Xinhua News Agency, Hefei, December 2 (Reporter Xu Haitao) The reporter learned from the University of Science and Technology of China that Pan Jianwei, Zhao Bo and others from the University of Science and Technology of China recently prepared an ultracold triatomic molecule with a high phase space density for the first time in the world recently by using a coherent synthesis method. The ensemble is an important step towards the study of ultracold quantum chemistry and quantum simulation based on ultracold molecules. On December 2, the international authoritative academic journal “Science” published the results.
Using ultra-cold molecules to simulate chemical reaction processes can conduct accurate and comprehensive research on complex systems, so it has broad application prospects in scientific research and new material design. However, it is very difficult to prepare ultracold molecules due to the complexity of the vibrational energy levels inside the molecules.
At the beginning of this century, the international academic community successfully prepared potassium diatomic molecules. However, due to the extremely complex triatomic molecules, short lifetime and low synthesis efficiency, it is still a great challenge to directly detect and prepare ultracold triatomic molecular ensembles.
Recently, the USTC research team successfully used magnetic association technology for the first time to prepare an ensemble of ultracold triatomic molecules with high phase space density. They used radio frequency dissociation technology to dissociate triatomic molecules into free sodium and potassium molecules and atoms, and obtained dissociation spectra, thus realizing the direct detection of triatomic molecules.
The experimental results show that the phase space density of the triatomic molecular gas obtained by them is about 10 orders of magnitude higher than that of other methods. The preparation of an ensemble of ultracold triatomic molecules paves the way for simulating the three-body problem under quantum mechanics, and the obtained high phase space density also makes it possible to prepare Bose-Einstein condensates of triatomic molecules.
The reviewers of the “Science” magazine believe that this study is a milestone in the field of ultracold molecular research, opening up new directions for ultracold chemistry and quantum simulation research.
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