中文摘要：

在无放射性辉光放电离子源内,采用不同试剂气体进行放电,为质子转移反应质谱（PTR-MS）新增了强度在105 cps量级的3种反应离子NH4＋,NO＋和O2＋,纯度大于95%;测试了这3种反应离子的离子-分子反应特征.采用H3O＋,NH4＋,NO＋和O2＋等4种反应离子对同分异构体丙醛/丙酮进行检测发现,H3O＋和NH 4＋均不能区分的丙醛/丙酮可采用NO＋或O 2＋进行区分.结果表明,增加反应离子不仅使PTR-MS的可检测有机物范围不再局限于质子亲和势（PA）大于H2O的有机物,还提高了PTR-MS区分同分异构体的能力.

英文摘要：

Clean sources of reagent ions H3O＋,NH＋4,NO＋ and O＋2 were obtained in conventional proton transfer reaction mass spectrometry（PTR-MS） without any radioactive substance and any mass pre-selection.The intensity of these reagents is at 105cps.Three kinds of new reagents,NH＋4,NO＋ and O＋2 tested with some volatile organic compounds（VOCs） show different ionization characters.The isomers propanal and acetone were detected with reagent ions H3O＋,NH＋4,NO＋ and O＋2.The results show that NO＋ and O＋2 can discriminate propanal from acetone.New multi-reagent ions PTR-MS can detect more compounds,whose proton affinities（PA） are not always higher than that of H2O（691.0 kJ/mol）.And it is shown to be a more versatile technique than conventional PTR-MS with the potential for analysis of isocompounds.