Document Details
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Document Type |
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Article In Journal |
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Document Title |
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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 |
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Subject |
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physics |
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Document Language |
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English |
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Abstract |
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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. |
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ISSN |
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0031-8949 |
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Journal Name |
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PHYSICA SCRIPTA |
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Volume |
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61 |
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Issue Number |
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1 |
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Publishing Year |
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1435 AH
2014 AD |
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Article Type |
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Article |
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Added Date |
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Tuesday, August 1, 2017 |
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Researchers
| 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 | |
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