Al等离子体与甲醇团簇的反应(英文)

Reactions of aluminum plasma with methanol clusters

利用激光烧蚀-分子束法(LA-MB)对激光烧蚀金属铝靶产生的Al等离子体与脉冲分子束超声膨胀产生的(CH3OH)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Al+(CH3OH)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,观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.

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.