Deconvolution of EELS Spectra Revisited

1990 ◽  
Vol 48 (2) ◽  
pp. 26-27
Author(s):  
D.S. Su ◽  
P. Schattschneider
Keyword(s):  
Thin Film ◽  
Energy Spectrum ◽  
Free Path ◽  
Phase Retrieval ◽  
Mean Free Path ◽  
Phase Correction ◽  
Low Energy ◽  
The Mean ◽  
First Time ◽  
Plasmon Spectrum

The exact analysis of EELS-data needs a removal of multiple scattering from the measured low energy spectrum. Several methods have been reported. However, only the Fourierlog deconvolution seems to be widely used, inspite of difficuties with correct phase retrieval. Alternatively, a matrix-deconvolution proposed by one of the authors can be applied. The following comparison of the distinct approaches shows for the first time the limitation of the methods. Surprisingly, we find that the Fourier-log method is restricted to D ≤ π/2 (D is given in units of the mean free path) even if the proposed phase correction is applied. But also the method given by Spence, theoretically applicable for any D, fails for D ≥ 3 in our simulation. These failures may have been overlooked because EELS experimenters avoid specimens with D ≥ π/2, in general.We obtained the single loss distribution S from a measured Al plasmon spectrum of a thin film (d = 50nm) using the Fourier-log algorithm.

THE PROBLEM OF THE MEAN FREE PATH OF BOUND NUCLEONS: IMPLICATIONS FOR THE NUCLEAR FORCE

1990 ◽  
Vol 05 (20) ◽  
pp. 1531-1541 ◽  
Author(s):  
NORMAN D. COOK
Keyword(s):  
Free Path ◽  
Nuclear Force ◽  
Mean Free Path ◽  
Low Energy ◽  
Nuclear Spectroscopy ◽  
Structure Theory ◽  
Particle Model ◽  
Independent Particle ◽  
Independent Particle Model ◽  
The Mean

The mean-free-path (MFP) of bound nucleons is one of the classic problems in nuclear structure theory. Although it has often been asserted that the MFP is “long”, theoretical estimates and empirical evidence consistently show that the MFP of low-energy nucleons is less than two nucleao diameters (2–3 fm) and far shorter than the several nuclear diameters (>30 fm) needed to establish nucleons in intra-nuclear orbits. Such results indicate that the nucleon states known from nuclear spectroscopy must be explained by a version of the independent-particle model which does not require the free orbiting of nucleons within nuclei.

Surface and Interface Analysis of Thin-Film/Si(Substrate) Contacts by Sxes

1996 ◽  
Vol 448 ◽  
Author(s):  
C. Heck ◽  
M. Kusaka ◽  
M. Hirai ◽  
H. Nakamura ◽  
M. Iwami ◽  
...  
Keyword(s):  
Thin Film ◽  
Free Path ◽  
Energetic Electron ◽  
Mean Free Path ◽  
Si Substrate ◽  
X Ray ◽  
Interface Analysis ◽  
Surface And Interface ◽  
The Mean ◽  
Primary Electrons

AbstractA soft X-ray emission spectroscopy(SXES) study under an energetic electron irradiation has been applied to a nondestructive buried interface analysis of a thin-film(e.g., Cr)/Si(substrate) contact system, where the energy of primary electrons, Ep , is less than 20keV. An interesting point of this method is that we can have a specific signal for an element to be used as a finger print, otherwise it is difficult. By using this e-beam excited SXES, we can study an interface buried deep in a rather thick overlayer, e.g., more than a hundred of nm, which is due to the fact that a mean free path of a soft X-ray or an X-ray production depth is much larger than the mean free path of an energetic electron in solids. Electronic structural study of silicides by SXES is also shown.

THE MAGNETIC ANISOTROPY OF Ni AND THE MEAN FREE PATH OF THE ELECTRONS

1971 ◽  
Vol 32 (C1) ◽  
pp. C1-539-C1-540 ◽  
Author(s):  
K. HAUSMANN ◽  
M. WOLF
Keyword(s):  
Magnetic Anisotropy ◽  
Free Path ◽  
Mean Free Path ◽  
The Mean

Low-energy electron inelastic mean free path and elastic mean free path of graphene

2021 ◽  
Vol 118 (5) ◽  
pp. 053104
Author(s):  
L. H. Yang ◽  
B. Da ◽  
H. Yoshikawa ◽  
S. Tanuma ◽  
J. Hu ◽  
...  
Keyword(s):  
Free Path ◽  
Mean Free Path ◽  
Low Energy ◽  
Energy Electron ◽  
Low Energy Electron ◽  
Inelastic Mean Free Path

scholarly journals Ballistic Heat Transport in Nanocomposite: The Role of the Shape and Interconnection of Nanoinclusions

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1982
Author(s):  
Paul Desmarchelier ◽  
Alice Carré ◽  
Konstantinos Termentzidis ◽  
Anne Tanguy
Keyword(s):  
Thermal Conductivity ◽  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Free Path ◽  
Mean Free Path ◽  
Strong Increase ◽  
Moderate Increase ◽  
Energy Propagation ◽  
The Mean ◽  
Dynamics Simulations

In this article, the effect on the vibrational and thermal properties of gradually interconnected nanoinclusions embedded in an amorphous silicon matrix is studied using molecular dynamics simulations. The nanoinclusion arrangement ranges from an aligned sphere array to an interconnected mesh of nanowires. Wave-packet simulations scanning different polarizations and frequencies reveal that the interconnection of the nanoinclusions at constant volume fraction induces a strong increase of the mean free path of high frequency phonons, but does not affect the energy diffusivity. The mean free path and energy diffusivity are then used to estimate the thermal conductivity, showing an enhancement of the effective thermal conductivity due to the existence of crystalline structural interconnections. This enhancement is dominated by the ballistic transport of phonons. Equilibrium molecular dynamics simulations confirm the tendency, although less markedly. This leads to the observation that coherent energy propagation with a moderate increase of the thermal conductivity is possible. These findings could be useful for energy harvesting applications, thermal management or for mechanical information processing.

Experiments on the flow of heat in liquid helium below 0.7 °K

1958 ◽  
Vol 246 (1246) ◽  
pp. 390-405 ◽  
Keyword(s):  
Thermal Conductivity ◽  
Liquid Helium ◽  
Free Path ◽  
Empirical Relation ◽  
Mean Free Path ◽  
Series Of Experiments ◽  
The Mean ◽  
Set Up ◽  
Low Pressures ◽  
Measured Thermal Conductivity

A series of experiments has been performed to study the steady flow of heat in liquid helium in tubes of diameter 0.05 to 1.0 cm at temperatures between 0.25 and 0.7 °K. The results are interpreted in terms of the flow of a gas of phonons, in which the mean free path λ varies with temperature, and may be either greater or less than the diameter of the tube d . When λ ≫ d the flow is limited by the scattering of the phonons at the walls, and the effect of the surface has been studied, but when λ ≪ d viscous flow is set up in which the measured thermal conductivity is increased above that for wall scattering. This behaviour is very similar to that observed in the flow of gases at low pressures, and by applying kinetic theory to the problem it can be shown that the mean free path of the phonons characterizing viscosity can be expressed by the empirical relation λ = 3.8 x 10 -3 T -4.3 cm. This result is inconsistent with the temperature dependence of λ as T -9 predicted theoretically by Landau & Khalatnikov (1949).

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