科研之友
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摘要
We have developed an all-optical method for measuring the lifetimes of nS and nD Rydberg states and demonstrate its capabilities with measurements on a dilute cloud of ultracold Rb-87 atoms in a cryogenic environment. The method is based on the time-resolved observation of resonant light absorption by ground-state atoms and selective transfer of Rydberg atoms into the ground state at varying delay times in order to reconstruct Rydberg decay curves. Our measurements of the Rb-87 30S(1/2) state indicate an increase of the lifetime at lowered environment temperatures, as expected due to decreased blackbody radiation. For the 38D(5/2) state with an attractive dipole-dipole interaction, ionization and lifetime reduction due to collisional effects are observed.
- 出版日期2015-7-24
