000			03243cam a2200349 a 4500
003			EG-GiCUC
005			20250223032301.0
008			190515s2018 ua dh f m 000 0 eng d
040			_aEG-GiCUC _beng _cEG-GiCUC
041	0		_aeng
049			_aDeposite
097			_aM.Sc
099			_aCai01.12.20.M.Sc.2018.Da.S
100	0		_aDalia Abdrabou Saad Abdrabou
245	1	2	_aA spectroscopic study of the plasma produced by laser interaction with molybdenum and molybdenum alloys / _cDalia Abdrabou Saad Abdrabou ; Supervised Th. M. Elsherbini , Mohamed Atta Kheder , Ali Hussein
246	1	5	_aالدراسات الطيفية للبلازما الناتجة من تفاعل الليزرمع الموليبدنيوم وسبائك الموليبدنيوم
260			_aCairo : _bDalia Abdrabou Saad Abdrabou , _c2018
300			_a86 P. : _bcharts , facsimiles ; _c25cm
502			_aThesis (M.Sc.) - Cairo University - Faculty of Science - Department of Physics
520			_aThe spectral emission from plasmas of pure Mo, Mo-Ni-Cr alloys and Li-Cu alloys following irradiation by different Nd: YAG laser beams were investigated. The study was done with the laser beam at its first harmonic (1064 nm), 206 mJ, 7 ns duration pulse, repetition rate 10 Hz (Type Q- switched Nd:YAG laser at National Institute of Laser Enhanced Science, Cairo University) and the second harmonic (532 nm ), 300 mJ, 2 ns duration pulse and repetition rate 10 Hz (Type Quantal Brilliant Q-switched Nd:YAG laser at Philipps Universitat Marburg, Germany) in open air at atmospheric pressure. The radiation emitted from the target in the local thermodynamic equilibrium (LTE) was analyzed and the temperature of the plasma was calculated by the Boltzmann plot method. The electron number density (Ne) was determined from the Stark broadening of the emitted spectral line. The comparison of the electron densities at different neutral molybdenum lines (465.5, 498, 517and 550 nm) with those from hydrogen HÜ-line (656.3 nm) showed good agreement. The study included also the variation of the electron densities and electron temperatures with the delay time, the laser fluence and the distances from the target surface. The aim of the work is to check the self-absorption and to correct for the intensity of the spectral lines and hence to improve the accuracy of the electron temperature and the electron density results. It was found that the neutral molybdenum lines suffer from self-absorption and hence a correction for self-absorption was done. The corrected temperatures against self-absorption were measured at different delay times ranging from 2 to 5 os. The electron density and the electron temperature were also measured for Mo-Ni-Cr alloys and Li-Cu alloys at different laser fluencies and were compared with the results from pure Mo targets
530			_aIssued also as CD
653		4	_aMolybdenum
653		4	_aMolybdenum alloys
653		4	_aPlasma produced
700	0		_aAli Hussein , _eSupervisor
700	0		_aMohamed Atta Kheder , _eSupervisor
700	0		_aTh. M. Elsherbini , _eSupervisor
856			_uhttp://172.23.153.220/th.pdf
905			_aNazla _eRevisor
905			_aShimaa _eCataloger
942			_2ddc _cTH
999			_c71981 _d71981