研究目的
Investigating the photoionization cross sections of the 5S1/2 and 5P3/2 states of 87Rb in a two-species Hg and Rb magneto-optical trap (MOT) by the cooling laser for Hg.
研究成果
The photoionization cross sections of Rb at 253.7 nm were determined to be 1.0+4.3 × 10?20 cm2 and 4.63(30) × 10?18 cm2 for the 5S1/2 and 5P3/2 states, respectively. The photoionization cross section for the 5P3/2 state at 401.5 nm was found to be 1.18(10) × 10?17 cm2. These results are consistent with previous data and confirm the small cross section for photoionization of Rb close to 254 nm, which is crucial for minimizing Rb losses in the presence of Hg MOT.
研究不足
The study is limited by the accuracy of the measurements of the Rb MOT radii, the waist, and the intensity of the ionization beam, as well as the statistical spread of the differences between decaying rates.
1：Experimental Design and Method Selection:
The study involved measuring the photoionization cross sections of Rb in the presence of Hg cooling laser light. The method included detecting the photoionization rate of the 5P3/2 state by an additional 401.5 nm laser.
2：5 nm laser.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The experiment used a two-species Hg and Rb magneto-optical trap setup. The Rb atoms were confined within the MOT and exposed to ionizing radiation.
3：List of Experimental Equipment and Materials:
The setup included commercial external-cavity diode lasers (ECDLs) for cooling and repumping Rb, a fiber-coupled tapered amplifier, a system for frequency-quadrupling laser light, and a vacuum system with a science chamber.
4：Experimental Procedures and Operational Workflow:
The experiment involved measuring the loading curves of the Rb MOT with and without the presence of the Hg cooling beams, and determining the photoionization rates from the decay of trap fluorescence.
5：Data Analysis Methods:
The photoionization cross sections were determined by analyzing the dependence of the photoionization rate on the photoionizing laser intensity and the excited-state fraction.
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