title: Analysis of trace impurities in neon by a customized gas chromatography.
abstract: Excimer lasers, widely used in the semiconductor industry, are crucial for analyzing the purity of premix laser gases for the purpose of controlling stable laser output power. In this study, we designed a system for analyzing impurities in pure neon (Ne) base gas by customized GC. Impurities in pure neon (H2 and He), which cannot be analyzed at the sub-μmol/mol level using commercial GC detectors, were analyzed by a customized pulsed-discharge Ne ionization detector (PDNeD) and a pressurized injection thermal conductivity detector using Ne as the carrier gas (Pres. Inj. Ne-TCD). From the results, trace species in Ne were identified with the following detection limits: H2, 0.378μmol/mol; O2, 0.119μmol/mol; CH4, 0.880μmol/mol; CO, 0.263μmol/mol; CO2, 0.162μmol/mol (PDNeD); and He, 0.190μmol/mol (Pres. Inj. Ne-TCD). This PDNeD and pressurized injection Ne-TCD technique thus developed permit the quantification of trace impurities present in high-purity Ne.
authors.affiliation: Department of Chemistry, Chungnam National University, Daejeon 305-764, Republic of Korea; Center for Gas Analysis, KRISS, Daejeon 305-340, Republic of Korea.
authors.forename: Min Kyo
authors.initials: MK
authors.lastname: Yin
authors.affiliation: Center for Gas Analysis, KRISS, Daejeon 305-340, Republic of Korea.
authors.forename: Jeong Sik
authors.initials: JS
authors.lastname: Lim
authors.affiliation: Center for Gas Analysis, KRISS, Daejeon 305-340, Republic of Korea.
authors.forename: Dong Min
authors.initials: DM
authors.lastname: Moon
authors.affiliation: Department of Chemistry, Chungnam National University, Daejeon 305-764, Republic of Korea.
authors.forename: Gae Ho
authors.initials: GH
authors.lastname: Lee
authors.affiliation: Center for Gas Analysis, KRISS, Daejeon 305-340, Republic of Korea. Electronic address: leejs@kriss.re.kr.
authors.forename: Jeongsoon
authors.initials: J
authors.lastname: Lee
mesh_terms: D002849:Chromatography, Gas / Q000379:methods*; D004340:Drug Contamination; D005740:Gases / Q000032:analysis* / Q000737:chemistry*; D006371:Helium / Q000032:analysis; D057230:Limit of Detection; D009356:Neon / Q000032:analysis / Q000737:chemistry*; D011312:Pressure; D013814:Thermal Conductivity
chemical_list: D005740:Gases; D006371:Helium; D009356:Neon
keywords: Excimer laser; Modified GC-TCD-PDNeD; PDNeD; Pressurized injection Ne-TCD