Experimental Study of Temperatures of Atmospheric-Pressure Nonequilibrium Ar/N₂ Plasma Jets and Poly(ethylene terephtalate)-Surface Processing

Abstract

The laser emission of YAIO3:Er at 1.663 pm was investigated in order to find the best conditions with respect to crystal orientation, Er concentration. and output coupling. Using ten different laser rods the following optimised data have been obtained: b axis laser rod(Pnmanotation),1.25%Erdoping,and857~outputmirrorreflectivity.Thetemperature dependence of laser threshold and efficiency was measured between -50" and 50 "C. At room temperature we obtained34 J thresholdenergy and0.07% slope efficiency. In addition laser emission of LiYFJ:Ho, Er, Tm at 2.065 pm was investigated. The slope efficiency was 0.22%. Laser emission of YA103:Ho, Er, Tm at 2.12 pm is briefly mentioned.

Progresses in Experimental Study of N2 Plasma Diagnostics by Optical Emission Spectroscopy

“…The population density of rotational levels is generally found to obey the Boltzmann distribution, at least for C 3  u state, which we have confirmed for many 2PS spectra observed experimentally by theoretical fitting Sakamoto et al, 2006;Yuji et al, 2007;Nunomura et al, 2006). On the other hand, the vibrational levels of N 2 C 3  u state do not obey the Boltzmann distribution in general due to complicated kinetics to form vibrational levels, as later shown in section 6.…”

“…These temperatures are determined as best theoretical fitting parameters for the spectrum observed experimentally. Observation of this band is also easy from the experimental point of view (Phillips, 1976;Koike et al, 2004;Kobori et al, 2004;Yuji et al, 2007).…”

“…obtained because of the cooling of neutral component of discharge species, since it is mostly heated at the discharge position z = 0. Consequently, the variation in the rotational temperature is considered to be useful for the analysis of macroscopic thermal structure of nitrogen plasma, which is mostly determined by the temperature of neutral particles (Nunomura et al, 2006;Yuji et al, 2007Yuji et al, , 2008.…”

High H Radical Density Produced by 1-m-Long Atmospheric Pressure Microwave Plasma System

“…The gas temperature is estimated by curve fitting between the experimental and simulation results of the emission of the N 2 second positive band (C 3 Å u -B 3 Å g ). 8) Figure 2 shows an example of curve fitting of the N 2 second positive band spectra between experimental and simulation spectra. Firstly, we measured the rotational spectral intensity of discharged N 2 under the assumption of the Boltzmann distribution, and calculated the N 2 second positive band intensity.…”

Transport Mechanism of Chemical Species in a Pin-water Atmospheric Discharge driven by Negative Voltage

“…Both the rotational and vibrational temperature of N 2 were evaluated from the spectrum of the N 2 second positive system by the fitting curve method [15]- [19].…”