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报道了用质谱学方法首次测得的大气中各种水的团簇分布情况.表明在室内大气环境下,水主要是以几个至几十个水分子所组成的分子团簇的形式存在,且团簇的分布与空气湿度,即水在空气中的分压有关.实验中,除观测到空气中也存在前人已报道过的具有笼状结构的H+(H2O)21外,还观测到其他几种较稳定结构的水的团簇,即H+(H2O)4,H+(H2O)10和H+(H2O)15.实验中所测得的水分子团簇分布结果与使用的离子源以及质量分析器种类无关.我们还用碰撞诱导解离(CID)的方法研究了H+(H2O)n(n=4～16)离子的碰撞解离产物,结果表明,对于H+(H2O)n(n=4～16)的离子,其较稳定的离子的碰撞解离产物均为H+(H2O)n(n=4～6).我们还进一步研究了H+(H2O)10离子的碰撞解离产物与碰撞气体(即Ar气)密度的关系,得到了碰撞气体密度与碰撞解离产物分布的关系.
Reported the mass distribution of various water species in the atmosphere measured by mass spectrometry for the first time, indicating that water is mainly in the form of molecular clusters consisting of several to several dozen water molecules under the indoor atmospheric environment, And the distribution of the clusters is related to the humidity of air, that is, the partial pressure of water in the air.In addition to the H + (H2O) 21 with cage structure previously reported in the air, Other clusters of water with relatively stable structures, namely, H + (H2O) 4, H + (H2O) 10 and H + (H2O) 15, were used to determine the distribution of water molecules and the ion source used as well as the mass We also used collision-induced dissociation (CID) to study the collision and dissociation products of H + (H2O) n (n = 4 ~ 16) ions. The results show that for H + 4 ~ 16), and the collisions and dissociation products of the more stable ions are all H + (H2O) n (n = 4 ~ 6) .We also further studied the collision and dissociation products of H + (H2O) Gas (Ar gas) density relationship between collision gas density and collisional dissociation products distribution.