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Zener Sukra Lie,Ali Khumaeni,Hideaki Niki,Kazuyoshi Kurihara,Koo Hendrik Kurniawan,Rinda Hedwig,Ken-ichi Fukumoto,Kiichiro Kagawa,이용인 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.1
Our previous work on an innovative method of hydrogen (H) analysis using the specific characteristics of a TEA CO<sub>2</sub> laser, 뱒elective detection method of H? has been improved to realize a high H sensitive analysis with a detection limit of several 킽/g. For this purpose, first, we clarified the origin of the H emission disturbance coming from H<sub>2</sub>O molecules; namely, we showed that most of the H emission came from H<sub>2</sub>O on the metal surface and not from H<sub>2</sub>O existing in the surrounding gas when we formed a laser-induced gas plasma. Second, the difference in the emission characteristics between the H emission from H<sub>2</sub>O on the metal surface and H emission from inside in sample was studied to determine the optimum gating time of the optical multi-channel analyzer (OMA). Third, the gas plasma was totally covered by fresh helium gas using a big pipe (5 mm in diameter) and by flowing a high amount of He (10 l/min). Also, we demonstrated that our methods could potentially be applied to H analysis in steel samples, where an H analysis with a sensitivity of less than 1 킽/g is required without employing a heating process, by removing H<sub>2</sub>O on the sample surface with the aid of defocused TEA CO<sub>2</sub> laser irradiation. Thus, we stress that our method can be used for a highly sensitive, <i>in-situ</i> analysis of H for metal samples.
Khumaeni, Ali,Lie, Zener Sukra,Niki, Hideaki,Lee, Yong Inn,Kurihara, Kazuyoshi,Wakasugi, Motoomi,Takahashi, Touru,Kagawa, Kiichiro The Optical Society 2012 Applied Optics Vol.51 No.7
<P>Taking advantage of the specific characteristics of a transversely excited atmospheric (TEA) CO(2) laser, a sophisticated technique for the analysis of chromated copper arsenate (CCA) in wood samples has been developed. In this study, a CCA-treated wood sample with a dimension of 20 mm 20 mm and a thickness of 2 mm was attached in contact to a nickel plate (20 mm 20 mm 0.15 mm), which functions as a subtarget. When the TEA CO(2) laser was successively irradiated onto the wood surface, a hole with a diameter of approximately 2.5 mm was produced inside the sample and the laser beam was directly impinged onto the metal subtarget. Strong and stable gas plasma with a very large diameter of approximately 10 mm was induced once the laser beam had directly struck the metal subtarget. This gas plasma then interacted with the fine particles of the sample inside the hole and finally the particles were effectively dissociated and excited in the gas plasma region. By using this technique, high precision and sensitive analysis of CCA-treated wood sample was realized. A linear calibration curve of Cr was successfully made using the CCA-treated wood sample. The detection limits of Cr, Cu, and As were estimated to be approximately 1, 2, and 15 mg/kg, respectively. In the case of standard LIBS using the Nd:YAG laser, the analytical intensities fluctuate and the detection limit was much lower at approximately one-tenth that of TEA CO(2) laser.</P>
Defects mediated diffusion in Pt/Co/Pt multilayers induced by dense electronic excitations
Neeru Sehdev,Rohit Medwal,Zener Sukra Lie,Dinesh Chandra Agarwal,K. Asokan,D. Kanjilal,S.Annapoorni 한국물리학회 2014 Current Applied Physics Vol.14 No.3
Present study compares the effects of 200 MeV Ag15þ and 100 MeV O7þ ion irradiations on the structural, interfacial mixing and magnetic properties of annealed Pt/Co/Pt layers fabricated by DC magnetron sputtering. X-ray diffraction analysis shows that ion irradiations coupled with post annealing results in the formation of the face centred tetragonal L10 CoPt phase. Irradiation using 200 MeV Ag15þ ions having higher ionizing energy transfer to the film was found to be more efficient in causing structural phase transition as compared with that using 100 MeV energy O7þ ions having lower ionizing energy transfer at similar fluence. Rutherford back scattering analysis reveals the role of defect mediated inter-atomic diffusion in tailoring the alloy composition of the film irradiated by different energetic ions. A broad magnetic switching field distribution for O7þ ion irradiated films compared to Ag15þ ion irradiation was evident from the magnetic measurements. The contribution of alloy composition to switching field distribution has been discussed in details. Above results showed that the electronic energy loss and fluence dependent defects, generated by irradiation, played an important role in tuning the structural, atomic diffusion and magnetic reversal properties of Pt/Co/Pt.
Ali Khumaeni,Kazuyoshi Kurihara,Zener Sukra Lie,Kiichiro Kagawa,이용인 한국물리학회 2014 Current Applied Physics Vol.14 No.3
Taking advantages of the special characteristics of a transversely excited atmospheric (TEA) CO2 laser, the analysis of sodium aerosol has been successfully conducted by using laser-induced gas plasma spectroscopy (LIGPS) method. In this study, the sodium aerosol was deposited on a nickel metal plate; the metal plate functions as a subtarget to initiate a gas plasma. When a pulsed TEA CO2 laser was focused on the metal surface, a large-volume and high-temperature gas plasma was induced. The fine particles of sodium then entered into the gas plasma region to be dissociated and excited. By using this technique, a semi quantitative analysis of sodium aerosol was made. The detection limit of sodium was approximately 200 ppb.