简介：Netemissioncoefficientsofradiationwerecalculatedforisothermalplasmaofmethaneasafunctionoftheplasmatemperature5,000～30,000Kandthearcradius0mmto10mmatatmosphericpressure.Calculationstakeintoaccountcontinuumandlineradiations,specialattentionhasalsobeengiventotheinfluenceofoverlappingspectrallines.ThelineshapesinourcalculationsaregivenbyconvolutionofDopplerandLorentzprofiles,resultinginasimplifiedVoigtprofile.Inthecaseofahydrogenprofile,weusedtheVidaltables,andthefourfirstLymanlinesandthefourfirstBalmerlineswereconsidered.Thiscalculationwascarriedoutontheassumptionoflocalthermodynamicequilibriumandinanondiffusiveenvironment.ThenetemissioncoefficientcalculationforpureargonplasmawascomparedwiththeexperimentalresultsofEvansinourpreviouswork.Weusedtheescapefactor,andourresultswerehigherthanthoseoftheexperiment.Inthispaper,weexplainwhy,usingtheescapefactor,theradiationisoverestimated.ThenetemissioncoefficientobtainedfromarealspectrumwascomparedwithEssoltaniwork’swhichusedtheline-by-linemethodforpureargonplasma.
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