Detection of Rare Cosmogenic lsotopes by Resonance lonization Spectroscopy

点击翻译按钮获取中文摘要

On the subject of this study ; " Detection of Rare Cosmogenic Isotopes by Resonance Ionization Spectroscopy " , we have been carried out the experiments in cooperation with co-worker as follovs.Fabrication of an ultra-high vacuum chamber for resonance ionization spectroscopyDevelopment of the neutral atomic beam sourcePulse - Heating methodLaser - Ablation methodFabrication of two-stage accelaration electrostatic lenses and improvement of mass-resolving power and ion detecting efficiencyIsotope separation of Mo atoms and measurements of isotope shifts of Mo stable isotopes It was found that pulse heating method as well as laser ablation method could be employed as simple and efficiently in-tense sources for generating neutral atomic beam, and could be applied to various form of samles and physical characteristics of elements. Furthemore, TOF mass-resolving power(M/DELTAM) of 350 was obtained using two-stage accelaration electrostatic lenses.In this work, we have demonstrated selective photoionization of Mo and presented measurement of isotope shifts seven stable Mo isotopes.