中国物理B ›› 2019, Vol. 28 ›› Issue (3): 33401-033401.doi: 10.1088/1674-1056/28/3/033401

• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇    下一篇

Collision of cold CaF molecules: Towards evaporative cooling

Yuefeng Gu(顾跃凤), Yunxia Huang(黄云霞), Chuanliang Li(李传亮), Xiaohua Yang(杨晓华)   

  1. 1 School of Science, Nantong University, Nantong 226019, China;
    2 Department of Physics, School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China;
    3 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
  • 收稿日期:2018-11-14 修回日期:2018-12-18 出版日期:2019-03-05 发布日期:2019-03-05
  • 通讯作者: Xiaohua Yang E-mail:xhyang@ntu.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11604164 and U1810129), the Fund for Shanxi “1331 Project” Key Innovation Research Team, China (Grant No. 1331KIRT), and Excellent Youth Academic Leader in Higher Education of Shanxi Province, China (2018).

Collision of cold CaF molecules: Towards evaporative cooling

Yuefeng Gu(顾跃凤)1, Yunxia Huang(黄云霞)1, Chuanliang Li(李传亮)2, Xiaohua Yang(杨晓华)1,3   

  1. 1 School of Science, Nantong University, Nantong 226019, China;
    2 Department of Physics, School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China;
    3 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
  • Received:2018-11-14 Revised:2018-12-18 Online:2019-03-05 Published:2019-03-05
  • Contact: Xiaohua Yang E-mail:xhyang@ntu.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11604164 and U1810129), the Fund for Shanxi “1331 Project” Key Innovation Research Team, China (Grant No. 1331KIRT), and Excellent Youth Academic Leader in Higher Education of Shanxi Province, China (2018).

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摘要：

Long range intermolecular interaction potential surface of CaF (2Σ+) was simulated by employing the MOLPRO program and using the RCCSD(T)/def2-TZVP theory. The predicted data were further fitted to obtain the collision cross-section. The elastic collision cross-section of CaF at the temperature around 2 mK is as high as 6.5×10-9 cm2 and the collision rate is over 4.1×106 Hz. Additionally, we found that an orientation electric field will simplify the intermolecular interaction potential function from quaternary into ternary and the collision cross-section will be raised by about three orders. All-optical evaporative cooling of cold CaF is discussed in the conclusion.

关键词: intermolecular interaction potential energy surface, cold collision, evaporative cooling

Abstract:

Long range intermolecular interaction potential surface of CaF (2Σ+) was simulated by employing the MOLPRO program and using the RCCSD(T)/def2-TZVP theory. The predicted data were further fitted to obtain the collision cross-section. The elastic collision cross-section of CaF at the temperature around 2 mK is as high as 6.5×10-9 cm2 and the collision rate is over 4.1×106 Hz. Additionally, we found that an orientation electric field will simplify the intermolecular interaction potential function from quaternary into ternary and the collision cross-section will be raised by about three orders. All-optical evaporative cooling of cold CaF is discussed in the conclusion.

Key words: intermolecular interaction potential energy surface, cold collision, evaporative cooling

中图分类号:  (Interatomic and intermolecular potentials and forces, potential energy surfaces for collisions)

  • 34.20.-b
37.10.Mn (Slowing and cooling of molecules)