Author(s):  
Ryutaro Souda ◽  
Takashi Aizawa
Keyword(s):  
Electron Diffraction ◽  
Electron Irradiation ◽  
High Energy ◽  
Nucleation And Growth ◽  
Ice Nucleation ◽  
Energy Electron ◽  
High Energy Electron ◽  
Growth Processes ◽  
Water Ice

Nucleation and growth processes of water ice on Ni(111) and how they are influenced by O and CO adspecies and electron irradiation are explored based on RHEED images.

Surface structure analysis using reflection high‐energy electron diffraction

1988 ◽  
Vol 6 (3) ◽  
pp. 611-614 ◽  
Author(s):  
K. D. Jamison ◽  
D. N. Zhou ◽  
P. I. Cohen ◽  
T. C. Zhao ◽  
S. Y. Tong
Keyword(s):  
Electron Diffraction ◽  
Surface Structure ◽  
Structure Analysis ◽  
High Energy ◽  
Energy Electron ◽  
High Energy Electron

Kinematic Approximations in TED and RHEED Analysis of Reconstructed Surfaces

1990 ◽  
Vol 48 (2) ◽  
pp. 396-397
Author(s):  
L. -M. Peng ◽  
M. J. Whelan
Keyword(s):  
Electron Diffraction ◽  
Kinematic Analysis ◽  
Incident Beam ◽  
High Energy ◽  
Energy Electron ◽  
Great Success ◽  
High Energy Electron ◽  
Kinematic Approximation ◽  
Reconstructed Surfaces

In recent years there has been a trend in the structure determination of reconstructed surfaces to use high energy electron diffraction techniques, and to employ a kinematic approximation in analyzing the intensities of surface superlattice reflections. Experimentally this is motivated by the great success of the determination of the dimer adatom stacking fault (DAS) structure of the Si(111) 7 × 7 reconstructed surface.While in the case of transmission electron diffraction (TED) the validity of the kinematic approximation has been examined by using multislice calculations for Si and certain incident beam directions, far less has been done in the reflection high energy electron diffraction (RHEED) case. In this paper we aim to provide a thorough Bloch wave analysis of the various diffraction processes involved, and to set criteria on the validity for the kinematic analysis of the intensities of the surface superlattice reflections.The validity of the kinematic analysis, being common to both the TED and RHEED case, relies primarily on two underlying observations, namely (l)the surface superlattice scattering in the selvedge is kinematically dominating, and (2)the superlattice diffracted beams are uncoupled from the fundamental diffracted beams within the bulk.

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