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      저자 : HamdyF. Mohamed (검색결과 1 건)
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        Experimental Study on the Element-Specific Positron Annihilation Spectroscopy

        김용민,Junhyun Kwon,HamdyF. Mohamed,MoonJoo Hyun,Changsun Kang 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.6

        Coincidence Doppler-broadening (CDB) and positron annihilation lifetime (PAL) techniques have been applied to study 12 pure elements. The existence of open-type defects was investigated in the elements. The characteristic features of the high-momentum part of the CDB spectra for elemental metals with/without defects were investigated. By normalizing the CDB spectra to the CDB spectrum of well-annealed Ti, ratio-curves are presented. The moment region range (12×10-3 moc < PL < 20 × 10-3 moc) was elucidated and provided important information on the elemental specificity. An empirical relation that linked the positron anities and the atomic number to the shape of the high-momentum part of the CDB spectra for 3-d elements was derived. The results imply that elements (closely located in the periodic table) can be identified from an analysis of the CDB spectra. Coincidence Doppler-broadening (CDB) and positron annihilation lifetime (PAL) techniques have been applied to study 12 pure elements. The existence of open-type defects was investigated in the elements. The characteristic features of the high-momentum part of the CDB spectra for elemental metals with/without defects were investigated. By normalizing the CDB spectra to the CDB spectrum of well-annealed Ti, ratio-curves are presented. The moment region range (12×10-3 moc < PL < 20 × 10-3 moc) was elucidated and provided important information on the elemental specificity. An empirical relation that linked the positron anities and the atomic number to the shape of the high-momentum part of the CDB spectra for 3-d elements was derived. The results imply that elements (closely located in the periodic table) can be identified from an analysis of the CDB spectra.

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