Energy losses by slow ions and atoms to electronic excitation in solids

1977 ◽  
Vol 16 (1) ◽  
pp. 115-123 ◽  
Author(s):  
T. L. Ferrell ◽  
R. H. Ritchie
Keyword(s):  
Electronic Excitation ◽  
Energy Losses ◽  
Slow Ions

Electronic excitation spectra and energy losses of slow ions in solids

1989 ◽  
Vol 39 (4) ◽  
pp. 1999-2003 ◽  
Author(s):  
Giovanni Falcone ◽  
Zdenek Sroubek
Keyword(s):  
Electronic Excitation ◽  
Energy Losses ◽  
Excitation Spectra ◽  
Slow Ions

Energy losses of slow ions in organic medium for elastic nuclear collisions

1977 ◽  
Vol 42 (4) ◽  
pp. 373-375
Author(s):  
S. P. Kapchigashev ◽  
V. V. Duba
Keyword(s):  
Organic Medium ◽  
Energy Losses ◽  
Nuclear Collisions ◽  
Slow Ions

Monte-Carlo Study of Energy Losses in Hot Stage of Electronic Excitation Relaxation in Scintillators

1994 ◽  
Vol 348 ◽  
Author(s):  
Roman A. Glukhov ◽  
Andrey N. Vasil'ev
Keyword(s):  
Monte Carlo ◽  
Electronic Excitation ◽  
Particle Distribution ◽  
Monte Carlo Study ◽  
Energy Relaxation ◽  
Luminescence Decay ◽  
Distribution Functions ◽  
Photon Absorption ◽  
Energy Losses ◽  
Main Attention

ABSTRACTThe results of computer simulation of the fast stages of energy relaxation in insulators after the VUV or XUV photon absorption are presented. The simulation involves two stages:the inelastic scattering of excitations with production of secondary excitations and thermalization through phonon emission. The main attention is focused on the spatial distribution functions of excitations, i.e. one-particle and two-particle distribution functions.The latter Function determines the energy transfer at final stages of energy relaxation and is important for different quenching processes and the acceleration of the luminescence decay. The Monte-Carlo simulation was carried out for BaF2 crystal for photon energies from 20 eV to 100 eV. The simulation shows that the two-particle distribution functions and thus the kinetics depend on the energy of excitation.

New Aspects in the Design of Electron Optical Magnification Systems

1972 ◽  
Vol 30 ◽  
pp. 606-607
Author(s):  
Willem H.J. Andersen
Keyword(s):  
Electron Microscope ◽  
Imaging System ◽  
Chromatic Aberration ◽  
Research Tool ◽  
Energy Losses ◽  
Objective Lens ◽  
Theoretical Limit ◽  
Optical Magnification ◽  
Chromatic Aberrations ◽  
High Degree

Electron microscope design, and particularly the design of the imaging system, has reached a high degree of perfection. Present objective lenses perform up to their theoretical limit, while the whole imaging system, consisting of three or four lenses, provides very wide ranges of magnification and diffraction camera length with virtually no distortion of the image. Evolution of the electron microscope in to a routine research tool in which objects of steadily increasing thickness are investigated, has made it necessary for the designer to pay special attention to the chromatic aberrations of the magnification system (as distinct from the chromatic aberration of the objective lens). These chromatic aberrations cause edge un-sharpness of the image due to electrons which have suffered energy losses in the object.There exist two kinds of chromatic aberration of the magnification system; the chromatic change of magnification, characterized by the coefficient Cm, and the chromatic change of rotation given by Cp.

Localization of DNA in chromatin using ESI and osmium ammine staining

1990 ◽  
Vol 48 (3) ◽  
pp. 116-117
Author(s):  
C.L. Woodcock ◽  
R.A. Horowitz ◽  
D. P. Bazett-Jones ◽  
A.L. Olins
Keyword(s):  
Spectroscopic Imaging ◽  
Energy Losses ◽  
Electron Spectroscopic Imaging ◽  
Feulgen Reaction ◽  
Specific Location ◽  
Eukaryotic Nucleus ◽  
Chromatin Fibers ◽  
Patiria Miniata ◽  
Model Structures

In the eukaryotic nucleus, DNA is packaged into nucleosomes, and the nucleosome chain folded into ‘30nm’ chromatin fibers. A number of different model structures, each with a specific location of nucleosomal and linker DNA have been proposed for the arrangment of nucleosomes within the fiber. We are exploring two strategies for testing the models by localizing DNA within chromatin: electron spectroscopic imaging (ESI) of phosphorus atoms, and osmium ammine (OSAM) staining, a method based on the DNA-specific Feulgen reaction.Sperm were obtained from Patiria miniata (starfish), fixed in 2% GA in 150mM NaCl, 15mM HEPES pH 8.0, and embedded In Lowiciyl K11M at -55C. For OSAM staining, sections 100nm to 150nm thick were treated as described, and stereo pairs recorded at 40,000x and 100KV using a Philips CM10 TEM. (The new osmium ammine-B stain is available from Polysciences Inc). Uranyl-lead (U-Pb) staining was as described. ESI was carried out on unstained, very thin (<30 nm) beveled sections at 80KV using a Zeiss EM902. Images were recorded at 20,000x and 30,000x with median energy losses of 110eV, 120eV and 160eV, and a window of 20eV.

Effects of energy supplementation on energy losses and nitrogen balance of steers fed green-chopped wheat pasture I: Calorimetry

2017 ◽  
Vol 95 (5) ◽  
pp. 2133
Author(s):  
A. L. Shreck ◽  
P. J. Ebert ◽  
E. A. Bailey ◽  
J. S. Jennings ◽  
K. D. Casey ◽  
...  
Keyword(s):  
Nitrogen Balance ◽  
Energy Losses ◽  
Wheat Pasture ◽  
Energy Supplementation
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