The Experts below are selected from a list of 229728 Experts worldwide ranked by ideXlab platform
Naoto Koshizaki - One of the best experts on this subject based on the ideXlab platform.
-
method to determine argon metastable number density and plasma electron temperature from Spectral Emission originating from four 4p argon levels
arXiv: Plasma Physics, 2010Co-Authors: Davide Mariotti, Yoshiki Shimizu, Takeshi Sasaki, Naoto KoshizakiAbstract:A simple model and method is proposed here to determine argon metastable number densities and electron temperature with the assumption of a Maxwell-Boltzmann electron energy distribution. This method is based on the availability of experimental relative Emission intensities of only four argon lines that originate from any of the 4p argon levels. The proposed model has a relatively wide range of validity for laboratory plasmas that contain argon gas and can be a valuable tool for the emerging field of atmospheric microplasmas, for which diagnostics is still limited.
-
nanostructured hydroxyapatite tio2 composite coating applied to commercially pure titanium by a co sputtering technique
Nanotechnology, 2008Co-Authors: Baekhee Lee, Naoto KoshizakiAbstract:We demonstrate an approach for the coating of nanostructured hydroxyapatite(HAP)/TiO2 composite on commercially pure Ti (CP-Ti) by a co-sputtering process. HAP/TiO2 composite film was obtained by controlling the processing pressure. It was observed that decomposition of HAP into CaO was easily induced during sputtering at 0.53 Pa, a typical sputtering condition for film deposition. However, HAP/TiO2 composite film was obtained with the sputtering pressure of 2.67 Pa. The Ca/P ratio was nearly maintained at 1.66 by sputter deposition at 2.67 Pa. We further confirmed by analysis of plasma Spectral Emission that the variation of the hydroxyl (OH) radical present was due to the Ar pressure during sputtering. It has been shown that HAP coatings are dependent on the processing pressure, which the hydroxyl radical requires in order to create HAP.
-
gas temperature and electron temperature measurements by Emission spectroscopy for an atmospheric microplasma
Journal of Applied Physics, 2007Co-Authors: Davide Mariotti, Yoshiki Shimizu, Takeshi Sasaki, Naoto KoshizakiAbstract:A microplasma suitable for material processing at atmospheric pressure in argon and argon-oxygen mixtures is being studied here. The microplasma is ignited by a high voltage dc pulse and sustained by low power (1–5W) at 450MHz. the mechanisms responsible for sustaining the microplasma require a more detailed analysis, which will be the subject of further study. Here it is shown that the microplasma is in nonequilibrium and appears to be in glow mode. The effect of power and oxygen content is also analyzed in terms of gas temperature and electron temperature. Both the gas temperature and the electron temperature have been determined by Spectral Emission and for the latter a very simple method has been used based on a collisional-radiative model. It is observed that power coupling is affected by a combination of factors and that prediction and control of the energy flow are not always straightforward even for simple argon plasmas. Varying gas content concentration has shown that oxygen creates a preferentia...
-
method to determine argon metastable number density and plasma electron temperature from Spectral Emission originating from four 4p argon levels
Applied Physics Letters, 2006Co-Authors: Davide Mariotti, Yoshiki Shimizu, Takeshi Sasaki, Naoto KoshizakiAbstract:A simple model and method is proposed here to determine argon metastable number densities and electron temperature with the assumption of a Maxwell-Boltzmann electron energy distribution. This method is based on the availability of experimental relative Emission intensities of only four argon lines that originate from any of the 4p argon levels. The proposed model has a relatively wide range of validity for laboratory plasmas that contain argon gas and can be a valuable tool for the emerging field of atmospheric microplasmas, for which diagnostics is still limited. © 2006 American Institute of Physics. DOI: 10.1063/1.2390631 Plasmas are finding interest in a large number of applications and are becoming increasingly exploitable in already established plasma fields such as in material processing. This trend in plasma science is mainly due to a greater knowledge of the behavior of laboratory and technological plasmas. Diagnostic techniques play a major role in understanding plasmas and can help predicting the potential of plasmas when used for future applications. In particular, Emission spectroscopy has revealed extremely useful insights when supported by very simple computational techniques. 1‐7 One of the advantages of Emission spectroscopy is undoubtedly the noninvasive character; the practicality and the availability of low cost spectroscopy equipment have also been an incitement to the use of this diagnostic technique.
