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Document Details
Document Type
:
Article In Journal
Document Title
:
Study of threshold intensity dependence on the physical processes in the breakdown of N-2 by CO2 laser radiation
Study of threshold intensity dependence on the physical processes in the breakdown of N-2 by CO2 laser radiation
Subject
:
physics
Document Language
:
English
Abstract
:
A modified numerical electron cascade model of Gamal and Abdel Moneim (1987 J. Phys. D: Appl. Phys. 20 757), previously developed by Evans and Gamal (1980 J. Phys. D: Appl. Phys. 3 1447), is used to calculate the breakdown threshold irradiance as a function of gas pressure when irradiating molecular nitrogen with a CO2 laser source under two different experimental conditions, namely, the presence and the absence of initial electron density in the focal volume before laser ignition (Camacho J J et al 2007 J. Phys. B: At. Mol. Opt. Phys. 40 4573). The model solves numerically the timedependent Boltzmann equation for the electron energy distribution function (EEDF) and a set of rate equations that describe the rate of change of the population of excited states. The model is incorporated into a computer program to obtain the threshold irradiance, which is then compared with the measured ones given by Camacho et al. The comparison showed a reasonable agreement for the two experimental conditions. In addition, the study of the EEDF and its parameters revealed different influences on the physical processes in determining the threshold irradiance for nitrogen breakdown in the two selected gas pressure regimes.
ISSN
:
0031-8949
Journal Name
:
PHYSICA SCRIPTA
Volume
:
61
Issue Number
:
1
Publishing Year
:
1435 AH
2014 AD
Article Type
:
Article
Added Date
:
Tuesday, August 1, 2017
Researchers
Researcher Name (Arabic)
Researcher Name (English)
Researcher Type
Dr Grade
Email
Yosr E. E-D Gamal
Gamal, Yosr E. E-D
Investigator
Doctorate
gamaly@yahoo.com
Laila H Jaabour,
Jaabour,, Laila H.
Researcher
Doctorate
Kholoud A Hamam
Hamam, Kholoud A
Researcher
Doctorate
Files
File Name
Type
Description
42401.pdf
pdf
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