原子与分子物理学报, 2007, 24 (4): 799, 网络出版: 2009-04-22
A1等离子体与甲醇团簇的反应
Reactions of aluminum plasma With methanol clusters
团簇 反应机理 激光烧蚀 分子束法 A1等离子体 甲醇 飞行时间质谱 cluster formation mechanism laser ablation- molecular beam method aluminum plasma methanol cluster time-of-flight mass spectrum
摘要
利用激光烧蚀.分子束法(LA-MB)对激光烧蚀金属铝靶产生的A1等离子体与脉冲分子束超声膨胀产生的(CH30H)n团簇在气相条件下的反应进行了研究.烧蚀激光相对于脉冲分子束之间的延时不同,观测到团簇离子序列及团簇尺寸的变化,反映出脉冲分子束状态对反应条件及激光烧蚀等离子体状态的影响.在激光烧蚀发生于脉冲分子束的前段,主要反应产物为A1+(H3OH)n,但团簇尺寸较小;在烧蚀发生于脉冲分子束的中段,主要产物为H+(CH3OH)n,团簇尺寸增大,强度减弱;在烧蚀发生于脉冲分子束的后段,现测到尺寸更大的水合质子化团簇H+(H2O)m(CH3OH)n.结合团簇离子速度分布的特征,对团簇的产生机理进行了讨论.
Abstract
Laser ablation-molecular beam (LA-MB) is a useful method to study metal ion reacting with molecular clusters. Reactions of aluminum plasma with methanol clusters have been studied. A special designed reaction cell is used as a fast flow reactor operated under thermal condition and the reaction products are measured with time-of-flight (TOF) mass spectrometer. Several series cluster ions such as Al+(CH3OH)n, H+ (CH3OH)n ,H+ (H2O)m(CH3OH)n , and H+O(CH3)2(CH3OH)n have been observed when the laser ablating at different part of the molecular beam. The formation mechanisms are discussed combined with cluster ions speeds characteristics.
张树东, 孔祥和, 蔡廷东, 许明坤. A1等离子体与甲醇团簇的反应[J]. 原子与分子物理学报, 2007, 24(4): 799. 张树东, 孔祥和, 蔡廷东, 许明坤. Reactions of aluminum plasma With methanol clusters[J]. Journal of Atomic and Molecular Physics, 2007, 24(4): 799.