Single-Phase Diffusion Model

2021 ◽  
pp. 105-119
Author(s):  
Mohammad U.H. Joardder ◽  
Washim Akram ◽  
Azharul Karim
Keyword(s):  
Diffusion Model ◽  
Single Phase ◽  
Phase Diffusion

Numerical Studies of Atomic Three-Step Photoionization Processes with Non-Monochromatic Laser Fields

2022 ◽  
Author(s):  
Xiaoyong Lu ◽  
Lide Wang ◽  
Yunfei Li
Keyword(s):  
Diffusion Model ◽  
Isotope Separation ◽  
Laser Fields ◽  
Phase Diffusion ◽  
Evaluation Indexes ◽  
Design And Optimization ◽  
Photoionization Process ◽  
Numerical Studies ◽  
Chaotic Field ◽  
Laser Isotope Separation

Abstract The atomic selective multi-step photoionization process is a critical step in laser isotope separation. In this article, we have studied three-step photoionization processes with non-monochromatic laser fields theoretically based on the semi-classical theory. Firstly, three bandwidth models, including the chaotic field model, de-correlation model and phase diffusion model, are introduced into the density matrix equations. The numerical results are made comparisons comprehensively. The phase diffusion model is selected for further simulations in terms of the correspondence degree to physical practice. Subsequently, numerical calculations are carried out to identify the influences of systematic parameters, including laser parameters (Rabi frequencies, bandwidths, relative time delays, frequency detunings) and atomic Doppler broadening, on photoionization processes. In order to determine the optimum match between different systematic parameters, ionization yield of resonant isotope and selectivity factor are adopted as evaluation indexes to guide the design and optimization process. The results in this work can provide a rewarding reference for laser isotope separation.

Single-phase diffusion study in β-Zr(Al)

2002 ◽  
Vol 305 (2-3) ◽  
pp. 124-133 ◽  
Author(s):  
A Laik ◽  
K Bhanumurthy ◽  
G.B Kale
Keyword(s):  
Single Phase ◽  
Diffusion Study ◽  
Phase Diffusion

Diffusion calculations for the 80-K-to-110-K Bi(Pb)SrCaCuO superconducting phase transformation

1999 ◽  
Vol 14 (11) ◽  
pp. 4143-4147 ◽  
Author(s):  
Wen Zhu ◽  
Chu Kun Kuo ◽  
Patrick S. Nicholson
Keyword(s):  
Phase Transformation ◽  
Diffusion Model ◽  
Chemical Transformation ◽  
Diffusion Coefficients ◽  
Activation Energies ◽  
Superconducting Phase ◽  
Cation Diffusion ◽  
High Activation ◽  
Phase Diffusion ◽  
Diffusion Rates

A diffusion model is proposed to fit the measured chemical-transformation rates of the Bi(Pb)CaCuSrO 80-K phase to 110-K phase. Diffusion coefficients and activation energies in PO2 = 0.08 and 0.21 atm are reported. The low diffusion rates and high activation energies suggest cation diffusion controls the transformation.

GaN Selective Area Metal–Organic Vapor Phase Epitaxy: Prediction of Growth Rate Enhancement by Vapor Phase Diffusion Model

2007 ◽  
Vol 46 (No. 43) ◽  
pp. L1045-L1047 ◽  
Author(s):  
Tomonari Shioda ◽  
Yuki Tomita ◽  
Masakazu Sugiyama ◽  
Yukihiro Shimogaki ◽  
Yoshiaki Nakano
Keyword(s):  
Growth Rate ◽  
Diffusion Model ◽  
Vapor Phase ◽  
Vapor Phase Epitaxy ◽  
Rate Enhancement ◽  
Phase Diffusion ◽  
Organic Vapor ◽  
Selective Area ◽  
Metal Organic
Sign in / Sign up

Export Citation Format

Share Document