Ⅰ. INTRODUCTION In the method of ESR dating of quartz grains in loess, the determination of the previously acquired geological dose is an important step. It has been supposed that by exposure to sunlight the ESR sign...Ⅰ. INTRODUCTION In the method of ESR dating of quartz grains in loess, the determination of the previously acquired geological dose is an important step. It has been supposed that by exposure to sunlight the ESR signal intensity of E′ center in quartz grains could be erased to zero or a limit value when the loess was transported by wind from desert to the deposition site, be-展开更多
We created an ultracold plasma by photoionizing the laser-cooled and trapped rubidium atoms in a magneto-optical trap. In the externally applied direct current（DC） electric field environment,the electrons which esca...We created an ultracold plasma by photoionizing the laser-cooled and trapped rubidium atoms in a magneto-optical trap. In the externally applied direct current（DC） electric field environment,the electrons which escape from the potential well of the ultracold plasma were detected for different numbers of the ions and initial kinetic energies of the electrons. The results are in good agreement with the calculations, based on the Coulomb potential well model, indicating that the external DC field is an effective tool to adjust the depth of potential well of the plasma, and it is possible to create an ultracold plasma in a controlled manner.展开更多
基金Project supported by the Structure Research Laboratory, Academia Sinica and Union Foundation of Seismological Science
文摘Ⅰ. INTRODUCTION In the method of ESR dating of quartz grains in loess, the determination of the previously acquired geological dose is an important step. It has been supposed that by exposure to sunlight the ESR signal intensity of E′ center in quartz grains could be erased to zero or a limit value when the loess was transported by wind from desert to the deposition site, be-
基金supported by the National Key R&D Program of China(Grant No.2017YFA0402300)National Natural Science Foundation of China(Grant No.11404346)+1 种基金the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB21030900)financial support of CAS-TWAS President’s Fellowship Program for International Ph D students
文摘We created an ultracold plasma by photoionizing the laser-cooled and trapped rubidium atoms in a magneto-optical trap. In the externally applied direct current（DC） electric field environment,the electrons which escape from the potential well of the ultracold plasma were detected for different numbers of the ions and initial kinetic energies of the electrons. The results are in good agreement with the calculations, based on the Coulomb potential well model, indicating that the external DC field is an effective tool to adjust the depth of potential well of the plasma, and it is possible to create an ultracold plasma in a controlled manner.
