Deceleration of Metastable Li+ Beam by Combining Electrostatic Lens and Ion Trap TechniqueSupported by the Scientific Instrument Developing Project of the National Natural Science Foundation of China (Grant Nos. 11934014, 11622434, and 11804373), the Scientific Instrument Developing Project of the Chinese Academy of Sciences (Grant No. YZ201552), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant Nos.

Abstract

Ion deceleration has played a critical role in ion-related research when the ions are produced in the form of a high-energy beam. We present a deceleration method combining electrostatic lens and ion trap technique, which can effectively decelerate ions to energy below the trapping potential of a typical ion trap. The experiments were performed on metastable 1s2s 3S1 Li+ ions, and demonstrated that the kinetic energy could easily be reduced from ∼450 eV to a few eV, with the latter being confirmed using the Doppler-shifted fluorescence spectra.