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Observed Enh.ncement in LIBS Signals from Nano vs. Bulk ZnO Targets: Comparative Study of Plasma Parameters

World Journal of Nano Science and Engineering 2012年第4期2卷 181-188页

作者： Ash.af M. El Sh.rbini Abdel-Nasser M. Aboulfotouh.Farid F. Rash.d sami h. allam Ash.af El Dakrouri Th.rwtt M. El Sh.rbini Collage of Applied Medical Science King Saud University KSA & the National Institute of Laser Enhanced Sciences Cairo University Giza Egypt Department of Laser and Opto-Electronic Engineering University of Technology Baghdad Iraq Department of Ph.sics Laboratory of Lasers and New Materials Faculty of Science Cairo University Giza Egypt

In th.s article, we will report an experimental evidence of enh.nced LIBS emission upon replacing a Bulk-Based ZnO target by th. corresponding Nano-Based target. Th. plasma was initiated via interaction of a Nd:YAG laser at th. fundamental wavelength.with.both.targets in open air under th. same experimental conditions. Th. measurements sh.w an enh.nced emission from th. Zn I-lines at th. wavelength. of 328.26, 330.29, 334.55, 468.06, 472.2, 481.01, 636.38 nm. Th. measurements were repeated at different delay times in th. range from 1 to 5 μs at constant irradiation level and fixed gate time of 1 μs. Th. average enh.ncement over th. different Zn I-lines was found increases exponentially up to 8-fold with.delay time. Th. electron density to each.plasma was measured utilizing th. h.-line appeared in th. emitted spectra from each.plasma and was found to give similar values. Th. electron temperatures were measured via Boltzmann plot meth.d utilizing th. relative intensities of th. Zn I-lines and were found to give very close values. Moreover, th. relative population density of th. ground state of th. zinc atoms (relative concentration) was measured spectroscopically utilizing th. Boltzmann plot meth.d and was found to increase in a very similar trend to th.t of enh.ncement. Th. results of th. spectroscopic analysis conclude th.t th.se signal enh.ncements can be attributed to th. h.gh.r concentration of neutral atoms in th. Nano-Based material plasma with.respect to th. corresponding Bulk-based ZnO material.

关键词： LIBS Enh.ncement ZnO Nonmaterial h.-Line Zn I-Lines Spectroscopy

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Spectroscopic measurement of Stark broadening parameter of th. 636.2 nm Zn I-line

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Natural Science 2013年第4期5卷 501-507页

作者： Ash.af M. El Sh.rbini Abdel-Nasser Aboulfotouh.Farid Rash.d sami h. allam Ah.ed M. Al-Kaoud Ash.af El Dakrouri Th.rwat M. El Sh.rbini College of Applied Medical Sciences King Saud University Riyadh KSA Department of Laser and Opto-Electronic Engineering University of Technology Baghdad Iraq Department of Ph.sics Collage of Science AL-Imam Muhammad Ibn Saud Islamic University (AIMSIU) Al Riyadh KSA Department of Ph.sics Laboratory of Lasers and New Materials Faculty of Science Cairo University Giza Egypt

In th.s article we will present an attempt to measure th. Stark broadening parameter of th. Zn I-line at 636.23 nm utilizing th. optical emission spectroscopy (OES) tech.ique, taking into consideration th. possibility of existence of self absorption. Th.s meth.d is standing on comparison of th. Lorentzian FWh. and spectral line intensity of th. unknown Stark broadening parameter line (Zn I-636.23 nm—in our case) to a well known Stark parameter line (e.g. Zn I-lines at 472.2, 481 and 468 nm) at a reference electron density of 2.7 × 1017 cm-3 and temperature of 1 eV. We h.ve utilized th. emission spectral data acquired from well diagnosed plasma produced by th. interaction of Nd: YAG laser at wavelength.of 1064 nm with.ZnO nanomaterial target in open air. Th. results indicates th.t th. Stark broadening of th. Zn I-line at 636.23 nm is centered at 5.06 ± 0.03 ? with.a 25% uncertainty at th. given reference plasma parameters. Th. knowledge of th. Stark broadening parameter of th. 636.23 nm line may be important in th. diagnostics of th. laser plasma experiments especially in th. absence of th. h.-line.

关键词： Stark Broadening Parameter LIBS OES ZnO Zinc Lines

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