Analysis of initial stage of Pd‐Si (111) and Au‐Si (111) interface reactions by means of high‐resolution proton energy‐loss spectroscopy

1987 ◽  
Vol 51 (14) ◽  
pp. 1072-1074 ◽  
Author(s):  
Jun‐ichi Kanasaki ◽  
Noriaki Itoh ◽  
Noriaki Matsunami
Keyword(s):  
High Resolution ◽  
Energy Loss ◽  
Proton Energy ◽  
Interface Reactions ◽  
Initial Stage

High resolution proton energy loss spectroscopy of the high overtone vibrations in CF4

1995 ◽  
Vol 103 (4) ◽  
pp. 1333-1352 ◽  
Author(s):  
W. Maring ◽  
J. P. Toennies ◽  
R. G. Wang ◽  
H. B. Levene
Keyword(s):  
High Resolution ◽  
Energy Loss ◽  
Proton Energy ◽  
High Overtone

scholarly journals High Resolution Proton Energy Loss Spectroscopy of High Overtone Levels of Polyatomic Molecules

1991 ◽  
Vol 11 (3-4) ◽  
pp. 247-252 ◽  
Author(s):  
W. Maring ◽  
J. P. Toennies
Keyword(s):  
High Resolution ◽  
Energy Loss ◽  
Inelastic Scattering ◽  
Proton Energy ◽  
Polyatomic Molecules ◽  
High Degree ◽  
Collision Mechanism ◽  
Very High ◽  
High Overtone ◽  
Anharmonicity Constants

In the inelastic scattering of nearly monoenergetic proton beams (≅ 20 e V) from polyatomic molecules such as CF4 sharp peaks are observed corresponding to the excitation of very high overtone levels (n ≤ 14) of the infrared active modes. The collision mechanism leading to the high degree of excitation is described and an example from recent experiments is presented. A fit of the CF4 spectra provides new anharmonicity constants for the ν3-mode.

High-resolution proton energy-loss spectroscopy of the high-overtone levels of the v3 mode in CF4

1991 ◽  
Vol 184 (4) ◽  
pp. 262-266 ◽  
Author(s):  
W. Maring ◽  
J.P. Toennies ◽  
R.G. Wang ◽  
H.B. Levene
Keyword(s):  
High Resolution ◽  
Energy Loss ◽  
Proton Energy ◽  
High Overtone

Low-workfunction field-emission source for high-resolution EELS

1987 ◽  
Vol 45 ◽  
pp. 132-133
Author(s):  
P. E. Batson
Keyword(s):  
High Resolution ◽  
Energy Loss ◽  
Electron Probe ◽  
Collection Efficiency ◽  
Electron Sources ◽  
Wien Filter ◽  
Half Angle ◽  
Thermal Emitter ◽  
Electron Energy Loss ◽  
Intrinsic Energy

In recent years,instrumentation for electron energy loss spectroscopy (EELS) has been steadily improved to increase energy resolution and collection efficiency. At present 0.40eV at 10mR collection half angle is available with commercial magnetic sectors (e.g. Gatan, Inc. and VG Microscopes, Ltd.), and 70meV at 10mR has been demonstrated by use of a Wien filter within a large deceleration field. When these high resolution spectrometers are coupled to the modern small electron probe instrument, we obtain a tool which promises to reveal local changes in bandstructure and bonding near defects and interfaces in heterogeneous materials.Unfortunately, typical electron sources have intrinsic energy widths which limit attainable spectroscopic resolution in the absence of some monochromation system. For instance, the W thermal emitter has a half width of about 1eV.

Atomic resolution characterisation of interface structures by Electron Energy Loss Spectroscopy

1993 ◽  
Vol 51 ◽  
pp. 576-577
Author(s):  
N. D. Browning ◽  
M. M. McGibbon ◽  
M. F. Chisholm ◽  
S. J. Pennycook
Keyword(s):  
High Resolution ◽  
Energy Loss ◽  
Electron Energy ◽  
Electron Energy Loss Spectroscopy ◽  
Imaging Technique ◽  
Atomic Scale ◽  
Atomic Resolution ◽  
Reference Image ◽  
The Impact ◽  
Electron Energy Loss

The recent development of the Z-contrast imaging technique for the VG HB501 UX dedicated STEM, has added a high-resolution imaging facility to a microscope used mainly for microanalysis. This imaging technique not only provides a high-resolution reference image, but as it can be performed simultaneously with electron energy loss spectroscopy (EELS), can be used to position the electron probe at the atomic scale. The spatial resolution of both the image and the energy loss spectrum can be identical, and in principle limited only by the 2.2 Å probe size of the microscope. There now exists, therefore, the possibility to perform chemical analysis of materials on the scale of single atomic columns or planes.In order to achieve atomic resolution energy loss spectroscopy, the range over which a fast electron can cause a particular excitation event, must be less than the interatomic spacing. This range is described classically by the impact parameter, b, which ranges from ~10 Å for the low loss region of the spectrum to <1Å for the core losses.

Some problems and solutions in electron energy loss spectroscopy of cryosections

1993 ◽  
Vol 51 ◽  
pp. 566-567
Author(s):  
Zhifeng Shao ◽  
Ruoya Ho ◽  
Andrew P. Somlyo
Keyword(s):  
High Resolution ◽  
Energy Loss ◽  
Electron Energy ◽  
Electron Energy Loss Spectroscopy ◽  
Biological Research ◽  
Specimen Thickness ◽  
Elemental Distribution ◽  
Electron Dose ◽  
Simple Assumption ◽  
Electron Energy Loss

Electron energy loss spectroscopy (EELS) has been a powerful tool for high resolution studies of elemental distribution, as well as electronic structure, in thin samples. Its foundation for biological research has been laid out nearly two decades ago, and in the subsequent years it has been subjected to rigorous, but by no means extensive research. In particular, some problems unique to EELS of biological samples, have not been fully resolved. In this article we present a brief summary of recent methodological developments, related to biological applications of EELS, in our laboratory. The main purpose of this work was to maximize the signal to noise ratio (S/N) for trace elemental analysis at a minimum dose, in order to reduce the electron dose and/or time required for the acquisition of high resolution elemental maps of radiation sensitive biological materials.Based on the simple assumption of Poisson distribution of independently scattered electrons, it had been generally assumed that the optimum specimen thickness, at which the S/N is a maximum, must be the total inelastic mean free path of the beam electron in the sample.

Proton energy loss spectroscopy for surface layer analysis in the monolayer regime

1986 ◽  
Vol 15 (1-6) ◽  
pp. 142-145 ◽  
Author(s):  
Tomoki Oku ◽  
Jun-ichi Kanasaki ◽  
Noriaki Matsunami ◽  
Noriaki Itoh ◽  
Kozi Matsuda ◽  
...  
Keyword(s):  
Surface Layer ◽  
Energy Loss ◽  
Proton Energy ◽  
Layer Analysis
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