The Characteristic Of Beam Dentity Of Metal Nanoclusters

With the continuous development of ultra short and ultra intense laser, the interaction between cluster and laser has attracted wide attention. The self characteristics of clusters have great influence on the interaction of clusters with the laser. Current beam density is one of the characteristic parameters of metal nanocluster beam. It directly influences the intensity of the signal when ultra short ultra intense laser irradiate cluster beam. Therefore, it is very important to prepare metal cluster beam with controllable and measurable beam current density.Cu nanoclusters were deposited on substrates through Cu nanocluster beams which were generated by the plasma gas condensation combining with the differential pumping. The deposition rate was measured online by using the quartz crystal film thickness monitor. Effects of the deposition rate of films were studied, such as sputtering current,Ar flow rate and aggregation zone length. We have established the converging electric field focusing system for cluster beam, exploring the influence of the shape and electric field intensity of the converging electric field on the focusing effect. The specific content and conclusions of this thesis are as follows.1.Cu and Cu-Au alloy cluster beams with controlled deposition rate can be prepared by using the cluster source, and the film deposition rate can be measured online by using the quartz crystal thin film monitor.2.A mathematical model for the relationship between the deposition rate and the current beam density is established.3.By adjusting the process parameters to improve the current beam density, and the influence of the parameters on the current beam density was analyzed. Cluster beam current density can be precisely controlled.4. Cluster beam focusing system is designed and built, which can increase the Current beam density of cluster beam by up to 7 times.