研究目的
To demonstrate the three-dimensional trapping of yttrium monoxide (YO) using a radio-frequency magneto-optical trap (MOT) and to explore the feasibility of extending this technique to more complex nonlinear molecules.
研究成果
The successful demonstration of a 3D MOT for YO broadens the horizon of chemical diversity of cooled molecules and paves the way for further cooling to the microkelvin regime. This work also indicates that MOTs of more complex nonlinear molecules should be feasible.
研究不足
The lifetime of the MOT is currently limited to ～20 ms by an undetermined loss process. The experiment also faces challenges in maintaining a quasi-closed optical cycle due to leakage to intermediate electronic states.
1：Experimental Design and Method Selection:
Utilized a radio-frequency magneto-optical trap (MOT) for three-dimensional trapping of YO molecules. The experiment involved laser cooling and trapping techniques.
2：Sample Selection and Data Sources:
Yttrium monoxide (YO) molecules were produced via ablation of a Y2O3 ceramic target with a doubled (532 nm) Nd:YAG laser pulse.
3：List of Experimental Equipment and Materials:
Included a cryogenic buffer gas cell, microwave horns, charge-coupled device (CCD) camera, photomultiplier tube (PMT), and various lasers for cooling and repumping.
4：Experimental Procedures and Operational Workflow:
Molecules were slowed from production speeds to trappable velocities using frequency-chirped lasers and loaded into the MOT. The MOT's performance was characterized by measuring the number of trapped molecules and their temperature.
5：Data Analysis Methods:
The temperature of the MOT was determined by fitting the cloud to a Gaussian distribution and measuring the width as a function of free-flight time.
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