Richard E Russo - One of the best experts on this subject based on the ideXlab platform.
-
spatially and temporally resolved Spectral Emission of laser induced plasmas confined by cylindrical cavities
Journal of Analytical Atomic Spectrometry, 2014Co-Authors: Zhe Wang, Xianglei Mao, Richard E RussoAbstract:Laser-induced plasmas generated on pure copper samples in air with and without the presence of cylindrical cavities were investigated using spatially and temporally resolved spectroscopic measurements. The cylindrical cavities with variable diameters (3, 4 and 5 mm) and variable heights (1, 2, and 3 mm) were fabricated in quartz glass and placed on the sample surface and around the focused laser beam. Compared with plasmas generated without the cavity, the Spectral Emission intensities of plasmas generated with cylindrical cavities were enhanced after several microseconds, and the enhanced Emission regions moved to higher locations above the sample with time. Plasma spatial and temporal Emission was influenced by cavity diameter. As the diameter increased from 3 to 5 mm, the Spectral Emission was enhanced later in time and the enhancement became weaker. Plasma spatial and temporal Emission was not significantly influenced by cavity height if the cavity was higher than the vapor plume. Shock wave theory was utilized to explain the observed phenomena.
-
early stage expansion and time resolved Spectral Emission of laser induced plasma from polymer
Applied Surface Science, 2009Co-Authors: Myriam Boueri, Xianglei Mao, Matthieu Baudelet, Samuel S Mao, Richard E RussoAbstract:In the nanosecond laser ablation regime, absorption of laser energy by the plasma during its early stage expansion critically influences the properties of the plasma and thus its interaction with ambient air. These influences can significantly alter Spectral Emission of the plasma. For organic samples especially, recombination of the plasma with the ambient air leads to interfering Emissions with respect to Emissions due to native species evaporated from the sample. Distinguishing interfering Emissions due to ambient air represents a critical issue for the application of laser-induced breakdown spectroscopy (LIBS) to the analysis of organic materials. In this paper, we report observations of early stage expansion and interaction with ambient air of the plasma induced on a typical organic sample (nylon) using time-resolved shadowgraph. We compare, in the nanosecond ablation regime, plasmas induced by infrared (IR) laser pulses (1064 nm) and ultraviolet (UV) laser pulses (266 nm). Nanosecond ablation is compared with femtosecond ablation where the post-ablation interaction is absent. Subsequent to the early stage expansion, we observe for each studied ablation regime, Spectral Emission from CN, a typical radical for organic and biological samples. Time-resolved LIBS allows identifying Emissions from native molecular species and those due to recombination with ambient air through their different time evolution behaviors.
Davide Mariotti - One of the best experts on this subject based on the ideXlab platform.
-
method to determine argon metastable number density and plasma electron temperature from Spectral Emission originating from four 4p argon levels
arXiv: Plasma Physics, 2010Co-Authors: Davide Mariotti, Yoshiki Shimizu, Takeshi Sasaki, Naoto KoshizakiAbstract:A simple model and method is proposed here to determine argon metastable number densities and electron temperature with the assumption of a Maxwell-Boltzmann electron energy distribution. This method is based on the availability of experimental relative Emission intensities of only four argon lines that originate from any of the 4p argon levels. The proposed model has a relatively wide range of validity for laboratory plasmas that contain argon gas and can be a valuable tool for the emerging field of atmospheric microplasmas, for which diagnostics is still limited.
-
gas temperature and electron temperature measurements by Emission spectroscopy for an atmospheric microplasma
Journal of Applied Physics, 2007Co-Authors: Davide Mariotti, Yoshiki Shimizu, Takeshi Sasaki, Naoto KoshizakiAbstract:A microplasma suitable for material processing at atmospheric pressure in argon and argon-oxygen mixtures is being studied here. The microplasma is ignited by a high voltage dc pulse and sustained by low power (1–5W) at 450MHz. the mechanisms responsible for sustaining the microplasma require a more detailed analysis, which will be the subject of further study. Here it is shown that the microplasma is in nonequilibrium and appears to be in glow mode. The effect of power and oxygen content is also analyzed in terms of gas temperature and electron temperature. Both the gas temperature and the electron temperature have been determined by Spectral Emission and for the latter a very simple method has been used based on a collisional-radiative model. It is observed that power coupling is affected by a combination of factors and that prediction and control of the energy flow are not always straightforward even for simple argon plasmas. Varying gas content concentration has shown that oxygen creates a preferentia...
