Measurement of the variation of crystal lattice structures of ethylene copolymers with high-resolution cryogenic FTIR spectroscopy

2011 ◽  
Vol 121 (4) ◽  
pp. 2072-2077
Author(s):  
Zhiqiang Su ◽  
Qing Li ◽  
Li Cao ◽  
Xiaonong Chen
Keyword(s):  
High Resolution ◽  
Crystal Lattice ◽  
Ftir Spectroscopy ◽  
Lattice Structures ◽  
Ethylene Copolymers

Backscattered Electron Imaging of GaAs/AlGaAs Super Lattice Structures with an Ultra-High- Resolution SEM

1988 ◽  
Vol 46 ◽  
pp. 204-205
Author(s):  
Kazumichi Ogura ◽  
Michael M. Kersker
Keyword(s):  
High Resolution ◽  
Layer Structure ◽  
High Sensitivity ◽  
Beam Current ◽  
Electron Beam Current ◽  
Lattice Structures ◽  
Super Lattice ◽  
Different Types ◽  
Backscattered Electron ◽  
Electron Imaging

Backscattered electron (BE) images of GaAs/AlGaAs super lattice structures were observed with an ultra high resolution (UHR) SEM JSM-890 with an ultra high sensitivity BE detector. Three different types of super lattice structures of GaAs/AlGaAs were examined. Each GaAs/AlGaAs wafer was cleaved by a razor after it was heated for approximately 1 minute and its crosssectional plane was observed.First, a multi-layer structure of GaAs (100nm)/AlGaAs (lOOnm) where A1 content was successively changed from 0.4 to 0.03 was observed. Figures 1 (a) and (b) are BE images taken at an accelerating voltage of 15kV with an electron beam current of 20pA. Figure 1 (c) is a sketch of this multi-layer structure corresponding to the BE images. The various layers are clearly observed. The differences in A1 content between A1 0.35 Ga 0.65 As, A1 0.4 Ga 0.6 As, and A1 0.31 Ga 0.69 As were clearly observed in the contrast of the BE image.

High resolution FTIR spectroscopy using a slit jet: sampling the overtone spectrum of 12C2H4

1997 ◽  
Vol 90 (3) ◽  
pp. 381-387 ◽  
Author(s):  
R. GEORGES ◽  
M. BACH ◽  
M. HERMAN
Keyword(s):  
High Resolution ◽  
Ftir Spectroscopy

Observation of multiple Bragg reflections accompanying forbidden Si(002) reflection in bent-perfect Si crystal

2021 ◽  
pp. 1-6
Author(s):  
P. Mikula ◽  
M. Vrána ◽  
J. Šaroun ◽  
V. Ryukhtin
Keyword(s):  
High Resolution ◽  
Crystal Lattice ◽  
Perfect Crystal ◽  
Monochromatic Beam ◽  
Very High

Strong multiple Bragg reflections (MBRs) which can be realized in a bent-perfect-crystal (BPC) slab provide a monochromatic beam of excellent resolution parameters. For identifying MBR effects in the BPC Si crystal, we used the method of azimuthal rotation of the crystal lattice around the scattering vector of the primary forbidden Si(200) reflection for a fixed chosen wavelength. In this paper, several azimuthal scans searching strong MBR effects with the intention of a possible practical exploitation for very high-resolution diffractometry are presented.

scholarly journals Generation of high-resolution kagome lattice structures using extreme ultraviolet interference lithography

2012 ◽  
Vol 101 (9) ◽  
pp. 093104 ◽  
Author(s):  
Li Wang ◽  
Bernd Terhalle ◽  
Vitaliy A. Guzenko ◽  
Alan Farhan ◽  
Mohamad Hojeij ◽  
...  
Keyword(s):  
High Resolution ◽  
Extreme Ultraviolet ◽  
Interference Lithography ◽  
Lattice Structures ◽  
Kagome Lattice ◽  
Kagomé Lattice

Structure of poorly-ordered aluminosilicates

Clay Minerals ◽  
1986 ◽  
Vol 21 (5) ◽  
pp. 879-897 ◽  
Author(s):  
M. A. Wilson ◽  
S. A. McCarthy ◽  
P. M. Fredericks
Keyword(s):  
Electron Microscopy ◽  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Solid State ◽  
Nmr Spectroscopy ◽  
Magnetic Resonance ◽  
High Resolution ◽  
Ftir Spectroscopy ◽  
Driving Forces ◽  
Repulsive Forces

AbstractThe structure of synthetic aluminosilicates prepared at pH 6 has been investigated by 29Si and 27Al high-resolution solid-state nuclear magnetic resonance (NMR) spectroscopy. Fourier transform infrared (FTIR) spectroscopy and electron microscopy have also been used to characterize the products. The amount of Si and Al in protoimogolite, disordered allophane and other structures has been measured. There is a fair correlation between the intensity of the 349 cm−1 band in the FTIR spectra and the proportion by weight of protoimogolite Si measured by NMR. It is shown that disordered allophanes have similar structures to those proposed by van Reeuwijk and de Villiers (Soil Sci. Soc. Am. Proc. 32 (1968) 238–240), i.e. octahedral Al surrounding a tetrahedral core. Moreover, it is clear that at high Al:Si ratios (⩾1:1), protoimogolite can compete with disordered allophane precursors for aluminum. The driving forces for formation of protoimogolite rather than allophane appear to be long range Al-Al repulsive forces through oxygen.

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