プログラム

オーラルセッション

第3日　5月17日（木）　10:45～11:00　B会場（星雲1）

3B-O1-M-1045　　PDF

暗流励起アルゴンを用いたアンビエント質量分析法の開発

(¹横市大院生命ナノ・ ²エーエムアール)
^o関本奏子¹・ 坂倉幹始²・ 比毛浩²・ 川向孝知²・ 塩田晃久²・ 高山光男¹

Dark current discharge was examined with the Direct Analysis in Real Time (DART) ionization technique operated with argon gas. No ions were observed in the ambient background spectrum of argon DART only. If dark current discharge was generated in the analyte ionization area of the argon DART, background ions were readily observed. When various amino acids and anisole were introduced in the dark current discharge condition, (de)protonated molecules were dominantly formed for all the analytes. The resulting mass spectral pattern was quite similar to that observed in conventional DART using glow discharge and helium gas. This meant that ionization characteristics in dark current discharge with argon are comparable to those in helium DART. It suggested therefore that the dark current discharge forms excited argons which have ionization energy higher than metastable states and can occur Penning ionization with H₂O to generate a reagent ion H₃O⁺ for analyte protonation.