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.

scholarly journals Calculate the Attenuation of X-ray radiation for low density polyethylene composites with oyster shells powder extracted from the Caspian Sea in Iran: حساب الحجب الإشعاعي للأشعة السينية لبوليمر البولي اثيلين واطئ الكثافة والمطعم بمسحوق قشور المحار المستخرج من بحر قزوين

2019 ◽  
Vol 3 (1) ◽  
Author(s):  
Ahmed Jassim Mohammed, Riad Manadi Ramadan, Raed Muslim Shab
Keyword(s):  
Free Path ◽  
Attenuation Coefficient ◽  
Caspian Sea ◽  
Mean Free Path ◽  
Low Density Polyethylene ◽  
Linear Attenuation Coefficient ◽  
Low Density ◽  
The Caspian Sea ◽  
X Ray ◽  
The Mean

In this research, Calculation the Attenuation of X-ray radiation for low density polyethylene composites with oyster shells powder (extracted from the Caspian Sea in Iran), low density polyethylene production in the form of powder by the State Company for Petrochemical Industries (Basra-Iraq), the range of the added of oyster shells powder (extracted from the Caspian sea in Iran) has the values (0%, 2.5%, 5%, 10%, 15%, 20%, and 25%) for low density polyethylene weight and the added oyster shells powder with the particular size (≤ 250 μm). were investigated through several variables, such as, linear attenuation coefficient(μ) and mean free path(λ). The obtained results were appeared that the added oyster to reduce the spaces between the polymer chains, which reflects the high ability of the polymer as (10%-20%), and this increase will give further property that increase the attenuation x-ray of the prepared specimens. Where the practical study and the beam of intensity of energy (30 kv) and)VG.M = 600 voit(. The results showed that when increasing filler content, the total linear attenuation coefficient increases while the mean free path decreases. The mean free path (λ) at (2.5%) is (2.1 cm (, while at (20%) is (0.40 cm). The value of the linear attenuation coefficient (μ) at (20%) is)2.44 cm-1(, while at (2.5%) is) 0.49 cm-1(.

The electronic structure of liquid metals

1962 ◽  
Vol 267 (1331) ◽  
pp. 518-540 ◽  
Keyword(s):  
Electronic Structure ◽  
Electronic Properties ◽  
Free Path ◽  
Free Electron ◽  
Knight Shift ◽  
Liquid Metals ◽  
Mean Free Path ◽  
X Ray ◽  
Structure Of Liquids ◽  
The Mean

An analysis is given of the electronic structure of liquids under conditions for which the almost free-electron approximation is applicable. An enumeration of the various conditions that can exist is given, based on the relative magnitudes of the mean free path and range of order in the liquid. An important case is that in which the electronic properties can be described in terms of the X -ray data and this is discussed in detail, the curves of energy against momentum being given with calculations of the resistance and Knight shift. When considerable order is present the analysis is more complicated and the behaviour of the energy momentum curves is given as the range of order varies from the extreme cases of no order to polycrystalline order.

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.

scholarly journals Study the effect of addition Rockwool fibers on the Shielding Radiation  for the X-ray of Low Density Polyethylene (LDPE): دراسة تأثير إضافة ألياف الصوف الصخري على الحجب الإشعاعي للأشعة السينية للبولي اثيلين واطىئ الكثافة

2020 ◽  
Vol 4 (2) ◽  
Author(s):  
Shaymaa H. Jasim, Wisam A. Radhi, Riyadh M. Ramadhan, Raed M
Keyword(s):  
Free Path ◽  
Attenuation Coefficient ◽  
Mean Free Path ◽  
Weight Percent ◽  
Linear Attenuation Coefficient ◽  
X Rays ◽  
X Ray ◽  
Minimum Value ◽  
Maximum Value ◽  
The Mean

The extinction of X-rays (radiation attenuation) was studied using the low-density samples of polyethylene polymer to which the rockwool fibers powder is added as filled filler. This latter was blended with (weight percent) and with a micro-filler (filler particle) the sizes equal to or less than<212 μm. Furthermore, the free path average and linear attenuation coefficient were calculated.  Experimental results showed that the rockwool fibers powder act to reduce the spaces between polymer chains particularly when the weight percent is more than (10%), which implies the capability of the polymer/filler to make, the X-rays applied to the samples; disappear at these rates used in this study. The experimental work was conducted by applying a radiation beam having an energy of 30 kV based on the use of the X-ray unit with two tubes which are; X-ray generating tube and G-M detector with an energy of VG.M =600. The magnitudes of the mean free path are inversely proportional to the weight percent of the compound material whereas the proportionality of these percentages which are particularly the high ones which occur at experimental values of the linear attenuation coefficient. The value of the mean free path of 1.28 cm is the maximum value obtained at a weight percent of 1 %, whereas the minimum value of the mean path was 0.877 cm at a weight percent of 10 %. In addition, the maximum value of the attenuation coefficient obtained is 4.754 cm-1 at a weight percent of 10% and its minimum value at a weight percent of 1% was 0.7 cm-1. The maximum value of transmittance and the minimum value of absorbance were obtained at a weight percent of 10%, are (31.8) and (68.2) respectively. Through the practical results that we obtained that are better suited to high percentages more additive proportions can be used than the percentages used in this research to shielding X-rays more.

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.

Study of the quality of GaAs thin film on Si substrate by X-ray diffraction method

1990 ◽  
Vol 7 (7) ◽  
pp. 308-311
Author(s):  
Li Chaorong ◽  
Mai Zhenhong ◽  
Cui Shufan ◽  
Zhou Junming ◽  
Yutian Wang
Keyword(s):  
Thin Film ◽  
Diffraction Method ◽  
X Ray Diffraction ◽  
Si Substrate ◽  
X Ray
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