-
method to determine argon metastable number density and plasma electron temperature from Spectral Emission originating from four 4p argon levels
Applied Physics Letters, 2006Co-Authors: Davide Mariotti, Yoshiki Shimizu, Takeshi Sasaki, Naoto KoshizakiAbstract:A simple model and method is proposed here to determine argon metastable number densities and electron temperature with the assumption of a Maxwell-Boltzmann electron energy distribution. This method is based on the availability of experimental relative Emission intensities of only four argon lines that originate from any of the 4p argon levels. The proposed model has a relatively wide range of validity for laboratory plasmas that contain argon gas and can be a valuable tool for the emerging field of atmospheric microplasmas, for which diagnostics is still limited. © 2006 American Institute of Physics. DOI: 10.1063/1.2390631 Plasmas are finding interest in a large number of applications and are becoming increasingly exploitable in already established plasma fields such as in material processing. This trend in plasma science is mainly due to a greater knowledge of the behavior of laboratory and technological plasmas. Diagnostic techniques play a major role in understanding plasmas and can help predicting the potential of plasmas when used for future applications. In particular, Emission spectroscopy has revealed extremely useful insights when supported by very simple computational techniques. 1‐7 One of the advantages of Emission spectroscopy is undoubtedly the noninvasive character; the practicality and the availability of low cost spectroscopy equipment have also been an incitement to the use of this diagnostic technique.
Yoshiki Shimizu - One of the best experts on this subject based on the ideXlab platform.
-
method to determine argon metastable number density and plasma electron temperature from Spectral Emission originating from four 4p argon levels
arXiv: Plasma Physics, 2010Co-Authors: Davide Mariotti, Yoshiki Shimizu, Takeshi Sasaki, Naoto KoshizakiAbstract:A simple model and method is proposed here to determine argon metastable number densities and electron temperature with the assumption of a Maxwell-Boltzmann electron energy distribution. This method is based on the availability of experimental relative Emission intensities of only four argon lines that originate from any of the 4p argon levels. The proposed model has a relatively wide range of validity for laboratory plasmas that contain argon gas and can be a valuable tool for the emerging field of atmospheric microplasmas, for which diagnostics is still limited.
-
gas temperature and electron temperature measurements by Emission spectroscopy for an atmospheric microplasma
Journal of Applied Physics, 2007Co-Authors: Davide Mariotti, Yoshiki Shimizu, Takeshi Sasaki, Naoto KoshizakiAbstract:A microplasma suitable for material processing at atmospheric pressure in argon and argon-oxygen mixtures is being studied here. The microplasma is ignited by a high voltage dc pulse and sustained by low power (1–5W) at 450MHz. the mechanisms responsible for sustaining the microplasma require a more detailed analysis, which will be the subject of further study. Here it is shown that the microplasma is in nonequilibrium and appears to be in glow mode. The effect of power and oxygen content is also analyzed in terms of gas temperature and electron temperature. Both the gas temperature and the electron temperature have been determined by Spectral Emission and for the latter a very simple method has been used based on a collisional-radiative model. It is observed that power coupling is affected by a combination of factors and that prediction and control of the energy flow are not always straightforward even for simple argon plasmas. Varying gas content concentration has shown that oxygen creates a preferentia...
