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Mixed-field effect at the hyperfine level of 127I79Br in its rovibronic ground state: Toward field manipulation of cold molecules |
| Zhengbin Bao(包正斌), Defu Wang(王得富), Xuping Shao(邵旭萍)†,Yunxia Huang(黄云霞), and Xiaohua Yang(杨晓华)‡ |
| School of Science, Nantong University, Nantong 226019, China |
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Abstract The mixed-field effect at the hyperfine level of the rovibronic ground state of the 127I79Br (X1Σ, v = 0, J = 0) molecule is computed on the J-I uncoupled basis of |JMJI1M1I2M2>, where J is the molecular total angular momentum excluding nuclear spin, MJ is the projection number of J, I1 and I2 are the nuclear spins of the iodine and bromine atoms, and M1 and M2 are the projection numbers of I1 and I2, respectively. When the two applied electric and magnetic fields are parallel, the perturbations are rare and only one perturbation is observed in a relatively large field regime in our computation range. However, when the two fields are off-parallel, the perturbations increase significantly and some sublevels show the Feshbach-like resonance phenomenon. Therefore, such sublevels transit between weak-field seeking and strong-field seeking repeatedly, which can be utilized to enhance or suppress cold molecular collision and chemical reaction rates. Such behavior of the molecular hyperfine structure in the mixed off-parallel fields may also be utilized to construct an electric-field-assisted anti-Helmholtz magnetic trap for cold molecules and to realize evaporative cooling of cold molecules (sub-mK) into the ultracold regime (μK).
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Received: 04 May 2023
Revised: 05 July 2023
Accepted manuscript online: 11 July 2023
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PACS:
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33.15.Pw
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(Fine and hyperfine structure)
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32.60.+i
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(Zeeman and Stark effects)
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37.10.Mn
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(Slowing and cooling of molecules)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No.12004199). |
Corresponding Authors:
Xuping Shao, Xiaohua Yang
E-mail: xuping1115@ntu.edu.cn;xhyang@ntu.edu.cn
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Cite this article:
Zhengbin Bao(包正斌), Defu Wang(王得富), Xuping Shao(邵旭萍),Yunxia Huang(黄云霞), and Xiaohua Yang(杨晓华) Mixed-field effect at the hyperfine level of 127I79Br in its rovibronic ground state: Toward field manipulation of cold molecules 2023 Chin. Phys. B 32 123302
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