-
method to determine argon metastable number density and plasma electron temperature from Spectral Emission originating from four 4p argon levels
Applied Physics Letters, 2006Co-Authors: Davide Mariotti, Yoshiki Shimizu, Takeshi Sasaki, Naoto KoshizakiAbstract:A simple model and method is proposed here to determine argon metastable number densities and electron temperature with the assumption of a Maxwell-Boltzmann electron energy distribution. This method is based on the availability of experimental relative Emission intensities of only four argon lines that originate from any of the 4p argon levels. The proposed model has a relatively wide range of validity for laboratory plasmas that contain argon gas and can be a valuable tool for the emerging field of atmospheric microplasmas, for which diagnostics is still limited. © 2006 American Institute of Physics. DOI: 10.1063/1.2390631 Plasmas are finding interest in a large number of applications and are becoming increasingly exploitable in already established plasma fields such as in material processing. This trend in plasma science is mainly due to a greater knowledge of the behavior of laboratory and technological plasmas. Diagnostic techniques play a major role in understanding plasmas and can help predicting the potential of plasmas when used for future applications. In particular, Emission spectroscopy has revealed extremely useful insights when supported by very simple computational techniques. 1‐7 One of the advantages of Emission spectroscopy is undoubtedly the noninvasive character; the practicality and the availability of low cost spectroscopy equipment have also been an incitement to the use of this diagnostic technique.
Takeshi Sasaki - One of the best experts on this subject based on the ideXlab platform.
-
method to determine argon metastable number density and plasma electron temperature from Spectral Emission originating from four 4p argon levels
arXiv: Plasma Physics, 2010Co-Authors: Davide Mariotti, Yoshiki Shimizu, Takeshi Sasaki, Naoto KoshizakiAbstract:A simple model and method is proposed here to determine argon metastable number densities and electron temperature with the assumption of a Maxwell-Boltzmann electron energy distribution. This method is based on the availability of experimental relative Emission intensities of only four argon lines that originate from any of the 4p argon levels. The proposed model has a relatively wide range of validity for laboratory plasmas that contain argon gas and can be a valuable tool for the emerging field of atmospheric microplasmas, for which diagnostics is still limited.
-
gas temperature and electron temperature measurements by Emission spectroscopy for an atmospheric microplasma
Journal of Applied Physics, 2007Co-Authors: Davide Mariotti, Yoshiki Shimizu, Takeshi Sasaki, Naoto KoshizakiAbstract:A microplasma suitable for material processing at atmospheric pressure in argon and argon-oxygen mixtures is being studied here. The microplasma is ignited by a high voltage dc pulse and sustained by low power (1–5W) at 450MHz. the mechanisms responsible for sustaining the microplasma require a more detailed analysis, which will be the subject of further study. Here it is shown that the microplasma is in nonequilibrium and appears to be in glow mode. The effect of power and oxygen content is also analyzed in terms of gas temperature and electron temperature. Both the gas temperature and the electron temperature have been determined by Spectral Emission and for the latter a very simple method has been used based on a collisional-radiative model. It is observed that power coupling is affected by a combination of factors and that prediction and control of the energy flow are not always straightforward even for simple argon plasmas. Varying gas content concentration has shown that oxygen creates a preferentia...
-
method to determine argon metastable number density and plasma electron temperature from Spectral Emission originating from four 4p argon levels
Applied Physics Letters, 2006Co-Authors: Davide Mariotti, Yoshiki Shimizu, Takeshi Sasaki, Naoto KoshizakiAbstract:A simple model and method is proposed here to determine argon metastable number densities and electron temperature with the assumption of a Maxwell-Boltzmann electron energy distribution. This method is based on the availability of experimental relative Emission intensities of only four argon lines that originate from any of the 4p argon levels. The proposed model has a relatively wide range of validity for laboratory plasmas that contain argon gas and can be a valuable tool for the emerging field of atmospheric microplasmas, for which diagnostics is still limited. © 2006 American Institute of Physics. DOI: 10.1063/1.2390631 Plasmas are finding interest in a large number of applications and are becoming increasingly exploitable in already established plasma fields such as in material processing. This trend in plasma science is mainly due to a greater knowledge of the behavior of laboratory and technological plasmas. Diagnostic techniques play a major role in understanding plasmas and can help predicting the potential of plasmas when used for future applications. In particular, Emission spectroscopy has revealed extremely useful insights when supported by very simple computational techniques. 1‐7 One of the advantages of Emission spectroscopy is undoubtedly the noninvasive character; the practicality and the availability of low cost spectroscopy equipment have also been an incitement to the use of this diagnostic technique.
